Patent Publication Number: US-11655623-B2

Title: Nozzle for sanitary cleaning device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the priority of Japanese Patent Application No. 2020-011117, filed Jan. 27, 2020, the entire contents of which are incorporated herein by reference. 
     FIELD OF THE DISCLOSURE 
     The present disclosure relates to a nozzle for a sanitary cleaning device. 
     BACKGROUND OF THE DISCLOSURE 
     Nozzles for sanitary cleaning devices have been known. A known nozzle includes a cylindrical nozzle cover having a nozzle cover-side water ejection opening, and a channel forming member disposed in the nozzle cover and having a channel-side water ejection opening (see, for example, Patent Document 1). In a state where the nozzle cover has the channel-forming member disposed therein, the nozzle cover-side water ejection opening of the nozzle cover and the channel-side water ejection opening of the channel-forming member may need to communicate with each other while coinciding in position with each other in the axial direction of the nozzle cover. Accordingly, highly precise positioning is required. 
     Patent Document 1: Japanese Unexamined Patent Application, Publication No. 2003-278248 
     SUMMARY OF THE DISCLOSURE 
     If a nozzle cover is made of ceramic, the nozzle cover is likely to have dimensional deviations caused by the manufacturing process. When the channel-forming member is arranged in the nozzle cover, such a dimensional deviation in the axial dimension of the nozzle cover may make it difficult to perform positioning of the channel-forming member in the axial direction. 
     It is an object of the present disclosure to provide a nozzle for a sanitary cleaning device, the nozzle including a ceramic nozzle cover and a channel-forming member which is disposed in the nozzle cover, and positioning of which can be easily performed in the axial direction even if the nozzle cover has a dimensional deviation in the axial direction. 
     An aspect of the present disclosure is directed to a nozzle for a sanitary cleaning device. The nozzle includes: a nozzle cover made of ceramic and having a nozzle cover-side water ejection opening; a distal-side channel-forming component disposed in the nozzle cover and having a channel-side water ejection opening which communicates with the nozzle cover-side water ejection opening; and a rear-side channel-forming component connected to a rear portion of the distal-side channel-forming component in an axial direction of the nozzle cover, and capable of being adjusted in position in the axial direction of the nozzle cover with respect to the distal-side channel-forming component. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
         FIG.  1    is a perspective view of a toilet apparatus mounted with a nozzle of a first embodiment; 
         FIG.  2 A  is a perspective view of the nozzle and a nozzle support, as viewed from a distal end; 
         FIG.  2 B  is a perspective view of the nozzle and the nozzle support, as viewed from a proximal end; 
         FIG.  3    is a cross-sectional view taken along line A-A in  FIG.  2 A ; 
         FIG.  4    is a cross-sectional view of the nozzle support; 
         FIG.  5    is a cross-sectional view of the nozzle; 
         FIG.  6    is an exploded perspective view of the nozzle, as viewed obliquely from above; 
         FIG.  7    is an exploded perspective view of the nozzle, as viewed obliquely from below; 
         FIG.  8 A  is a diagram showing a step of a process of assembling the nozzle, in which an ejection-side channel-forming component is being inserted into a nozzle cover; 
         FIG.  8 B  is a diagram showing a step of the process of assembling the nozzle, in which the ejection-side channel-forming component has been moved to be disposed adjacent to an upper side; 
         FIG.  8 C  is a diagram showing a step of the process of assembling the nozzle, in which an introduction-side channel-forming component is being inserted into the nozzle cover; 
         FIG.  8 D  is a diagram showing a step of the process of assembling the nozzle, in which the ejection side channel-forming component and the introduction-side channel-forming component have been inserted into the nozzle cover; 
         FIG.  9    is a diagram showing a nozzle of a second embodiment; and 
         FIG.  10    is an exploded perspective view of the nozzle of the second embodiment, as viewed obliquely from above. 
     
    
    
     DETAILED DESCRIPTION OF THE DISCLOSURE 
     A toilet apparatus  10  provided with a sanitary cleaning device  1  that includes a nozzle  2  of a first embodiment will be described with reference to the accompanying drawings. In the following description, the words, such as “front”, “forward”, “rear” and “rearward”, refer to the respective direction as viewed from a user seated on a toilet seat  12 . As shown in  FIG.  1   , the sanitary cleaning device  1  of the present embodiment is mounted to the toilet apparatus  10 . The toilet apparatus  10  includes a toilet bowl  11 , the toilet seat  12 , a toilet lid  13 , a functional unit  14 , and an operation panel  15 . 
     The toilet bowl  11  has an opening facing upward, and is made of, for example, ceramic. The toilet seat  12  and the toilet lid  13  are attached to a front portion of the functional unit  14  such that the toilet seat  12  and the toilet lid  13  are pivotable with respect to the toilet bowl  11 . The toilet seat  12  is a part on which a user is seated. The toilet seat  12  is placed on the rim of the opening of the toilet bowl  11 . The toilet seat  12  has a ring shape. The toilet lid  13  covers the opening of the toilet bowl  11  and the opening of the toilet seat  12  in an openable/closable manner. The functional unit  14  has the toilet seat  12  and the toilet lid  13  attached thereto, and the sanitary cleaning device  1  installed thereon. 
     The operation panel  15  extends from the functional unit  14  and disposed on a side of the toilet seat  12  adjacent to the functional unit  14 . The operation panel  15  is operable to flush the toilet bowl  11 , to cause the sanitary cleaning device  1  to perform a cleaning, and to select cleaning modes of the sanitary cleaning device  1 . 
     The sanitary cleaning device  1  is configured to wash the private parts of a person. The sanitary cleaning device  1  is disposed in a rearward area in the opening of the toilet seat  12  and on the front end side of the functional unit  14 . As shown in  FIGS.  2 A and  2 B , the sanitary cleaning device  1  includes the nozzle  2  that is configured to eject cleaning water, and a nozzle support  5  that supports the nozzle  2  in an extendable/retractable manner. The nozzle  2  is for use in the sanitary cleaning device  1 . The nozzle  2  is usable for cleaning the genital and anal area of a person. 
     The nozzle support  5  supports the proximal end of the nozzle  2 . As shown in  FIG.  3   , the nozzle support  5  has a cleaning water introduction pipe  51 , a nozzle mount  52 , and a rear slidable part  53 . The nozzle mount  52  has a small-diameter mount part  521  and a large-diameter rear part  522 . 
     As shown in  FIG.  3   , the small-diameter mount part  521  constitutes a distal end portion of the nozzle support  5 , and has a cylindrical shape. As shown in  FIG.  4   , the small-diameter mount part  521  has a fitting protrusion  521   b  on its outer peripheral surface. The fitting protrusion  521   b  is configured to fit in a nozzle-side fitting recess  21  of the nozzle  2  (see  FIG.  5   ). An O-ring  521 C is attached to the outer peripheral surface of the small-diameter mount part  521 . 
     As shown in  FIG.  4   , the cleaning water introduction pipe  51  passes through the small-diameter mount part  521  to extend along the inner peripheral surface of the small-diameter mount part  521 . The inner peripheral surface of the small-diameter mount part  521  has a plurality of ribs  521   a  formed thereon. The plurality of ribs  521   a  are spaced apart from each other in the circumferential direction and extend in the axial direction. In a state where the cleaning water introduction pipe  51  has been fitted along the inner peripheral surface of the small-diameter mount part  521 , the plurality of ribs  521   a  are in contact with the outer peripheral surface of the cleaning water introduction pipe  51 . As the result, intra-support gap channels Fa through which cleaning water flows are formed between the outer peripheral surface of the cleaning water introduction pipe  51  and the inner peripheral surface of the small-diameter mount part  521 . 
     The cleaning water introduction pipe  51  has a cylindrical shape extending in the axial direction of the nozzle  2 . The cleaning water introduction pipe  51  has an axial rear end portion connected to the large-diameter rear part  522  of the nozzle mount  52  by having been press-fitted and inserted into the large-diameter rear part  522 , while having an axially intermediate portion penetrating the inside of the small-diameter mount part  521 . In a state where the nozzle  2  has been connected to the nozzle support  5 , the cleaning water introduction pipe  51  has an axially distal end portion connected to an introduction-side channel interior cylindrical wall  424  (to be described later; see  FIG.  5   ) of an introduction-side channel-forming component  42  of the nozzle  2  by having been press-fitted and inserted into the introduction-side channel interior cylindrical wall  424 . 
