Patent Publication Number: US-6663933-B2

Title: Resin component

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a divisional application of U.S. application Ser. No. 09/984,272 filed Oct. 21, 2001 now issued as U.S. Pat. No. 6,503,352, which is a divisional application of U.S. application Ser. No. 09/460,989 filed Dec. 15, 1999 and now issued as U.S. Pat. No. 6,352,752, all of which are now incorporated herein by references. 
    
    
     BACKGROUND OF THE INVENTION 
     The present invention relates to a resin component formed by vibration welding together first and second molded bodies that are both molded from a synthetic resin. 
     Conventionally, the aforesaid resin component is known in, for instance, Japanese Patent Unexamined Publication No. Hei. 7-266425, and in the resin component disclosed therein, in order to prevent a damage to the commercial value of the resin component by burrs that are produced to be exposed from an external surface of the resin component when the fist and second molded bodies are vibration welded together, a flat joint area is provided on one of the two molded bodies, while provided on the other molded body are a welding projection adapted to be vibration welded to the joint area at a distal end thereof and a regulating projection disposed outwardly of the vibration welding portion and adapted to abut against the joint area when vibration welding of the vibration welding portion to the joint area is completed, so that burrs produced to project outwardly when the welding projection is vibration welded to the joint area are contained within a space formed between the welding projection and the regulating projection to thereby be prevented from exposure to the outside. 
     In the above-described conventional resin component, since there exists a gap between the regulating projection and the joint area before the vibration welding is completed, burrs produced in conjunction with vibration welding of the welding projection to the joint area before the vibration welding is completed are guided by the flat guide surface to be exposed to the outside through the gap, this leading to a possibility that the burrs are exposed to the outside or held between the regulating projection and the joint area after the vibration welding is completed, thus it being not possible to securely prevent the exposure of the burrs to the outside. 
     SUMMARY OF THE INVENTION 
     The present invention was made in view of the problem described above, and an object thereof is to provide a resin component in which exposure of burrs produced when first and second molded bodies are vibration welded to the outside is securely be prevented to thereby improve the commercial value of the resin component. 
     The above-mentioned object can be achieved by a resin component according to the present invention comprising a first synthetic resin molded body and a second synthetic resin molded body coupled with the first synthetic resin molded body by a vibration welding. The first resin molded body includes an joint area which is provided at its edge portion where the first molded body is joined to the second molded body, a first regulating projection which is provided from an outermost edge of the joint area toward the second molded body, and a first guide surface connecting an internal side surface of the first regulating projection to the joint area. The second resin molded body includes a welding projection which is projected toward the first molded body so as to be welded at a distal end thereof to the joint area of the first molded body and is provided at its edge portion where the second molded body is jointed to the first molded body, a second regulating projection which is projected from an outermost edge of the second molded body toward the first molded body so as to closely confront the first regulating projection after a vibration welding operation between the welding projection and the joint area is completed, and a second guide surface connecting an external side surface of the welding projection to an internal side surface of the second regulating projection. 
     In the resin component according to the present invention, it is preferable that the first guide surface is formed into a curve shape to guide a burr produced to project toward the first regulating projection as a result of vibration welding of the welding projection to the joint area toward the internal side surface of the second regulating projection along the internal side surface of the first regulating projection, and the second guide surface is curved and located in confront with the first guide surface so as to guide the burr guided from the internal side surface of the first regulating projection to the internal side surface of the second regulating projection toward the external side surface of the welding projection. 
     In addition, in the resin component according to the present invention, it is also preferable that each of the joint area, the first regulating projection, the welding projection and the second regulating projection is formed into an endless shape. 
     Further, in the resin component according to the present invention, it is advantageous that the distal end of the welding projection has a cross section substantially formed by two line one of which is inclined relative to a direction extended perpendicular to the joint area by a first predetermined angle (α) and the other of which is extended along or inclined relative to the direction by a second predetermined angle (β) smaller than the first predetermined angle. 
