Water closet

Abstract

To provide a water closet capable of suppressing the occurrence of notch breakage at an adhesive surface between a shank and a rim part.SOLUTION: A water closet according to an embodiment comprises a shank and a rim part bonded to a top edge of the shank. The water closet forms a bowl part by bonding the shank and the rim part. An adhesive surface between the shank and the rim part includes, at least in part, an inner inclined surface inclined toward an inside of the bowl part, and an adhesive surface enlarged part formed by a horizontal plane extending substantially horizontally from an inner end of the inner inclined surface toward the inside of the bowl part.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] SUMMARY OF THE INVENTION The disclosed embodiments relate to a flush toilet. [Background technology]

[0002] Conventionally, flush toilets in which the bowl is formed by bonding a body and a rim have been known. Flush toilets with an inclined surface as the bonding surface between the body and rim have been disclosed (see Patent Document 1 and Patent Document 3). Also disclosed is a flush toilet with a horizontal surface as the bonding surface between the body and rim (see Patent Document 2).

[0003] The material used to glue the body and rim together is called nota, which is made from the same material as the body and rim. After nota is applied to the top of the body, the body and rim are glued together. The flush toilet is then manufactured through a drying process in which the body and rim are dried, and a firing process in which the flush toilet is baked. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-80504 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-174450 [Patent Document 3] Japanese Patent Publication No. 2022-064619 Summary of the Invention [Problem to be solved by the invention]

[0005] In the conventional technology described above, during the manufacturing process after the body and rim are bonded together, stress applied to the bonding surface between the body and rim can sometimes cause cracks called knot cracks to form along the bonding surface between the body and rim.

[0006] One aspect of the embodiment has been made in light of the above, and aims to provide a flush toilet that can prevent the occurrence of cracks and rips on the adhesive surface between the body and rim. [Means for solving the problem]

[0007] A flush toilet according to one aspect of the embodiment comprises a body portion and a rim portion adhered to the upper end of the body portion, with the body portion and the rim portion adhering to form a bowl portion, and at least a portion of the adhesive surface between the body portion and the rim portion comprises an inner inclined surface that slopes toward the inside of the bowl portion, and an expanded adhesive surface portion formed by a substantially horizontal plane extending from the inner end of the inner inclined surface toward the inside of the bowl portion.

[0008] By forming horizontal and inclined surfaces in areas of the flush toilet where cracking is likely to occur, the effects of shrinkage of the body and rim during the drying and firing processes are reduced, making it possible to prevent cracking at the adhesive surface between the body and rim.

[0009] The enlarged adhesive surface portion is provided near the adhesive end portion between the body portion and the rim portion.

[0010] By forming horizontal and inclined surfaces at the adhesive edges where stress tends to concentrate, flush toilets can absorb stress concentrations at the adhesive edges. This allows the flush toilet to prevent the occurrence of rips and tears at the adhesive surface between the body and rim. Also, because the application of rips and tears begins at the adhesive edges of flush toilets, increasing the adhesive surface area near the adhesive edges makes it easier to apply the rips.

[0011] The enlarged adhesive surface portion is configured so that the horizontal surface decreases toward a portion where the adhesive surface between the body portion and the rim portion is formed only by the inner inclined surface.

[0012] The flush toilet can prevent the occurrence of rips and cracks due to stress concentration at the boundary between the enlarged adhesive surface portion and the portion where the enlarged adhesive surface portion is not provided.

[0013] The toilet also includes a rim nozzle that discharges wash water, and the enlarged adhesive surface portion is provided at a position where the rim nozzle is attached.

[0014] A flush toilet can be provided with an enlarged adhesive surface portion located away from the flow path of flush water. This makes it possible to reduce the effect of the enlarged adhesive surface portion on the rim water passage.

[0015] The inner surface of the enlarged adhesive surface portion is generally vertical or inclined toward the outside of the bowl portion as it extends upward.

[0016] The flush toilet maintains the draft angle of the mold used to form the body, so even if the flush toilet is provided with an enlarged adhesive surface portion, it does not affect the production efficiency of the flush toilet.

[0017] The body portion also has an inner wall that forms most of the bowl surface of the bowl portion, and an outer wall that forms the exterior surface, and the rim water passage through which cleaning water flows is formed by bonding the inner and outer walls of the body portion to the rim portion, respectively, and the bonding surface expansion portion is provided on the higher of the inner and outer walls of the body portion in the vertical direction.