     The rear end portion of the cleaning water introduction pipe  51  is press-fitted into the large-diameter rear part  522  of the nozzle mount  52 , and constitutes a water-tight structure functioning as a seal between the cleaning water introduction pipe  51  and the large-diameter rear part  522  of the nozzle mount  52 . The distal end portion of the cleaning water introduction pipe  51  is press-fitted into the introduction-side channel interior cylindrical wall  424  of the introduction-side channel-forming component  42  of the nozzle  2 , and constitutes a water-tight structure functioning as a seal between the cleaning water introduction pipe  51  and the introduction-side channel interior cylindrical wall  424  of the introduction-side channel-forming component  42  of the nozzle  2 . 
     As shown in  FIG.  4   , the large-diameter rear part  522  is connected to the proximal end of the small-diameter mount part  521 , and has a cylindrical shape. The large-diameter rear part  522  has an inner cylinder  523  opening forward, and an outer cylinder  524  disposed outside the inner cylinder  523 . 
     The rear slidable part  53  is connected to the rear end of the nozzle mount  52 . The rear slidable part  53  is mounted to the sanitary cleaning device  1  in an extendable/retractable manner. As shown in  FIG.  2 B , a central cleaning-water introduction part  531  and an outer cleaning-water introduction part  532  are provided at the rear end of the rear slidable part  53 . 
     The central cleaning-water introduction part  531  is an inlet port through which cleaning water is introduced to flow in the axial direction through a radially central portion of the nozzle  2 . The central cleaning-water introduction part  531  has an open rear end, as shown in  FIG.  2 A , and a front end communicating with the interior space of the inner cylinder  523  of the large-diameter rear part  522 , as shown in  FIG.  4   . The outer cleaning-water introduction part  532  is an inlet port through which cleaning water is introduced to flow in the axial direction through a radially outer portion of the nozzle  2 . The outer cleaning-water introduction part  532  has an open rear end, as shown in  FIG.  2 B , and a front end communicating with the space between the outer cylinder  524  and the inner cylinder  523  of the large-diameter rear part  522 , as shown in  FIG.  4   . 
     As shown in  FIG.  4   , the nozzle support  5  has therein an intra-support inner introduction channel F 11  and an intra-support outer introduction channel F 12 . The intra-support inner introduction channel F 11  allows cleaning water, which has been introduced through the central cleaning-water introduction part  531 , to pass through the interior space of the inner cylinder  523  of the large-diameter rear part  522  and the inside of the cleaning water introduction pipe  51 , and to enter an intra-nozzle introduction-side inner channel F 21  (to be described later; see  FIG.  5   ) of the nozzle  2 . 
     The intra-support outer introduction channel F 12  allows cleaning water, which has been introduced through the outer cleaning-water introduction part  532 , to pass through the space between the inner cylinder  523  and the outer cylinder  524  of the large-diameter rear part  522  and the intra-support gap channels Fa between the inner peripheral surface of the small-diameter mount part  521  and the outer peripheral surface of the cleaning water introduction pipe  51 , and to enter an intra-nozzle introduction-side outer channel F 22  (to be described later; see  FIG.  5   ) of the nozzle  2 . 
     As shown in  FIGS.  2 A and  2 B , the proximal end of the nozzle  2  is supported on the nozzle support  5 . The nozzle  2  has the shape of a long circular column and extends in the axial direction. The nozzle  2  has, on its upper surface near the distal end, a first water-ejection opening  414   a  and a second water-ejection opening  415   a  that are aligned in the axial direction. The first water-ejection opening  414   a  and the second water-ejection opening  415   a  are configured to eject cleaning water supplied from a warm water supply unit (not shown). 
     As shown in  FIGS.  3  and  5  to  7   , the nozzle  2  includes a cylindrical nozzle cover  3  and a channel-forming member  4  disposed in the nozzle cover  3 . The channel-forming member  4  has an ejection-side channel-forming component  41  (first channel-forming component), an introduction-side channel-forming component  42  (rear-side channel-forming component, second channel-forming component), and a connection pipe  43  (rear-side channel-forming component) that connects the ejection-side channel-forming component  41  and the introduction-side channel-forming component  42  to each other. 
     The nozzle cover  3  has a cylindrical shape a distal end of which is closed with a distal end closing plate  35 , and a proximal end of which is open. The nozzle cover  3  is made of ceramic. The ejection-side channel-forming component  41 , the introduction-side channel-forming component  42 , and the connection pipe  43  are each made of, for example, a resin material. 
     The nozzle cover  3  has, on its upper surface near the distal end, a first through-hole  31  (nozzle cover-side water ejection opening) and a second through-hole  32  (nozzle cover-side water ejection opening). The nozzle cover  3  has, on its lower surface, a lower surface opening  33 . The lower surface opening  33  is a drainage opening for draining water in the nozzle cover  3  to the outside. When the nozzle  2  is assembled, the lower surface opening  33  is also usable as a hole through which a rod-shaped jig J can be inserted to move the ejection-side channel-forming component  41  toward an upper side, as will be described later (see  FIG.  8 B ). 
     As shown in  FIGS.  5  and  6   , the first and second through-holes  31  and  32  are aligned in the axial direction of the nozzle  2  on the upper surface of the nozzle cover  3  near the distal end. The first and second through-holes  31  and  32  pass through the nozzle cover  3  in a thickness direction. The first and second through-holes  31  and  32  extend in a radial direction of the nozzle cover  3  for a distance corresponding to the thickness of the nozzle cover  3 . The first through-hole  31  receives a first water-ejection protrusion  414  (to be described later) fitted therein, the first water-ejection protrusion  414  being provided on the ejection-side channel-forming component  41  of the channel-forming member  4  housed in the nozzle cover  3 . The second though-hole  32  receives a second water-ejection protrusion  415  (to be described later) fitted therein, the second water-ejection protrusion  415  being provided on the ejection-side channel-forming component  41  of the channel-forming member  4  housed in the nozzle cover  3 . In this manner, positioning of the ejection-side channel-forming component  41  is performed with respect to the nozzle cover  3 . 
     The nozzle cover  3  has a reference surface  381  (reference position) formed at a reference position and a circumferential-positioning notch  382 . The reference surface  381  is constituted of a rear end face of the nozzle cover  3 . The reference surface  381  is in contact with a flange  426  of the introduction-side channel-forming component  42  (to be described later). The circumferential-positioning notch  382  has a semi-circular shape recessed from the reference surface  381  toward the distal end. The circumferential-positioning notch  382  is engaged with a circumferential-positioning projection  426   a  of the flange  426  of the introduction-side channel-forming component  42  (to be described later). 
     As shown in  FIG.  5   , the ejection-side channel-forming component  41 , the introduction-side channel-forming component  42 , and the connection pipe  43  are housed in the nozzle cover  3 . The ejection-side channel-forming component  41  and the introduction-side channel-forming component  42  are aligned in the axial direction of the nozzle cover  3 . In the nozzle cover  3 , the ejection-side channel-forming component  41  is disposed adjacent to the axially distal end and the upper side of the nozzle  2 . In the nozzle cover  3 , the upper side refers to the area that is located inside the nozzle cover  3  and that includes the first through-hole  31  and the second through-hole  32 . In the nozzle cover  3 , the introduction-side channel-forming component  42  is disposed adjacent to the axially proximal end of the nozzle cover  3 . The connection pipe  43  has a cylindrical shape extending in the axial direction of the nozzle cover  3  and connects the ejection-side channel-forming component  41  to the introduction-side channel-forming component  42 . 
     In the nozzle cover  3 , the introduction-side channel-forming component  42  is disposed at the proximal end (rear end) of the ejection-side channel-forming component  41  (to be described later), which is disposed adjacent to the distal end of the nozzle cover  3 . The distal end portion of the introduction-side channel-forming component  42  is fixed in place to the ejection-side channel-forming component  41 . The introduction-side channel-forming component  42  is fixed to the nozzle cover  3 . In the present embodiment, for example, the front surface of the flange  426  (to be described later) of the introduction-side channel-forming component  42  is positioned, with respect to the axial direction of the nozzle cover  3 , on the reference surface  381  at the rear end of the nozzle cover  3 , and is fixed to the nozzle cover  3  by bonding. In another embodiment, the fixing may be achieved by press-fitting. 