     Moreover, in order to attaining the above object, according to the present invention, there is provided a resin component formed by vibration welding together first and second molded bodies that are molded from a synthetic resin, wherein there are provided at an edge portion of the first molded body where the first molded body is joined to the second molded body an endless joint area, a first endless regulating projection projecting from an outer edge of the joint area toward the second molded body and a first guide surface connecting an internal side surface of the first regulating projection to the joint area, wherein there are provided at an edge portion of the second molded body where the second molded body is jointed to the first molded body, an endless welding projection projecting toward the first molded body in such a manner as to be welded at a distal end thereof to the joint area of the first molded body, a second endless regulating projection projecting from an outer edge of the second molded body toward the first molded body in such a manner as to closely confront the first regulating projection when vibration welding of the welding projection to the joint area is completed and a second guide surface connecting an external side surface of the welding projection to an internal side surface of the second regulating projection, the first guide surface being curved convexedly outwardly in such a manner as to guide a burr produced to project toward the first regulating projection as a result of vibration welding of the welding projection to the joint area toward the internal side surface of the regulating projection along the internal side surface of the first regulating projection, and the second guide surface being curved convexedly to a side opposite to the first guide surface in such a manner as to guide the burr guided from the internal side surface of the first regulating projection to the internal side surface of the second regulating projection toward the external side surface of the welding projection. 
     According to the above construction, the first and second molded bodies are vibrated relative to each other at a high speed with the distal end of the welding projection of the second molded body being pressed against the joint area of the first molded body, whereby the distal end of the welding projection is vibration welded to the joint area by a friction heat produced between the distal end of the welding projection and the joine area to thereby construct the resin component. Of burrs produced at a contact portion between the distal end of the welding projection and the joint area during this vibration welding, those projecting outwardly are guided by the first guide surface along the internal side surface of the first regulating projection toward the second regulating projection, and furthermore burrs guided from the internal side surface of the first regulating projection to the internal side surface of the second regulating projection are then guided toward the external side surface of the welding projection by the second guide surface, and therefore the burrs are prevented from project outwardly from the gap between the first and second regulating projections and instead they are destined to be confined within the space formed by the joint area, the first regulating projection, the second regulating projection and the welding projection, whereby exposure of the burrs from the external surface of the resin component is securely prevented, this thereby contributing to the improvement of the commercial value of the resin component so formed. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 shows a brake fluid pressure circuit diagram of a brake system for a passenger vehicle; 
     FIG. 2 shows a side view of the brake fluid pressure control device; 
     FIG. 3 shows a view seen in a direction indicated by an arrow  3  in FIG. 2; 
     FIG. 4 shows a view seen in a direction indicated by an arrow  4  in FIG. 2; 
     FIG. 5 shows a sectional view taken along the line  5 — 5  of FIG. 4; 
     FIG. 6 shows a sectional view taken along the line  6 — 6  of FIG. 4; 
     FIG. 7 shows a sectional view taken along the line  7 — 7  of FIG. 6; 
     FIG. 8 shows a vertical sectional view showing a main part of a cover before constituent parts of the cover have not yet been welded together; and 
     FIG. 9 shows a sectional view of the cover after welding corresponding to FIG.  8 . 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A mode of carrying out the present invention will be described below based on an embodiment according to the present invention shown in the accompanying drawings. 
     FIGS. 1 to  9  shown an embodiment of the present invention, in which FIG. 1 is a brake fluid pressure circuit diagram of a brake system for a passenger vehicle, FIG. 2 a side view of a brake fluid pressure control device, FIG. 3 a view seen in a direction indicated by an arrow  3  in FIG. 2, FIG. 4 a view seen in a direction indicated by an arrow  4  in FIG. 2, FIG. 5 a sectional view taken along the line  5 — 5  in FIG. 4, FIG. 6 a sectional view taken along the line  6 — 6  in FIG. 4, FIG. 7 a sectional view taken along the line  7 — 7 , FIG. 8 an enlarged vertical sectional view of a main part of a cover before parts of the cover are welded together, and FIG. 9 a sectional view corresponding to FIG. 8 showing the cover after the parts have been welded together. 