[0018] Since flush toilets are prone to stress concentration at the higher vertical positions, the provision of an expanded adhesive surface on the higher vertical positions of the inner and outer walls of the body can help prevent cracks from forming.

[0019] The enlarged adhesive surface portion is provided on the outer wall of the body portion.

[0020] In a flush toilet, the body and rim can be easily positioned, and even if a tear occurs, it can be easily confirmed.

[0021] In addition, the inner end of the horizontal surface of the enlarged adhesive surface portion is located at the upper corner of the rim water passage.

[0022] In a flush toilet, the adhesive surface between the outer wall of the body and the rim is formed in a position higher than the inner edge of the horizontal surface of the expanded adhesive surface portion is located in any part of the rim water passage other than the upper corner.When the adhesive surface between the outer wall of the body and the rim is located in a position where stress concentration is likely to occur (a high position in the vertical direction), the occurrence of cracks can be suppressed. [Effects of the Invention]

[0023] According to one aspect of the embodiment, it is possible to suppress the occurrence of cracks and rips on the adhesive surface between the body portion and the rim portion. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 2 is a cross-sectional view of the center side of the toilet body of a flush toilet according to one embodiment of the present invention. [Figure 2] FIG. 1 is a plan view of a toilet body of a flush toilet according to an embodiment of the present invention. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 2 is a partially enlarged perspective view of the rear left portion of the toilet body of the flush toilet according to an embodiment of the present invention. [Figure 5] FIG. 2 is a partially enlarged perspective view of the rear right portion of the flush toilet body according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] Embodiments of the flush toilet disclosed in this application will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below.

[0026] First, the configuration of a flush toilet according to one embodiment of the present invention will be explained with reference to Figures 1 and 2. Figure 1 is a central side cross-sectional view of the toilet body 2 of a flush toilet 1 according to one embodiment of the present invention. Figure 2 is a plan view of the toilet body 2 of a flush toilet 1 according to one embodiment of the present invention.

[0027] 1 to 5, for ease of explanation, a three-dimensional Cartesian coordinate system including a Z-axis with the positive direction pointing vertically upward is illustrated. In the Cartesian coordinate system, the negative direction of the Y-axis is defined as the forward direction, the positive direction of the Y-axis as the backward direction, the positive direction of the X-axis as the left direction, and the negative direction of the X-axis as the right direction. Therefore, in the following explanation, the X-axis direction may be referred to as the left-right direction, the Y-axis direction as the front-back direction, and the Z-axis direction as the up-down direction.

[0028] As shown in Figures 1 and 2, a flush toilet 1 according to one embodiment of the present invention is equipped with a ceramic toilet body 2. The toilet body 2 consists of a body 4 and a rim 6 joined to the upper end of the body 4.

[0029] 1 and 2, a toilet seat and toilet lid are provided on the top surface of the toilet body 2. At the rear of the toilet body 2, functional parts such as a sanitary washing section that cleans the user's private parts and a water supply system function section that is involved in the water supply function to the toilet body 2 are provided, but these are not shown and will not be described here.

[0030] As shown in Figure 1, body 4 has an inner wall 12 that forms more than half (the majority) of the bowl surface inside body 4. Inner wall 12 forms waste receiving surface 8 and also forms shelf surface 10 outside upper edge 8a of waste receiving surface 8. The "outside" refers to the direction toward the opposite side from the center of bowl portion 20, which will be described later, in the horizontal direction, which is the direction of a plane including the X-axis and Y-axis. Note that the direction toward the center of bowl portion 20 in the horizontal direction, which is the direction of a plane including the X-axis and Y-axis, is referred to as the "inside."

[0031] The body 4 also includes an outer wall 14 that forms the exterior surface of the body 4, and a connecting portion 16 that connects the outer wall 14 and the inner wall 12. In the body 4, the inner wall 12, the outer wall 14, and the connecting portion 16 are integrally formed with one another.

[0032] The body 4 also has an inlet 24a connected to the bottom of the bowl 20, and a drain trap pipe 24 which is a drainage channel for discharging waste from within the bowl 20.

[0033] The rim portion 6 has an inner wall 18 that forms the rim inner wall surface, which is part of the bowl surface. When the lower end of the inner wall 18 of the rim portion 6 is joined to the upper end of the inner wall 12 of the body portion 4, the toilet body 2 forms a bowl portion 20. The toilet body 2 is designed so that the bowl surface is formed inside the toilet body 2 by the bowl portion 20.