     As shown in  FIGS.  5  to  7   , the introduction-side channel-forming component  42  has an introduction-side channel body  421 , a distal-side extension  425  (gap-insertion portion), and the flange  426  formed at the proximal end. The distal-side extension  425  extends toward the distal end from a lower portion of the distal end of the introduction-side channel body  421 , and has a predetermined width in a direction perpendicular to the axial direction of the nozzle cover  3 . In a state where the distal end portion of the introduction-side channel-forming component  42  has been connected to the proximal end portion of the ejection-side channel-forming component  41 , the distal-side extension  425  is disposed in a lower gap Sa (engagement gap, fitting gap) between a lower portion of the ejection-side channel-forming component  41  (to be described later) and the nozzle cover  3 . The lower portion of the ejection-side channel-forming component  41  refers to a portion of the ejection-side channel-forming component  41  disposed close to the upper side in the nozzle cover  3 , the portion being located opposite to the first and second through-holes  31  and  32  of the nozzle cover  3  in a radial direction, and facing downward. 
     As shown in  FIGS.  5  to  7   , the distal-side extension  425  has, at its distal end, a distal-side engagement protrusion  427  (second engagement portion) protruding toward the ejection-side channel-forming component  41 . When the introduction-side channel-forming component  42  is fixed in place to the ejection-side channel-forming component  41  (to be described later) in the nozzle cover  3 , the distal-side engagement protrusion  427  is fixedly engaged with an ejection-side engagement recess  417  (to be described later) of the ejection-side channel-forming component  41 . The distal-side engagement protrusion  427  protrudes upward from the upper surface of the distal end of the distal-side extension  425 . The distal-side engagement protrusion  427  has a predetermined width in the axial direction of the nozzle cover  3 , and extends in a direction perpendicular to the axial direction of the nozzle cover  3  for a distance equal to the width of the distal-side extension  425 . The upper surface of the distal-side engagement protrusion  427  has an arc shape curved downward along the circumference of the nozzle cover  3 . 
     The introduction-side channel body  421  has a substantially cylindrical outer shape. The introduction-side channel body  421  has an introduction-side channel distal-side cylindrical wall  422  formed at the distal end thereof, an introduction-side channel proximal-side outer cylindrical wall  423  formed at the proximal end thereof, and the introduction-side channel interior cylindrical wall  424  formed inside the introduction-side channel proximal-side outer cylindrical wall  423 . 
     The introduction-side channel distal-side cylindrical wall  422  is formed at the end of the introduction-side channel body  421 , the end portion being located adjacent to the distal end of the nozzle cover  3 . The introduction-side channel distal-side cylindrical wall  422  has a cylindrical shape the outer peripheral surface of which is smaller in diameter than the outer peripheral surface of the introduction-side channel body  421  by the height of a step. The introduction-side channel distal-side cylindrical wall  422  extends from the outer peripheral surface of the introduction-side channel body  421  with a step end face  422   b  interposed therebetween, and extends cylindrically toward the distal end from a point located inside with respect to the outer peripheral surface of the introduction-side channel body  421  by the height of the step. 
     The introduction-side channel distal-side cylindrical wall  422  opens toward the ejection-side channel-forming component  41  (to be described later). An O-ring  422   c  (water-tight structure) is attached to the outer peripheral surface of the introduction-side channel distal-side cylindrical wall  422 . To connect the introduction-side channel-forming component  42  to the ejection-side channel-forming component  41 , the outer peripheral surface of the introduction-side channel distal-side cylindrical wall  422  is fitted to an ejection-side channel outer cylindrical wall  412  of an ejection-side channel body  411 . A rear end portion of the connection pipe  43  is fitted to the inner peripheral surface of the introduction-side channel distal-side cylindrical wall  422 . 
     The introduction-side channel distal-side cylindrical wall  422  has a plurality of ribs  422   a  formed on the inner peripheral surface thereof. The plurality of ribs  422   a  are spaced apart from each other in the circumferential direction, and extend in the axial direction. In a state where the connection pipe  43  has been fitted along the inner peripheral surface of the introduction-side channel distal-side cylindrical wall  422 , the plurality of ribs  422   a  are in contact with the outer peripheral surface of the connection pipe  43 . As the result, intra-nozzle gap channels Fb through which cleaning water flows are formed between the outer peripheral surface of the connection pipe  43  and the inner peripheral surface of the introduction-side channel distal-side cylindrical wall  422 . The rear end of the connection pipe  43  is fixed to a point located inward relative to the introduction-side channel distal-side cylindrical wall  422 . 
     The introduction-side channel proximal-side outer cylindrical wall  423  is formed at an end of the introduction-side channel body  421 , the end being adjacent to the proximal end of the nozzle cover  3 . The introduction-side channel proximal-side outer cylindrical wall  423  opens toward the nozzle support  5 . To connect the introduction-side channel-forming component  42  to the nozzle support  5 , the distal end portion of the nozzle support  5  is fitted to the inner peripheral surface of the introduction-side channel proximal-side outer cylindrical wall  423 . An O-ring  423   a  is attached to the outer peripheral surface of the introduction-side channel proximal-side outer cylindrical wall  423 . 
     The introduction-side channel interior cylindrical wall  424  is disposed in the introduction-side channel proximal-side outer cylindrical wall  423  in an axially intermediate portion of the nozzle cover  3 , and has a cylindrical shape having a smaller diameter than the introduction-side channel proximal-side outer cylindrical wall  423 . The introduction-side channel interior cylindrical wall  424  and the introduction-side channel proximal-side outer cylindrical wall  423  form a double pipe structure. The introduction-side channel interior cylindrical wall  424  opens toward the nozzle support  5 . The inner peripheral surface of the introduction-side channel interior cylindrical wall  424  receives the distal end portion of the cleaning water introduction pipe  51  of the nozzle support  5  fitted thereon. 
     The flange  426  is formed at the proximal end of the introduction-side channel-forming component  42  and has the shape of an annular plate expanding outwardly in the radial direction of the nozzle cover  3 . In a state where the nozzle cover  3  has the ejection-side channel-forming component  41  and the introduction-side channel-forming component  42  disposed therein, the flange  426  is in contact with the reference surface  381  formed at the rear end of the nozzle cover  3 . In the present embodiment, the front surface of the flange  426  is bonded and fixed to the reference surface  381  formed at the rear end of the nozzle cover  3 . As a result, in a state where the nozzle cover  3  has the ejection-side channel-forming component  41  and the introduction-side channel-forming component  42  disposed therein, the introduction-side channel-forming component  42  is fixed while being positioned with respect to the axial direction of the nozzle cover  3 . 
     The flange  426  has, on a circumferentially upper portion of its surface facing the distal end, the circumferential-positioning projection  426   a  having a semi-circular shape and projecting toward the distal end. In the state where the nozzle cover  3  has the ejection-side channel-forming component  41  and the introduction-side channel-forming component  42  disposed therein, the circumferential-positioning projection  426   a  is engaged with the circumferential-positioning notch  382  of the nozzle cover  3 . As a result, in the state where the nozzle cover  3  has the ejection-side channel-forming component  41  and the introduction-side channel-forming component  42  disposed therein, the introduction-side channel-forming component  42  is fixed while being circumferentially positioned with respect to the nozzle cover  3 . 
     As shown in  FIG.  5   , the intra-nozzle introduction-side inner channel F 21  and the intra-nozzle introduction-side outer channel F 22  are formed in the introduction-side channel body  421 . The intra-nozzle introduction-side inner channel F 21  allows cleaning water, which has been introduced through the intra-support inner introduction channel F 11  of the nozzle support  5 , to pass mainly through a radially central space in the introduction-side channel body  421  and the connection pipe  43 , and to enter an intra-nozzle ejection-side inner channel F 31  of the ejection-side channel body  411 . 
     The intra-nozzle introduction-side outer channel F 22  allows cleaning water, which has been introduced through the intra-support outer introduction channel F 12  of the nozzle support  5 , to pass through a space located radially outward in the introduction-side channel body  421 , and through the intra-nozzle gap channels Fb between the outer peripheral surface of the connection pipe  43  and the inner peripheral surface of the introduction-side channel distal-side cylindrical wall  422 , and to enter an intra-nozzle ejection-side outer channel F 32  of the ejection-side channel body  411 . 
     The ejection-side channel-forming component  41  is disposed in the nozzle cover  3  and constitutes an axially distal end portion of the nozzle  2 . The proximal end portion of the ejection-side channel-forming component  41  is connected to the distal end portion of the introduction-side channel-forming component  42 . In a state where the nozzle cover  3  has the ejection-side channel-forming component  41  disposed therein, a gap S 1  is formed between an end face  41   a  at the distal end of the ejection-side channel-forming component  41  and an inner surface  35   a  of the distal end closing plate  35  of the nozzle cover  3 . 