     First of all, in FIG. 1, a tandem-type master cylinder M comprises first and second output ports  1   1 ,  1   2  for generating a brake fluid pressure in response to a pedal pressing force applied by the driver to a brake pedal P, a brake fluid pressure control device  3  provided between a front left wheel brake B 1 , a rear right wheel brake B 2 , a front right wheel brake B 3  and a rear left wheel brake B 4  and first and second output fluid pressure passages  2   1 ,  2   2  connected individually to the first and second output ports  1   1 ,  1   2 , and first and second proportional pressure reduction valves  4   1 ,  4   2  interposed between the brake fluid pressure control device  3  and the rear left and right wheel brakes B 2 , B 4 , respectively. 
     The brake fluid pressure control device  3  comprises first, second, third and fourth normally opened electromagnetic valves  5   1  to  5   4  disposed so as to correspond individually to the front left wheel brake B 1 , rear right wheel brake B 2 , front right wheel brake B 3  and rear left wheel brake B 4 , first, second, third and fourth check valves  7   1  to  7   4  connected, respectively, in parallel to the normally opened electromagnetic valves  5   1  to  5   4 , first, second, third and fourth normally closed electromagnetic valves  6   1  to  6   4  disposed so as to correspond individually to the respective wheel brakes B 1  to B 4 , first and second reservoirs  8   1 ,  8   2  disposed so as to correspond individually to the first and second output fluid pressure passages  2   1 ,  2   2 , first and second plunger-type pumps  11   1 ,  11   2  connected, respectively, to the first and second reservoirs  8   1 ,  8   2  via intake valves  10   1 ,  10   2 , a single common electric motor  12  for driving both of the pumps  11   1 ,  11   2 , first and second dampers  14   1 ,  14   2  connected, respectively, to the first and second pumps  11   1 ,  11   2  via discharge valves  13   1 ,  13   2 , first and second orifices  15   1 ,  15   2  disposed, respectively, between the first and second dampers  14   1 ,  14   2  and the first and second output fluid pressure passages  2   1 ,  2   2  and an electronic control unit  16  for controlling operations of the respective normally opened electromagnetic valves  5   1  to  5   4 , the respective normally closed electromagnetic valves  6   1  to  6   4  and the electric motor. 
     The first normally opened electromagnetic valve  5   1  is provided between the first output fluid pressure passage  2   1  and the front left wheel brake B 1 , the second normally opened electromagnetic valve  5   2  between the first output fluid pressure passage  2   1  and the first proportional pressure reduction valve  4   1 , the third normally opened electromagnetic valve  5   3  between the second output fluid pressure passage  2   2  and the front right wheel brake B 3 , and the fourth normally opened electromagnetic valve  5   4  between the second output fluid pressure passage  2   2  and the second proportional pressure reduction valve  4   2 . 
     In addition, the first to fourth check valves  7   1  to  7   4  are connected, respectively, in parallel to the normally opened electromagnetic valves  5   1  to  5   4  in such a manner as to allow flows of brake fluid from the corresponding wheel brakes B 1  to B 4  to the master cylinder M. 
     The first normally closed electromagnetic valve  6   1  is provided between the front left wheel brake B 1  and the first reservoir  8   1 , the second normally closed electromagnetic valve  6   2  between the first proportional pressure reduction valve  4   1  and the first reservoir  8   1 , the third normally closed electromagnetic valve  6   3  between the front right wheel brake B 3  and the second reservoir  8   2 , and the fourth normally closed electromagnetic valve  6   4  between the second proportional pressure reduction valve  4   2  and the second reservoir  8   2 . 
     Now, the first normally opened electromagnetic valve  5   1  cooperates with the first normally closed electromagnetic valve  6   1  to constitute a first control valve means V 1 , the second normally opened electromagnetic valve  5   2  with the second normally closed electromagnetic valve  6   2  to constitute a second control valve means V 2 , the third normally opened electromagnetic valve  5   3  with the third normally closed electromagnetic vale  6   3  to constitute a third control valve means V 3 , and the fourth normally opened electromagnetic valve  5   4  with the fourth normally closed electromagnetic valve  6   4  to constitute a fourth control valve means V 4 . 