     As shown in  FIGS.  5  to  7   , the ejection-side channel-forming component  41  has the ejection-side channel body  411 , the first water-ejection protrusion  414  (water-ejection portion) having a protruding shape, the second water-ejection protrusion  415  (water-ejection portion) having a protruding shape, and the ejection-side engagement recess  417  (first engagement portion). 
     The ejection-side channel body  411  has a closed distal end, and has a cylindrical outer shape. The ejection-side channel body  411  has the ejection-side channel outer cylindrical wall  412  and an ejection-side channel inner cylindrical wall  413  disposed in the ejection-side channel outer cylindrical wall  412  in an axially intermediate portion of the nozzle cover  3 . 
     The ejection-side channel outer cylindrical wall  412  has a substantially cylindrical shape, and extends in the axial direction of the nozzle cover  3 . The ejection-side channel outer cylindrical wall  412  constitutes the outer shape of the ejection-side channel body  411 , and opens toward the proximal end of the nozzle cover  3 . The ejection-side channel outer cylindrical wall  412  receives, on the inner peripheral surface thereof, the introduction-side channel distal-side cylindrical wall  422  formed at the distal end of the introduction-side channel-forming component  42 . 
     The ejection-side channel-forming component  41  and the introduction-side channel-forming component  42  are arranged to be adjustable in position in the axial direction, while overlapping with each other as viewed in a direction perpendicular to the axial direction of the nozzle cover  3 . The O-ring  422   c  constitutes a water-tight structure functioning as a seal between the ejection-side channel-forming component  41  and the introduction-side channel-forming component  42 , in the portion where the channel-forming components  41  and  42  overlap with each other as viewed in the direction perpendicular to the axial direction of the nozzle cover  3 . 
     As shown in  FIG.  5   , a gap S 3  is formed between the proximal end face of the ejection-side channel outer cylindrical wall  412  and the step end face  422   b  formed adjacent to the proximal end of the introduction-side channel distal-side cylindrical wall  422  of the introduction-side channel-forming component  42 . The ejection-side channel outer cylindrical wall  412  has a step surface formed adjacent to the distal end and facing radially inward. A gap S 4  is formed between this step surface and the distal end face of the introduction-side channel distal-side cylindrical wall  422  of the introduction-side channel-forming component  42 . 
     As shown in  FIGS.  5  to  7   , the ejection-side channel inner cylindrical wall  413  is located inside the ejection-side channel outer cylindrical wall  412  disposed in an axially intermediate portion of the nozzle cover  3 , and has a cylindrical shape with a smaller diameter than the ejection-side channel outer cylindrical wall  412 . The ejection-side channel inner cylindrical wall  413  and the ejection-side channel outer cylindrical wall  412  form a double pipe structure. The ejection-side channel inner cylindrical wall  413  opens toward the proximal end of the nozzle cover  3 . The inner peripheral surface of the ejection-side channel inner cylindrical wall  413  receives the distal end portion of the connection pipe  43  press-fitted thereon. 
     The positions of the connection pipe  43  and the introduction-side channel-forming component  42  are adjustable with respect to ejection-side channel-forming component  41  in the axial direction of the nozzle cover  3 . The connection pipe  43  and the ejection-side channel-forming component  41  are arranged to be adjustable in position in the axial direction, while overlapping with each other as viewed in a direction perpendicular to the axial direction of the nozzle cover  3 . The distal end portion of the connection pipe  43  is press-fitted onto the inner peripheral surface of the ejection-side channel inner cylindrical wall  413 . The distal end portion of the connection pipe  43  constitutes a water-tight structure functioning as a seal between the connection pipe  43  and the ejection-side channel-forming component  41 , in the portion where the connection pipe  43  and the ejection-side channel-forming component  41  overlap with each other as viewed in a direction perpendicular to the axial direction of the nozzle cover  3 . As shown in  FIG.  5   , a gap S 2  is formed between a step surface of the ejection-side channel inner cylindrical wall  413  adjacent to the distal end and the distal end face of the connection pipe  43 . 
     As shown in  FIGS.  5  to  7   , the first water-ejection protrusion  414  and the second water-ejection protrusion  415  are aligned in the axial direction of the nozzle cover  3  on the upper surface of a distal end portion of the ejection-side channel body  411 . The first water-ejection protrusion  414  and the second water-ejection protrusion  415  each have a shape of a circular column, and protrude upward from the upper surface of the distal end portion of the ejection-side channel body  411 . 
     The first water-ejection protrusion  414  has the first water-ejection opening  414   a  (channel-side water ejection opening). The first water-ejection opening  414   a  is formed to coincide in position with the first through-hole  31  of the nozzle cover  3  in the axial direction of the nozzle cover  3 , and communicates with the first through-hole  31  of the nozzle cover  3 . The first water-ejection opening  414   a  is inclined with respect to the thickness direction of the first water-ejection protrusion  414  such that the outlet of the first water-ejection opening  414   a  is oriented toward the proximal end of the nozzle  2 . 
     The second water-ejection protrusion  415  has the second water-ejection opening  415   a  (channel-side water ejection opening). The second water-ejection opening  415   a  is formed to coincide in position with the second through-hole  32  of the nozzle cover  3  in the axial direction of the nozzle cover  3 , and communicates with the second through-hole  32  of the nozzle cover  3 . The second water-ejection opening  415   a  is inclined with respect to the thickness direction of the second water-ejection protrusion  415  such that the outlet of the second water-ejection opening  415   a  is oriented toward the proximal end of the nozzle  2 . 
     The configuration in which the first water-ejection opening  414   a  and the second water-ejection opening  415   a  are inclined such that their outlets are oriented toward the proximal end of the nozzle  2  causes the cleaning water that has flowed through the channel-forming member  4  to be ejected onto a target position. 
     In a state where the nozzle cover  3  has the channel-forming member  4  disposed therein, the first water-ejection protrusion  414  is fitted in the first through-hole  31  along the depth thereof. In a state where the nozzle cover  3  has the channel-forming member  4  disposed therein, the second water-ejection protrusion  415  is fitted in the second through-hole  32  along the depth thereof. The surface of the first water-ejection protrusion  414  and the surface of the second water-ejection protrusion  415  are substantially flush with the surface of the nozzle cover  3 . The state indicated by the term “substantially flush” includes a state where the surface of the first water-ejection protrusion  414  and the surface of the second water-ejection protrusion  415  are not completely coplanar with the surface of the nozzle cover  3 , in addition to a state where these surfaces are coplanar with each other. The state indicated by the term “substantially flush” includes a case where the surface of the first water-ejection protrusion  414  and the surface of the second water-ejection protrusion  415  are slightly below the surface of the nozzle cover  3 . Thus, the first through-hole  31  of the nozzle cover  3  is blocked by the first water-ejection protrusion  414  and the second through-hole  32  of the nozzle cover  3  is blocked by the second water-ejection protrusion  415 . The surface of the first water-ejection protrusion  414  and the surface of the second water-ejection protrusion  415  may be above the surface of the nozzle cover  3 . 
     The ejection-side engagement recess  417  is formed on the lower surface of a lower portion of the ejection-side channel-forming component  41 . The ejection-side engagement recess  417  is an upward recess formed on the lower surface of the ejection-side channel-forming component  41 , and is formed as an arc-shaped groove having a predetermined width in the axial direction of the nozzle cover  3  and extending in a predetermined length in the circumferential direction of the nozzle cover  3 . The ejection-side engagement recess  417  is an upward recess formed on the lower surface of the ejection-side channel-forming component  41 , and extends in the predetermined length in the circumferential direction. The ejection-side engagement recess  417  is fixedly engaged with the distal-side engagement protrusion  427  of the distal-side extension  425  of the introduction-side channel-forming component  42 . Thus, the ejection-side channel-forming component  41  and the introduction-side channel-forming component  42  are fixed in place to each other, while being mutually restricted in movement in the axial and circumferential directions of the nozzle cover  3 . 
     As shown in  FIG.  5   , in a state where the nozzle cover  3  has the ejection-side channel-forming component  41  assembled thereto, the lower gap Sa is formed in a radial direction of the nozzle cover  3  (direction perpendicular to the axial direction), between a lower portion of the ejection-side channel-forming component  41  and the nozzle cover  3 . The lower gap Sa is a space for allowing the first water-ejection protrusion  414  and the second water-ejection protrusion  415  to be fitted into the first through-hole  31  and the second through-hole  32 , respectively. The lower gap Sa also serves as a space for allowing the distal-side engagement protrusion  427  of the distal-side extension  425  of the introduction-side channel-forming component  42  to be fixedly engaged with the ejection-side engagement recess  417  of the ejection-side channel-forming component  41 . 
     In a state where the nozzle cover  3  has the ejection-side channel-forming component  41  assembled thereto, the introduction-side channel-forming component  42  is assembled to the nozzle cover  3 , whereby the distal-side extension  425  of the introduction-side channel-forming component  42  becomes disposed in the lower gap Sa. The distal-side extension  425  of the introduction-side channel-forming component  42  is disposed in the lower gap Sa between the ejection-side channel-forming component  41  and the nozzle cover  3 . The distal-side engagement protrusion  427  of the distal-side extension  425  of the introduction-side channel-forming component  42  is fixedly engaged with the ejection-side engagement recess  417  of the ejection-side channel-forming component  41 . As a result, the ejection-side channel-forming component  41  and the introduction-side channel-forming component  42  are fixed in place to each other so as not be separated in the axial direction. Arranging the distal-side extension  425  in the lower gap Sa enables the ejection-side channel-forming component  41  to be supported from below, whereby the positioning of the ejection-side channel-forming component  41  can be performed in the radial direction of the nozzle cover  3 . 
     As shown in  FIG.  5   , the ejection-side channel body  411  has therein the intra-nozzle ejection-side inner channel F 31  and the intra-nozzle ejection-side outer channel F 32 . The intra-nozzle ejection-side inner channel F 31  allows cleaning water, which has flowed through the connection pipe  43  connected to the ejection-side channel inner cylindrical wall  413  of the ejection-side channel body  411 , to pass mainly through a radially central portion of the ejection-side channel body  411 , and to reach the first water-ejection opening  414   a  of the first water-ejection protrusion  414 . 
     The intra-nozzle ejection-side outer channel F 32  allows cleaning water, which has flowed through the introduction-side channel-forming component  42  connected to the ejection-side channel outer cylindrical wall  412  at the proximal end of the ejection-side channel body  411 , to pass mainly through a radially outer portion of the ejection-side channel body  411 , and to reach the second water-ejection opening  415   a  of the second water-ejection protrusion  415 . 
     Next, a process for assembling the nozzle  2  will be described. As shown in  FIG.  8 A , to assemble the nozzle  2 , the ejection-side channel-forming component  41  of the channel-forming member  4  is inserted into the nozzle cover  3  through the open end of the nozzle cover  3 . The ejection-side channel-forming component  41  is then moved toward the axially distal end until the ejection-side channel-forming component  41  reaches a location at which the first water-ejection protrusion  414  and the second water-ejection protrusion  415  are ready to be fitted into the first though-hole  31  and the second through-hole  32 , respectively. 
     As shown in  FIG.  8 B , in the state where the ejection-side channel-forming component  41  has been assembled to the nozzle cover  3 , the lower gap Sa is formed in the radial direction of the nozzle cover  3 , between the lower portion of the ejection-side channel-forming component  41  and the nozzle cover  3 . The lower gap Sa is the space for allowing the first water-ejection protrusion  414  and the second water-ejection protrusion  415  to be fitted into the first through-hole  31  and the second through-hole  32 , respectively. The lower gap Sa also serves as the space for allowing the distal-side engagement protrusion  427  of the distal-side extension  425  of the introduction-side channel-forming component  42  to be fixedly engaged with the ejection-side engagement recess  417  of the ejection-side channel-forming component  41 . 
     As shown in  FIG.  8 B , a rod-shaped jig J is then inserted through the lower surface opening  33  of the nozzle cover  3  to move the ejection-side channel-forming component  41  upwardly, so that the first water-ejection protrusion  414  and the second water-ejection protrusion  415  are fitted into the first though-hole  31  and the second through-hole  32 , respectively. Note that this is a non-limiting example. It is conceivable that a jig is inserted through the open end of the nozzle cover  3  to move the ejection-side channel-forming component  41  upwardly, so that the first water-ejection protrusion  414  and the second water-ejection protrusion  415  are fitted into the first though-hole  31  and the second through-hole  32 , respectively. Fitting the first water-ejection protrusion  414  into the first though-hole  31  and the second water-ejection protrusion  415  into the second through-hole  32  results in the positioning of the ejection-side channel-forming component  41  with respect to the nozzle cover  3 . 
     Since the first water-ejection protrusion  414  and the second water-ejection protrusion  415  are fitted in the first though-hole  31  and the second through-hole  32 , the first though-hole  31  and the second through-hole  32  of the nozzle cover  3  are less likely to become dirty in the depth direction. As a result, maintenance operation can be reduced. 
     The first water-ejection protrusion  414  and the second water-ejection protrusion  415  are arranged such that their surfaces are not below the surface of the nozzle cover  3 . That is, the first though-hole  31  and the second through-hole  32  of the nozzle cover  3  are blocked by the first water-ejection protrusion  414  and the second water-ejection protrusion  415 , respectively. Thus, the first though-hole  31  and the second through-hole  32  do not form any recessed portion on the surface of the nozzle cover  3 , making it less likely for dirt to accumulate in the first though-hole  31  and the second through-hole  32 . 
     Next, as shown in  FIG.  8 C , the introduction-side channel-forming component  42  having the connection pipe  43  attached to the distal end thereof is inserted through the open end of the nozzle cover  3 . Thereafter, as shown in  FIG.  8 D , the distal end portion of the connection pipe  43  is press-fitted into the ejection-side channel inner cylindrical wall  413  of the ejection-side channel-forming component  41 , and at the same time, the introduction-side channel distal-side cylindrical wall  422  of the introduction-side channel-forming component  42  is inserted into the ejection-side channel outer cylindrical wall  412  of the ejection-side channel-forming component  41 . 
     The distal-side extension  425  of the introduction-side channel-forming component  42  becomes disposed in the lower gap Sa between the ejection-side channel-forming component  41  and the nozzle cover  3 . The distal-side engagement protrusion  427  of the distal-side extension  425  of the introduction-side channel-forming component  42  is fixedly engaged with the ejection-side engagement recess  417  of the ejection-side channel-forming component  41 . As a result, the ejection-side channel-forming component  41  and the introduction-side channel-forming component  42  are fixed in place to each other so as not to be separated in the axial direction. Arranging the distal-side extension  425  in the lower gap Sa enables the ejection-side channel-forming component  41  to be supported from below, whereby the positioning of the ejection-side channel-forming component  41  can be performed in the radial direction of the nozzle cover  3 . 
     At the rear end of the introduction-side channel-forming component  42 , the circumferential-positioning projection  426   a  provided at an upper portion of the flange  426  of the introduction-side channel-forming component  42  has been engaged with the circumferential-positioning notch  382  of the nozzle cover  3 . In this state, the positioning of the flange  426  of the introduction-side channel-forming component  42  in the axial direction of the nozzle cover  3  is performed at the reference surface  381  formed at the rear end of the nozzle cover  3 , and the flange  426  is strongly fixed to the nozzle cover  3  by bonding. 
     In the nozzle  2  configured as described above, the ejection-side channel-forming component  41  is fixed in place to the introduction-side channel-forming component  42  so that the channel-forming components  41  and  42  are integrated with each other so as not to be separated from each other in the axial direction. Thus, the introduction-side channel-forming component  42  can be stably fixed to the ejection-side channel-forming component  41 . As a result, the channel-forming member  4  can be stably fixed in the nozzle cover  3 . 
     To remove the channel-forming member  4  from the nozzle cover  3 , the introduction-side channel-forming component  42  is pulled out through the open end of the nozzle cover  3  in the axial direction. In this way, the channel-forming member  4  composed of the ejection-side channel-forming component  41  and the introduction-side channel-forming component  42 , which are integrated with each other so as not to be separated in the axial direction, can be easily removed from the nozzle cover  3 . 
     According to the present embodiment, the ejection-side channel-forming component  41  and the introduction-side channel-forming component  42  are fixed in place, while being mutually restricted in movement in the axial and circumferential directions of the nozzle cover  3 . This feature enables easy positioning of the introduction-side channel-forming component  42  with respect to the ejection-side channel-forming component  41  in the axial and circumferential directions, such that the ejection-side channel-forming component  41  and the introduction-side channel-forming component  42  are prevented from displacing in the axial and circumferential directions. 