     The control valves V 1  to V 4  constructed as described above are controlled by the electronic control unit  16  so as to establish communications between the master cylinder M and the wheel brakes B 1  to B 4  and to close communications between the wheel brakes B 1  to B 4  and the reservoirs  8   1 ,  8   2  during a normal braking operation in which there is no possibility that the respective wheels are locked. In other words, the respective normally opened electromagnetic valves  5   1  to  5   4  are deenergized to be kept in opened conditions and the respective normally closed electromagnetic valves  6   1  to  6   4  are also deenergized to be kept in closed conditions, and a brake fluid pressure outputted from the first output port  11  of the master cylinder M is applied to the front left wheel brake B 1  via the normally opened electromagnetic valve  5   1  and also to the rear right wheel brake B 2  via the second normally opened electromagnetic valve  5   2  and the first proportional pressure reduction valve  4   1 . In addition, a brake fluid pressure outputted from the second output port  1   2  of the master cylinder M is applied to the front right wheel brake B 3  via the third normally opened electromagnetic valve  5   3  and also to the rear left wheel brake B 4  via the fourth normally opened electromagnetic valve  5   4  and the second proportional pressure reduction valve  4   2 . 
     When any of the wheels is about to be locked during the above braking operation, of the control valve means V 1  to V 4  the control valve means corresponding the wheel which is about to be locked is controlled by the electronic control unit  16  so as to close communications between the master cylinder M and the wheel brakes B 1  to B 4  and to establish communications between the wheel brakes B 1  to B 4  and the reservoirs  8   1 ,  8   2 . In other words, of the first to fourth normally opened electromagnetic valves  5   1  to  5   4 , the normally opened electromagnetic valve corresponding to the wheel which is about to enter into a locked condition is energized to be closed, while of the first to fourth normally closed electromagnetic valves  6   1  to  6   4  the normally closed electromagnetic valve corresponding to the wheel in question is energized to be opened, whereby a part of the brake fluid pressure of the wheel which is about to enter into the locked condition is absorbed by either the first reservoir  8   1  or the second reservoir  8   2 , the brake fluid pressure of the wheel which is about to enter into the locked condition being thereby reduced. 
     In trying to hold the brake fluid pressures constant, the respective control valves V 1  to V 4  are controlled by the electronic control unit  16  such that the wheel brakes B 1  to B 4  are cut off from the master cylinder M and the reservoirs  8   1 ,  8   2 . In other words, the normally opened electromagnetic valves  5   1  to  5   4  are energized to be closed while the normally closed electromagnetic valves  6   1  to  6   4  are deenergized to be kept closed. Furthermore, in trying to boost the brake fluid pressures, the normally opened electromagnetic valves  5   1  to  5   4  are deenergized to be kept opened and the normally closed electromagnetic valves  6   1  to  6   4  are deenergized to be kept closed. 
     Thus, efficient braking becomes possible without locking the wheels by controlling the respective control valves V 1  to V 4  by the electronic control unit  16  as described above. 
     The electric motor  12  is caused to operate by the electronic control unit  16  during an anti-locking control as described above. In conjunction with the operation of the electric motor  12 , the first and second pumps  11   1 ,  11   2  are driven, and therefore brake fluid absorbed in the first and second reservoirs  8   1 ,  8   2  is taken into the first and second pumps  11   1 ,  11   2 , is then discharged toward the first and second dampers  14   1 ,  14   2  and is eventually refluxed to the first and second output fluid pressure passages  2   1 ,  2   2  via the first and second orifices  15   1 ,  15   2 . By a reflux of brake fluid like this an increase in travel of the brake pedal P due to absorption of brake fluid by the first and second reservoirs  8   1 ,  8   2  when the brake pedal P is pressed down can be prevented. Moreover, pulsations generated by the discharge pressures of the first and second pumps  11   1 ,  11   2  are absorbed by a cooperation between the first and second dampers  14   1 ,  14   2  and the first and second orifices  15   1 ,  15   2 , and therefore there is no risk of the brake pedal operation feeling being deteriorated. 
     In FIGS. 2 to  4 , the brake fluid pressure control device  3  comprises a housing  20  formed of an aluminum alloy or the like into a block-like configuration, and provided in this housing  20  are the first to fourth normally opened electromagnetic valves  5   1  to  5   4 , the first to fourth normally closed electromagnetic valves  6   1  to  6   4  which constitute together with the first to fourth normally opened electromagnetic valves  5   1  to  5   4  the control valve means V 1  to V 4 , the first and fourth check valves  7   1  to  7   4 , the first and second reservoirs  8   1 ,  8   2 , the first and second dampers  14   1 ,  14   2 , the first and second orifices  15   1 ,  15   2 , and the first and second pumps  11   1 ,  11   2 . In addition, a cover  21  as a resin component is attached to one end surface  20   a  of the housing  20  and a motor case  22  for the electric motor  12  is attached to the other end surface  20   b  of the housing  20  which is opposite to the end where the cover  21  is provided. 
     Referring to FIGS. 5 to  7  together, the first to fourth electromagnetic valves  5   1  to  5   4  each comprise a valve portion Sa and a solenoid portion  5   b  provided continuously with the valve portion  5   a , and the respective valve portions  5   a  . . . are received in four mounting holes  23  . . . formed in an upper portion of the housing  20  in such a manner as to open in the one end surface  20   a  of the housing  20 , and the respective solenoid portions  5   b  . . . protrude from the one end surface  20   a  of the housing  20 . In addition, the first to fourth normally closed electromagnetic valves  6   1  to  6   4  each comprise a valve portion  6   a  and a solenoid portion  6   b  provided continuously with the valve portion  6   a , and the respective valve portions  6   a  . . . are received in four mounting holes  24  formed in an upper portion of the housing in such a manner as to open in the one end surface  20   a  of the housing  20 , and the solenoid portions  6   b  . . . protrude from the one end surface  20   a  of the housing  20 . The mounting holes  23  . . . are formed in the housing  20  in such a manner as to align in a transverse direction, and the mounting holes  24  . . . are formed below the mounting holes  23  in such a manner as to align in the transverse direction. Thus, the first to fourth normally opened electromagnetic valves  5   1  to  5   4  and the first to fourth normally closed electromagnetic valves  6   1  to  6   4  are mounted in the housing  20  in vertically parallel to each other. 
     The first reservoir  8   1  is disposed at a lower portion of the housing  20  at a position corresponding to the control valve means V 1 , V 2  and the second reservoir  8   2  is disposed at a lower portion of the housing  20  at a position corresponding to the control valve means V 3 , V 4 . Thus, as shown in FIG. 5, two reservoirs  8   1 ,  8   2  each comprise a bottomed reservoir hole  26  formed in the housing  20  in such a manner as to open in the one end surface  20   a  of the housing  20 , a bottomed cylindrical piston  28  forming a reservoir chamber  27  between a closed end of the reservoir hole  26  and itself and slidably fitted in the reservoir hole  26 , a receiver member  29  fitted in an open end portion of the reservoir hole  26 , a stop ring  30  attached to an edge of the open end for preventing the receiver member  29  from coming off the reservoir hole  26  and a reservoir spring  31  provided as compressed between the receiver member  29  and the piston  28 , the reservoir chambers  27  of the two reservoirs  8   1 ,  8   2  being connected, respectively, to the first and second pumps  11   1 ,  11   2 . 
     The first damper  14   1  is disposed in the housing  20  at position corresponding to the control valve means V 1 , V 2  and the first reservoir  8   1  and the second damper  14   2  is disposed in the housing at a position corresponding to the control valve means V 3 , V 4  and the second reservoir  8   2 . 
     The two dampers  14   1 ,  14   2  each comprise a piston  35  slidably fitted in a bottomed damper hole  33  formed in the housing in such a manner as to open in the one end surface  20   a  of the housing so as to form a damper chamber  34  between a closed end of the damper hole  33  and itself, a receiver member  36  fitted in an open end portion of the damper hole  33 , a stop ring  37  attached to an edge of the open end portion of the damper hole  33  for preventing the receiver member  36  from coming off the damper hole  33 , and one or a plurality of coned disc springs  38  provided as a spring means between the receiver member  36  and the piston  35 , the damper chambers  34  . . . of the two dampers  14   1 ,  14   2  being connected to the first and second pumps  11   1 ,  11   2 . 