     According to the present embodiment, in a state where the nozzle cover  3  has the ejection-side channel-forming component  41  assembled thereto, the lower gap Sa is formed between the ejection-side channel-forming component  41  and the nozzle cover  3 . The lower gap Sa is the space for allowing the first water-ejection protrusion  414  and the second water-ejection protrusion  415  to be fitted into the first through-hole  31  and the second through-hole  32 , respectively. Thus, since the lower gap Sa can be utilized to move the ejection-side channel-forming component  41 , the first water-ejection protrusion  414  and the second water-ejection protrusion  415  can be easily fitted into the first through-hole  31  and the second through-hole  32 , respectively. This makes it easy to assemble the nozzle  2 . 
     The lower gap Sa also serves as the space for allowing the distal-side engagement protrusion  427  of the distal-side extension  425  of the introduction-side channel-forming component  42  to be fixedly engaged with the ejection-side engagement recess  417  of the ejection-side channel-forming component  41 . Thus, arranging the distal-side extension  425  of the introduction-side channel-forming component  42  in the lower gap Sa makes it easy to fixedly engage the distal-side engagement protrusion  427  of the distal-side extension  425  of the introduction-side channel-forming component  42  with the ejection-side engagement recess  417  of the ejection-side channel-forming component  41 . This simple structure to fixedly engage the distal-side engagement protrusion  427  of the introduction-side channel-forming component  42  with the ejection-side engagement recess  417  of the ejection-side channel-forming component  41  enables the ejection-side channel-forming component  41  and the introduction-side channel-forming component  42  to be fixed in place to each other in the nozzle cover  3  so as not to be separated from each other in the axial direction. This feature makes it easy to assemble the nozzle  2 . 
     The introduction-side channel-forming component  42  is configured to contribute to the positioning of the ejection-side channel-forming component  41  in such a manner that the distal-side extension  425  of the introduction-side channel-forming component  42  is arranged in the lower gap Sa. This feature makes it less likely for the ejection-side channel-forming component  41  to be displaced in the radial direction of the nozzle cover  3 , and can maintain the first and second water-ejection protrusions  414  and  415  fitted in the first and second through-holes  31  and  32 , respectively. 
     According to the present embodiment, the introduction-side channel-forming component  42  is fixed to the nozzle cover  3  by bonding and/or press-fitting. Thus, the ejection-side channel-forming component  41  and the introduction-side channel-forming component  42  can be strongly fixed to the nozzle cover  3 . 
     The above-described nozzle  2  of the present embodiment provides the following advantages. The nozzle  2  of the present embodiment includes: the nozzle cover  3  made of ceramic and having the second though-hole  32 ; the ejection-side channel-forming component  41  disposed in the nozzle cover  3  and having the second water-ejection opening  415   a  which communicates with the second though-hole  32 ; and the rear-side channel-forming components (introduction-side channel-forming component  42 , the connection pipe  43 ) connected to a rear portion of the ejection-side channel-forming component  41  in the axial direction of the nozzle cover  3 , and capable of being adjusted in the axial direction of the nozzle cover  3  with respect to the ejection-side channel-forming component  41 . 
     With this configuration, even though the nozzle cover  3  is made of ceramic and even if the nozzle cover  3  has a dimensional deviation in the axial direction caused by the manufacturing process, the dimensional deviation in the axial direction is canceled out and the positioning of the channel-forming member  4  can be easily performed. Further, even if the ejection-side channel-forming component  41  and the introduction-side channel-forming component  42  have a dimensional deviation in the axial direction caused by the manufacturing process, the dimensional deviation in the axial direction is canceled out and the positioning of the channel-forming member  4  can be easily performed. This feature makes it easy to assemble the nozzle  2 . 
     According to the present embodiment, the nozzle cover  3  has therein the gaps S 1 , S 2 , S 3 , and S 4  which enable the ejection-side channel-forming component  41 , the introduction-side channel-forming component  42 , and the connection pipe  43  to be adjusted in position in the axial direction of the nozzle cover  3 . With this configuration, even if the nozzle cover  3 , the ejection-side channel-forming component  41 , the introduction-side channel-forming component  42 , and the connection pipe  43  have a dimensional deviation in the axial direction caused by the manufacturing process, the dimensional deviation in the axial direction is canceled out and the positioning of the channel-forming member  4  can be easily performed in the axial direction. This feature makes it easy to assemble the nozzle  2 . 
     According to the present embodiment, a water-tight structure functioning as a seal between the ejection-side channel-forming component  41  and the introduction-side channel-forming component  42  is provided in a portion where the channel-forming components  41  and  42  overlap with each other as viewed in a direction perpendicular to the axial direction of the nozzle cover  3 . Further, a water-tight structure functioning as a seal between the ejection-side channel-forming component  41  and the connection pipe  43  is provided in a portion where the ejection-side channel-forming component  41  and the connection pipe  43  overlap with each other as viewed in a direction perpendicular to the axial direction of the nozzle cover  3 . Thus, even though the channel-forming member  4  is composed of two or more components, leakage of water is prevented in each portion where the ejection-side channel-forming component  41 , the introduction-side channel-forming component  42 , and the connection pipe  43  respectively overlap with each other. Consequently, it is ensured that the channel-forming member  4  fulfills the function as the channel of cleaning water. 
     According to the present embodiment, the positioning of the ejection-side channel-forming component  41  is performed with respect to the nozzle cover  3 . This feature facilitates the positioning of the ejection-side channel-forming component  41  in the axial direction of the nozzle cover  3 . 
     According to the present embodiment, the ejection-side channel-forming component  41  has the first water-ejection protrusion  414  having a protruding shape and provided with the first water-ejection opening  414   a , and the second water-ejection protrusion  415  having a protruding shape and provided with the second water-ejection opening  415   a . The first water-ejection protrusion  414  is fitted in the first through-hole  31  of the nozzle cover  3  while the second water-ejection protrusion  415  is fitted in the second through-hole  32  of the nozzle cover  3 . This feature facilitates the positioning of the ejection-side channel-forming component  41  in the axial direction of the nozzle cover  3 . 
     According to the present embodiment, the positioning of the introduction-side channel-forming component  42  is performed in the axial direction of the nozzle cover  3  at the reference surface  381  formed in the rear portion the nozzle cover  3 . Thus, in a state where the positioning of the introduction-side channel-forming component  42  has been performed in the axial direction at the reference surface  381 , the ejection-side channel-forming component  41 , the introduction-side channel-forming component  42 , and the connection pipe  43  are arranged in the nozzle cover  3  such that their positions in the axial direction can be adjusted. As a result, the positioning of the ejection-side channel-forming component  41 , the introduction-side channel-forming component  42 , and the connection pipe  43  can easily performed in the axial direction of the nozzle cover  3 . 
     According to the present embodiment, the introduction-side channel-forming component  42  is fixed to the nozzle cover  3 . Thus, since the introduction-side channel-forming component  42  is fixed while having been positioned in the axial direction of the nozzle cover  3 , the ejection-side channel-forming component  41 , the introduction-side channel-forming component  42 , and the connection pipe  43  can be fixed while having been positioned in the axial direction of the nozzle cover  3 . 
     According to the present embodiment, in a state where the nozzle cover  3  has the ejection-side channel-forming component  41  assembled thereto, the lower gap Sa is formed between the ejection-side channel-forming component  41  and the nozzle cover  3 . The lower gap Sa is the space for allowing the first water-ejection protrusion  414  and the second water-ejection protrusion  415  to be fitted into the first through-hole  31  and the second through-hole  32 , respectively. Thus, since the lower gap Sa can be utilized to move the ejection-side channel-forming component  41 , the first water-ejection protrusion  414  and the second water-ejection protrusion  415  can be easily fitted into the first through-hole  31  and the second through-hole  32 , respectively. This makes it easy to assemble the nozzle  2 . 
     According to the present embodiment, the introduction-side channel-forming component  42  is fixed in place to the ejection-side channel-forming component  41 . Thus, the ejection-side channel-forming component  41  and the introduction-side channel-forming component  42  are integrated with each other so as not to be separated in the axial direction, whereby the introduction-side channel-forming component  42  can be stably fixed to the ejection-side channel-forming component  41 . As a result, the channel-forming member  4  can be stably fixed in the nozzle cover  3 . To remove the channel-forming member  4  from the nozzle cover  3 , the introduction-side channel-forming component  42  is pulled out through the open end of the nozzle cover  3  in the axial direction. In this way, the channel-forming member  4  composed of the ejection-side channel-forming component  41  and the introduction-side channel-forming component  42 , which are integrated with each other so as not to be separates in the axial direction, can be easily removed from the nozzle cover  3 . 