     The first and second pumps  11   1 ,  11   2  are disposed in the housing  20 , respectively, between the first to fourth normally closed electromagnetic valves  6   1  to  6   4  and the first and second reservoirs  8   1 ,  8   2  and each have a coaxial operating axis oriented along a direction in which the first to fourth normally closed electromagnetic valves  61  to  64  are arranged, and plungers  40  . . . provided with the respective pumps  11   1 ,  11   2  are disposed at positions that are spaced away from each other. In addition, the two pumps  11   1 ,  11   2  each incorporate therein an intake valve  10   1 ,  10   2  and a discharge valve  13   1 ,  13   2 . 
     The motor case  22  for the electric motor  12  comprises a bottomed cylindrical case main body  22   a  and a lid body  22   b  disposed so as to close an open end of the case main body  22   a , and the case main body  22   a  and the lid body  22   b  are both fastened to the other end surface  20   b  o the housing  20  with a plurality of screw members  41  . . . An output shaft of the electric motor  12  rotatably penetrates the lid body  22   b  and extends into a recessed portion  43  formed in the housing  20 . The output shaft is supported on a ball bearing  44  held on the lid body  22   b  and a ball bearing  45  held on an inner end portion of the recessed portion  43 . In addition, an eccentric shaft portion  42   a  is provided on the output shaft  42  at an intermediate portion positioned between the two bearings  44 ,  45 , and a ball bearing  46  mounted around an outer circumference of the eccentric shaft portion  42   a  abuts with distal ends of the respective plungers  40  . . . of the first and second pumps  11   1 ,  11   2 . Therefore, when the output shaft  42  is rotated through operation of the electric motor  12 , eccentric motions are imparted to the ball bearing  46  via the eccentric shaft portion  42   a , whereby the respective plungers  40  . . . perform pumping operations. 
     In FIG. 8, the cover  21  comprises a first molded body  61  formed into a cylindrical configuration from a synthetic resin and a second molded body  62  formed from a synthetic resin into a configuration allowing closure of an opening portion of the first molded body  61  formed at one end thereof and vibration welded to the first molded body  61  at the one end thereof. 
     Referring also to FIG. 9, provided at the end portion where the first molded body  61  is joined to the second molded body  62  an endless flat joint area  63 , a first endless regulating projection  64  projecting from an outer edge of the joint area  63  toward the second molded body  62  and a first guide surface  65  connecting an internal side surface of the first regulating projection  64  to the joint area  63 . 
     In addition, provided on an end portion of the second molded body  62  where the second molded body  62  is joined to the first molded body  61  an endless welding projection  66  projecting toward the first molded body  61  in such a manner that a distal end portion thereof is welded to the joint area  63  of the first molded body  61 , a second regulating projection  67  projecting from an outer edge of the second molded body  62  toward the first molded body in such a manner as to closely confront the first regulating projection  64  of the first molded body  61  when vibration molding of the welding projection  66  to the joint area  63  is completed, and a second guide surface  68  connecting an external side surface of the welding projection  66  to an internal side surface of the second regulating projection  67 . 
     Note that the distal end of the welding projection  66  has a cross section substantially formed by two lines x, y one of which is inclined relative to a direction z extended perpendicular to the joint area by a first predetermined angle (α) and the other of which is extended along or inclined relative to the direction by a second predetermined angle (β) smaller than the first predetermined angle. Although in the embodiment the second predetermined angle (β) is made about 0 degree or more, it is possible to modify it into a minus degree. Note that it is advantageous that the second predetermined angle (β) is set to be about 0 degree, because the burrs can be moved and exposed towards the outside most effectively. 
     Moreover, the first guide surface  65  is formed as a curved surface which is curved outwardly convexedly in such a manner as to guide a burr produced to project toward the first regulating projection  64  as indicated by an arrow in FIG. 9 as a result of vibration welding of the welding projection  66  to the joint area  63  toward the internal side surface of the regulating projection  67  along the internal side surface of the first regulating projection  64 . In addition, the second guide surface  68  is formed as a curved surface which is curved convexedly to a side opposite to the first guide surface  65  in such a manner as to guide the burr guided from the internal side surface of the first regulating projection  64  to the internal side surface of the second regulating projection  67  toward the external side surface of the welding projection  66 . 
     The cover  21  formed as described above is then fastened to the one end surface  20   a  of the housing with a plurality of screw members  49  . . . in such a manner as to allow not only accommodation therein of the solenoid portions  5   a  . . . of the first to fourth normally opened electromagnetic valves  5   1  to  5   4  and the solenoid portions  6   b  . . . of the first to fourth normally closed electromagnetic valves  6   1  to  6   4  but also formation between the housing  20  and itself of an accommodation chamber  48  to which the receiver members  29  . . . of the first and second reservoirs  8   1 ,  8   2  and the receiver members  36  . . . of the first and second dampers  14   1 ,  14   2  are caused to face. Then, an endless seal member  71  adapted to be brought into spring contact with the one end surface  20   a  of the housing  20  is mounted on an housing side  20  edge of the cover  21 , in other words, the first molded body  61 . 
     Provided in the first molded body  61  of the cover  21  is a support portion  50  in which the respective solenoid portions  5   b  . . . of the first to fourth normally opened electromagnetic valves  5   1  to  5   4  and the respective solenoid portions  6   b  . . . of the first to fourth normally closed electromagnetic valves  6   1  to  6   4  are fitted for support thereat, and a plurality of opening portions  52  are formed in the support portion  50  so as not to partition the accommodation chamber  48  with the support portion  50 . 
     The electronic control unit  16  comprises a printed circuit board  53  having printed thereon an electric circuit and a semiconductor chip  54  installed thereon and the printed circuit board  53  is fastened to the support portion  50  on a side opposite to the housing  20  within the cover  21 . Moreover, a plurality of conductive metallic bus bars  51  . . . are embedded in the support portion  50 , and with these bus bars  51  . . . the respective solenoid portions  5   b  . . . of the first to fourth normally opened electromagnetic valves  5   1  to  5   4  and the respective solenoid portions  6   b  . . . of the first to fourth normally closed electromagnetic valves  6   1  to  6   4  are connected to the electronic control unit  16 . 
     An projecting portion  21   a  projecting sideward from the housing  20  is formed integrally with the cover  21 , and a male-type cover side connector  55  is provided in the projecting portion  21   a.    
     This cover side connector  55  comprises a connector housing  56  formed into a box-like configuration integrally with the projecting portion  21   a  of the cover  21  and a plurality of connector terminals  57  . . . accommodated and supported in the interior of the connector housing  56 , and the connector terminals  57  . . . are connected respectively to the respective solenoid portions  5   b  . . . ,  6   b  . . . via the electronic control unit  16  and the bus bars  51  and they are also connected to the electric motor  12  via the electronic control unit  16  and an conductive body not shown. 
     Detachably connected to the cover side connector  55  provided continuously with the cover  21  is a connector housing  77  of an external conductor side connector  76  commonly provided at an end of a plurality of external conductors  75 ,  75  . . . and connector terminals (not shown) provided in the connector housing  77  in such a manner as to be individually continuous with the external conductors  75 ,  75  . . . are fitted in the connector terminals  57  of the cover side connector  55  for connection therewith. 
     Paying attention to FIGS. 2 and 3, fixed to a vehicle body frame  88  is a bracket  89  comprising a support plate portion  89   a  confronting a lower surface of the housing  20  and a pair of support plate portions  89   b ,  89   b  provided at ends of the support plate portion  89   a  continuously therewith at right angles so as to confront side surfaces of the housing  20 . 
     On the other hand, mounting projections  102 ,  102  are provided at upper portions on sides of the housing  20  integrally therewith in such a manner as to project therefrom and both the mounting projections  102 ,  102  are mounted at upper portions of the support plate portions  89   b ,  89   b  of the bracket  89  via mounting means  91 ,  91 . 