     Next, a nozzle  2 A of a second embodiment will be described. In the following description of the second embodiment, components and elements that are the same or similar to those of the first embodiment are denoted by the same or similar reference characters, and description of such components and elements will be simplified or omitted. The second embodiment differs in the number of channels from the first embodiment. Specifically, while the first embodiment has two channels, the second embodiment has one channel. The nozzle  2 A of the second embodiment differs from the nozzle  2  of the first embodiment in that a channel-forming member  4 A of the second embodiment includes an ejection-side channel-forming component  45  and an introduction-side channel-forming component  46 . 
     As shown in  FIGS.  9  and  10   , the nozzle  2 A includes a cylindrical nozzle cover  3 A and the channel-forming member  4 A disposed in the nozzle cover  3 A. The channel-forming member  4 A has the ejection-side channel-forming component  45  (distal-side channel-forming component, first channel-forming component) and the introduction-side channel-forming component  46  (rear-side channel-forming component, second channel-forming component). The nozzle cover  3 A has, on its upper surface near the distal end, a first through-hole  31 . The first through-hole  31  receives a first water-ejection protrusion  454  (to be described later) fitted therein, the first water-ejection protrusion  454  being provided on the ejection-side channel-forming component  45  of the channel-forming member  4 A disposed in the nozzle cover  3 A. 
     The ejection-side channel-forming component  45  and the introduction-side channel-forming component  46  are disposed in the nozzle cover  3 A. The ejection-side channel-forming component  45  and the introduction-side channel-forming component  46  are aligned in the axial direction of the nozzle cover  3 A. In the nozzle cover  3 A, the ejection-side channel-forming component  45  is disposed adjacent to the axially distal end and the upper side of the nozzle  2 A. In the nozzle cover  3 A, the introduction-side channel-forming component  46  is disposed adjacent to the axially proximal end of the nozzle cover  3 A. 
     The introduction-side channel-forming component  46  is fixed to a reference surface  381  of the nozzle cover  3 A by bonding and/or press-fitting. A distal end portion of the introduction-side channel-forming component  46  is fixed in place to a proximal end portion (rear portion) of the ejection-side channel-forming component  45 . 
     The introduction-side channel-forming component  46  has an introduction-side channel body  461 , a distal-side extension  465  (gap-insertion portion) extending toward the distal end from a lower portion of a distal end of the introduction-side channel body  461 , and a flange  466  formed in a proximal end portion of the introduction-side channel body  461 . In a state where the distal end portion of the introduction-side channel-forming component  46  is connected to the proximal end portion of the ejection-side channel-forming component  45 , the distal-side extension  465  is disposed in a lower gap Sa (engagement gap, fitting gap) between a lower portion of the ejection-side channel-forming component  45  (to be described later) and the nozzle cover  3 A. 
     The introduction-side channel body  461  has a cylindrical outer shape. The introduction-side channel body  461  has an introduction-side channel distal-side cylindrical wall  462  formed adjacent to the distal end, and an introduction-side channel proximal-side outer cylindrical wall  463  formed adjacent to the proximal end. 
     The introduction-side channel distal-side cylindrical wall  462  is formed at an end of the introduction-side channel body  461 , the end being located adjacent to the distal end of the nozzle cover  3 A. The introduction-side channel distal-side cylindrical wall  462  has a cylindrical shape the outer peripheral surface of which is smaller in diameter than the outer peripheral surface of the introduction-side channel body  461  by the height of a step formed. The introduction-side channel distal-side cylindrical wall  462  extends from the outer peripheral surface of the introduction-side channel body  461  with a step end face  462   b  interposed therebetween, and extends cylindrically toward the distal end from a point located inside with respect to the outer peripheral surface of the introduction-side channel body  461  by the height of the step. 
     The introduction-side channel distal-side cylindrical wall  462  opens toward the ejection-side channel-forming component  45  (to be described later). An O-ring  462   c  is attached to the outer peripheral surface of the introduction-side channel distal-side cylindrical wall  462 . To connect the introduction-side channel-forming component  46  to the ejection-side channel-forming component  45 , the outer peripheral surface of the introduction-side channel distal-side cylindrical wall  462  is fitted to an ejection-side channel outer cylindrical wall  452  of an ejection-side channel body  451 . 
     The introduction-side channel proximal-side outer cylindrical wall  463  is formed at an end of the introduction-side channel body  461 , the end being located adjacent to the proximal end of the nozzle cover  3 A. The introduction-side channel proximal-side outer cylindrical wall  463  opens toward a nozzle support (not shown). The nozzle support of the second embodiment supplies cleaning water to the nozzle  2 A through one channel, whereas the nozzle support  5  of the first embodiment supplies cleaning water to the nozzle  2  through two channels. 
     To connect the introduction-side channel-forming component  46  to the nozzle support (not shown), a distal end portion of the nozzle support is fitted on the inner peripheral surface of the introduction-side channel proximal-side outer cylindrical wall  463 . An O-ring  463   a  is attached to the outer peripheral surface of the introduction-side channel proximal-side outer cylindrical wall  463 . 
     As shown in  FIG.  9   , an intra-nozzle introduction channel F 4  is formed in the introduction-side channel body  461 . The intra-nozzle introduction channel F 4  allows cleaning water, which has been introduced from the nozzle support (not shown), to flow to an intra-nozzle ejection-side inner channel F 5  of the ejection-side channel body  451 . 
     The ejection-side channel-forming component  45  is disposed in the nozzle cover  3 A and constitutes an axially distal end portion of the nozzle  2 A. The proximal end portion of the ejection-side channel-forming component  45  is connected to the distal end portion of the introduction-side channel-forming component  46 . In a state where the nozzle cover  3 A has the ejection-side channel-forming component  45  disposed therein, a gap S 1 a is formed between an end face  45   a  at the distal end of the ejection-side channel-forming component  45  and an inner surface  35   a  of a distal end closing plate  35  of the nozzle cover  3 A. 
     As shown in  FIGS.  9  and  10   , the ejection-side channel-forming component  45  has the ejection-side channel body  451  and a first water-ejection protrusion  454  (water-ejection portion) having a protruding shape. The ejection-side channel body  451  has a closed distal end, and has a cylindrical outer shape. The ejection-side channel body  451  has the ejection-side channel outer cylindrical wall  452 . 
     The ejection-side channel outer cylindrical wall  452  has a substantially cylindrical shape, and extends in the axial direction of the nozzle cover  3 A. The ejection-side channel outer cylindrical wall  452  constitutes the outer shape of the ejection-side channel body  451 , and opens toward the proximal end of the nozzle cover  3 A. The ejection-side channel outer cylindrical wall  452  receives, on the inner peripheral surface thereof, the introduction-side channel distal-side cylindrical wall  462  provided at the distal end of the introduction-side channel-forming component  46 . 
     The ejection-side channel-forming component  45  and the introduction-side channel-forming component  46  are arranged to be adjustable in position in the axial direction, while overlapping with each other as viewed in a direction perpendicular to the axial direction of the nozzle cover  3 A. The O-ring  462   c  constitutes a water-tight structure functioning as a seal between the ejection-side channel-forming component  45  and the introduction-side channel-forming component  46 , in the portion where the channel-forming components  45  and  46  overlap with each other as viewed in the direction perpendicular to the axial direction of the nozzle cover  3 A. 
     As shown in  FIG.  9   , a gap S 5  is formed between the proximal end face of the ejection-side channel outer cylindrical wall  452  and the step end face  462   b  formed adjacent to the proximal end of the introduction-side channel distal-side cylindrical wall  462  of the introduction-side channel-forming component  46 . The ejection-side channel outer cylindrical wall  452  has a step surface formed adjacent to the distal end and facing radially inward. A gap S 6  is formed between the step surface and a distal end face of the introduction-side channel distal-side cylindrical wall  462  of the introduction-side channel-forming component  46 . 
     The first water-ejection protrusion  454  is disposed on the upper surface of a distal end portion of the ejection-side channel body  451 . The first water-ejection protrusion  454  has the shape of a circular column, and protrudes upward from the upper surface of the distal end portion of the ejection-side channel body  451 . 