     The mounting means  91  comprises a mount bolt  103  having an axis extending substantially horizontally and supported on the support portion  89   b  and a cylindrical mount rubber  104  for allowing a part of the mount bolt  3  to be fitted thereinto, and there is provided in the mounting projection  102  a bottomed mounting hole  105  into which the mount rubber  104  is fitted. 
     The mount bolt  103  comprises integrally a threaded shaft portion  103   a , a fitting shank portion  103   b  provided coaxially and integrally with the threaded shaft portion  103   a  to be continuous therewith and a jaw portion  103   c  projecting radially outwardly from a portion where the threaded shaft portion  103   a  and the fitting shank portion  103   b  are continuously provided. On the other hand, a slit  106  made open upwardly is provided at an upper portion of the support plate  89   b  and a portion of the threaded shaft portion  103   a  which is closer to the jaw portion  103   c  is inserted into the slit  106  from above. Then, a nut  107  is screwed on the threaded shaft portion  103   a  and the support plate portion  89   b  is held between the nut  107  and the jaw portion  103   c , whereby the mount bolt  103  is fixedly supported on the support plate portion  89   b.    
     In addition, a lower portion of the housing  20  is constructed to be mounted on the support plate portion  89   a  of the bracket  89  via a mounting means  90 , and this mounting means  90  comprises a mount rubber (not shown) fitted in the lower portion of the housing  20 , which mount rubber is fixed to the support plate portion  89   a.    
     Next, an operation of the embodiment will be described. The housing  21  is constructed to be formed by vibrating both the molded bodies  61 ,  62  relative to each other at a high speed with the welding projection  66  of the second molded body  62  being pressed against the joint area  63  of the first molded body  61  at the distal end thereof, whereby the distal end of the welding projection  66  is vibration welded on the joint area  63  by virtue of a friction heat generated between the distal end of the welding projection  66  and the joint area  63 . The burrs produced between the distal end of the welding projection  66  and a contact portion of the joint area  63  during the vibration welding those projecting outwardly are constructed to be guided by the first guide surface  65  toward the second regulating projection  67  along the internal side surface of the first regulating projection  64 . In addition, the burrs guided from the internal side surface of the first regulating projection  64  toward the internal side surface of the second regulating projection  67  are guided by the second guide surface  68  toward the external side surface of the welding projection  66 . 
     Consequently, this serves to avoid a risk of the burrs being allowed to project outwardly from a gap between the first and second regulating projections  64 ,  67 , and the burrs are confined within a space formed by the joint area  63 , the first regulating projection  64 , the second regulating projection  67  and the welding projection  66 , whereby a risk of burrs being exposed from the external surface of the cover  21  is securely prevented, this contributing to improvement of the commercial value of the cover  21 . 
     Thus, the embodiment of the present invention has been described in detail heretofore, but the present invention is not limited to the above embodiment but may be modified variously without departing the spirit of the present invention which is clearly defined by the range of what is claimed at the beginning of this document. 
     For instance, although in the above case the present invention is described as being applied to the cover  21  of the brake fluid pressure control device for a passenger vehicle, the present invention is not limited to a cover  21  of that type but may be widely applied to a resin component of any type constructed to be formed by vibration welding first and second molded bodies which are formed from a synthetic resin. 
     While there has been described in connection with the preferred embodiment of the invention, it will be obvious to those skilled in the art that various changes and modifications may be made therein without departing from the invention, and it is aimed, therefore, to cover in the appended claim all such changes and modifications as fall within the true spirit and scope of the invention. 
     As is described above, according to the present invention, of burrs produced between the distal end of the welding projection and the contact portion of the joint area during the vibration welding the first and second molded bodies those projecting outwardly are constructed to be guided by the first guide surface toward the second regulating projection along the internal side surface of the first regulating projection, and therefore a risk can be avoided in which the burrs are allowed to project outwardly from the gap between the first and second regulating projections, and the burrs so guided are eventually confined within the space formed by the joint area, the first regulating projection, the second regulating projection and the welding projection, whereby a risk of burrs being exposed from the external surface of the resin component is securely prevented, this contributing to improvement of the commercial value of the resin component.