     The first water-ejection protrusion  454  has a first water-ejection opening  454   a  (channel-side water-ejection opening). The first water-ejection opening  454   a  is formed to coincide in position with the first through-hole  31  of the nozzle cover  3 A in the axial direction of the nozzle cover  3 A, and communicates with the first through-hole  31  of the nozzle cover  3 A. The first water-ejection opening  454   a  is inclined with respect to the thickness direction of the first water-ejection protrusion  454  such that the outlet of the first water-ejection opening  454   a  is oriented toward the proximal end of the nozzle  2 A. 
     The configuration in which the first water-ejection opening  454   a  is inclined so that the outlet thereof is oriented toward the proximal end of the nozzle  2 A causes the cleaning water that has flowed through the channel-forming member  4 A to be ejected onto a target position. 
     In a state where the nozzle cover  3 A has the channel-forming member  4 A disposed therein, the first water-ejection protrusion  454  is fitted in the first through-hole  31  along the depth thereof. The surface of the first water-ejection protrusion  454  is substantially flush with the surface of the nozzle cover  3 A. The state indicated by the term “substantially flush” includes a state where the surface of the first water-ejection protrusion  454  is not completely coplanar with the surface of the nozzle cover  3 A, in addition to a state where these surfaces are coplanar with each other. The state indicated by the term “substantially flush” includes a case the surface of the first water-ejection protrusion  454  is slightly below the surface of the nozzle cover  3 A. Thus, the first through-hole  31  of the nozzle cover  3 A is blocked by the first water-ejection protrusion  454 . The surface of the first water-ejection protrusion  454  may be above the surface of the nozzle cover  3 A. 
     As shown in  FIG.  9   , in a state where the nozzle cover  3 A has the ejection-side channel-forming component  45  assembled thereto, the introduction-side channel-forming component  46  is assembled to the nozzle cover  3 A, whereby the distal-side extension  465  of the introduction-side channel-forming component  46  becomes disposed in the lower gap Sa. Arranging the distal-side extension  465  in the lower gap Sa enables the ejection-side channel-forming component  45  to be supported from below in a radial direction of the nozzle cover  3 A, whereby the positioning of the ejection-side channel-forming component  45  can be performed. 
     As shown in  FIG.  9   , the ejection-side channel body  451  has therein the intra-nozzle ejection-side inner channel F 5 . The intra-nozzle ejection-side inner channel F 5  allows cleaning water, which has flowed through the interior of the ejection-side channel inner cylindrical wall  453  of the ejection-side channel body  451 , to pass mainly through a radially central portion of the ejection-side channel body  451 , and to reach the first water-ejection opening  454   a  of the first water-ejection protrusion  454 . 
     To assemble the nozzle  2 A, the ejection-side channel-forming component  45  of the channel-forming member  4 A is inserted into the nozzle cover  3 A through the open end of the nozzle cover  3 A. The ejection-side channel-forming component  45  is then moved toward the axially distal end until the ejection-side channel-forming component  45  reaches a location at which the first water-ejection protrusion  454  is ready to be fitted into the first though-hole  31 . Thereafter, the ejection-side channel-forming component  45  is moved upward to fit the first water-ejection protrusion  454  into the first though-hole  31 . 
     Next, the introduction-side channel-forming component  46  is inserted through the open end of the nozzle cover  3 A. Subsequently, the introduction-side channel distal-side cylindrical wall  462  of the introduction-side channel-forming component  46  is inserted into the ejection-side channel outer cylindrical wall  452  of the ejection-side channel-forming component  45 . 
     The rear end of the introduction-side channel-forming component  46  is fixed to the nozzle cover  3 A. For example, according to the present embodiment, the front surface of the flange  466  of the introduction-side channel-forming component  46  is positioned at a reference surface  381  formed at the rear end of the nozzle cover  3 A in the axial direction of the nozzle cover  3 A, and fixed to the nozzle cover  3 A by bonding. In another embodiment, the fixing may be achieved by press-fitting. 
     The above-described nozzle  2 A of the second embodiment provides the following advantages. In the nozzle  2 A of the present embodiment, the ejection-side channel-forming component  45  and the introduction-side channel-forming component  46  are arranged to be adjustable in position in the axial direction of the nozzle cover  3 A, while at least a portion of the ejection-side channel-forming component  45  overlays on at least a portion of the introduction-side channel-forming component  46  as viewed in a direction perpendicular to the axial direction of the nozzle cover  3 A. Thus, even if the nozzle cover  3 A is made of ceramic and the nozzle cover  3 A has a dimensional deviation in the axial direction caused by the manufacturing process, the dimensional deviation in the axial direction is canceled out and the positioning of the channel-forming member  4 A in the axial direction can be easily performed. Further, even if the ejection-side channel-forming component  45  and the introduction-side channel-forming component  46  have a dimensional deviation in the axial direction caused by the manufacturing process, the dimensional deviation in the axial direction is canceled out and the positioning of the channel-forming member  4 A in the axial direction can be easily performed. This feature makes it easy to assemble the nozzle  2 A. 
     According to the present embodiment, the nozzle cover  3 A has therein the gaps S 5  and S 6  which enable the ejection-side channel-forming component  45  and the introduction-side channel-forming component  46  to be adjusted in position in the axial direction of the nozzle cover  3 A. With this configuration, even if the nozzle cover  3 A, the ejection-side channel-forming component  45 , and the introduction-side channel-forming component  46  have a dimensional deviation in the axial dimension caused by the manufacturing process, the dimensional deviation in the axial direction is canceled out and the positioning of the channel-forming member  4 A in the axial direction can be easily performed. 
     Some embodiments of the present disclosure have been described in the foregoing. Note that the present disclosure is not limited to the embodiments described above, and modifications can be made as appropriate. 
     For example, in the first embodiment, the channel-forming member  4  is composed of the three channel-forming components (the ejection-side channel-forming component  41 , the introduction-side channel-forming component  42 , and the connection pipe  43 ). In the second embodiment, the channel-forming member  4 A is composed of the two channel-forming components (the ejection-side channel-forming component  45  and the introduction-side channel-forming component  46 ). However, these are non-limiting examples, and the channel-forming member may be composed of four or more channel-forming components. The channel-forming member  4  may exclude the connection pipe  43 . 
     In the above embodiment, the ejection-side channel-forming component  41  is embodied as a single component. However, this is a non-limiting example. The ejection-side channel-forming component  41  may be composed of two or more components. 
     In the above embodiments, the channel-forming member  4 ,  4 A includes therein a plurality of channels F 11 , F 12 , F 21 , F 22 , F 31 , F 32 , F 4 , and F 5 . However, the position where the channels pass and the number of the channels are not limited to those of the embodiments described above. 
     The first embodiment described above includes two water-ejection portions having a protruding shape (the first water-ejection protrusion  414 , the second water-ejection protrusion  415 ) and two water ejection openings (the first through-hole  31 , the second through-hole  32 ). The second embodiment described above includes one water-ejection portion having a protruding shape (the first water-ejection protrusion  454 ) and one water ejection opening (the first through-hole  31 ). However, these are non-limiting examples. For example, it is conceivable to provide three or more water-ejection portions having a protruding shape and three or more water ejection openings. 
     Unlike the embodiment described above, the surface of the first water-ejection protrusion  414  and the surface of the second water-ejection protrusion  415  may be below the surface of the nozzle cover  3 . 
     EXPLANATION OF REFERENCE NUMERALS 
     
         
           1 : Sanitary Cleaning Device 
           2 : Nozzle 
           3 : Nozzle Cover 
           4 : Channel-Forming Member 
           31 : First Through-Hole (Nozzle Cover-Side Water Ejection Opening) 
           32 : Second Through-Hole (Nozzle Cover-Side Water Ejection Opening) 
           41 : Ejection-Side Channel-Forming Component (Distal-Side Channel-Forming Component) 
           42 : Introduction-Side Channel-Forming Component (Rear-Side Channel-Forming Component) 
           43 : Connection Pipe (Rear-Side Channel-Forming Component) 
           45 : Ejection-Side Channel-Forming Component (Distal-Side Channel-Forming Component) 
           46 : Introduction-Side Channel-Forming Component (Rear-Side Channel-Forming Component) 
           381 : Reference Surface (Reference Position) 
           414 ,  454 : First Water-Ejection Protrusion (Water-Ejection Portion) 
           414   a ,  454   a : First Water-Ejection Opening (Channel-Side Water Ejection Opening) 
           415 : Second Water-Ejection Protrusion (Water-Ejection Portion) 
           415   a : Second Water-Ejection Opening (Channel-Side Water Ejection Opening) 
         S 1 , S 2 , S 3 , S 4 , S 5 , S 6 : Gap