[0034] Furthermore, when the lower end of the inner wall 18 of the rim portion 6 is joined to the upper end of the inner wall 12 of the body portion 4, and the outer edge of the rim portion 6 is joined to the upper end of the outer wall 14 of the body portion 4, a rim water passage 22 (see Figure 2) is formed that functions as part of the rim water discharge portion that discharges cleaning water into the bowl portion 20.

[0035] As shown in Figure 2, the rim water passage 22 is formed from the rear right side to the front right side of the toilet body 2. At the downstream end of the rim water passage 22 is formed a single rim water spout 26 which functions as part of the rim water spouting section which spouts flush water rearward into the bowl section 20 to form a swirling flow. In other words, the rim water spouting section is provided in the rim section 6 and forms one rim water spouting section 26 around the entire circumference of the rim section 6 which spouts flush water.

[0036] Furthermore, the upstream side of the rim water passage 22 is connected to a rim nozzle 28. The upstream side of the rim nozzle 28 is directly connected to a water mains (not shown), which is the flush water source. Using the water supply pressure of the water mains, flush water is discharged from the rim nozzle 28 into the rim water passage 22, which is led forward within the rim water passage 22, before bending inward and rearward and being led to the rim water outlet 26 on the downstream side. The flush water led to the rim water outlet 26 is then discharged rearward (rim spouting), and swirls within the bowl section 20, creating a swirling flow within the bowl section 20.

[0037] The flush toilet 1 of this embodiment has a configuration in which the rim water passage 22 is provided inside the rim portion 6 on the right side of the bowl portion 20, and a single rim spout 26 is formed on the inner periphery of the rim portion 6 on the front side of the bowl portion 20. However, the flush toilet 1 is not limited to this configuration, and may have another configuration in which the rim water passage 22 is provided inside the rim portion 6 on the left side of the bowl portion 20, and a single rim spout 26 is provided on the inner periphery of the rim portion 6 on the front side of the bowl portion 20, with water being spouted rearward from the rim spout 26 (rim spouting).

[0038] Furthermore, as shown in Figure 1, a jet water outlet 30 is formed at the bottom of the bowl portion 20 so as to be directed toward the inlet portion 24a of the drain trap pipe line 24, and water is also discharged (jet water) from the water supply system function portion (not shown) through the jet water outlet 30.

[0039] The flush toilet 1 of this embodiment is a so-called hybrid flush toilet, in which the rim spouting from the rim spout 26 uses the water supply pressure of the mains, and the jet spouting from the jet spout 30 supplies flush water from a water storage tank (not shown) by controlling a pressure pump (not shown). However, the flush toilet 1 is not limited to this configuration, and can be applied to other configurations as well. The flush toilet 1 may also be configured in such a way that the jet spouting from the jet spout 30 is omitted.

[0040] Next, the adhesive surface between the body 4 and rim 6 of a flush toilet 1 according to one embodiment of the present invention will be described in detail with reference to Figures 1 to 5. Figure 3 is a cross-sectional view taken along line III-III in Figure 2. Figure 4 is a partially enlarged perspective view of the rear left side of the toilet body 2 of a flush toilet 1 according to one embodiment of the present invention. Figure 5 is a partially enlarged perspective view of the rear right side of the toilet body 2 of a flush toilet 1 according to one embodiment of the present invention.

[0041] As shown in Figure 3, the toilet body 2 has an adhesive surface S1 between the upper end of the inner wall 12 of the body 4 and the lower end of the inner wall 18 of the rim 6. The toilet body 2 also has an adhesive surface S2 between the upper end of the outer wall 14 of the body 4 and the upper wall 34 of the rim 6. When the body 4 and the rim 6 are adhered at adhesive surface S1 and adhesive surface S2, the rim water passage 22 is formed by being surrounded by the inner wall 18 and outer wall 36 of the rim 6, the connecting portion 38 connecting the outer wall 36 and inner wall 18, the upper wall 34, and the inner wall 12, outer wall 14 and connecting portion 16 of the body 4.

[0042] The adhesive surface S2 between the body 4 and the rim 6 comprises an inner inclined surface S2a and an expanded adhesive surface portion S2b. The inner inclined surface S2a is formed, for example, so as to slope downward from the side surface 5 of the outer wall 14 of the body 4 toward the inside of the bowl 20. The expanded adhesive surface portion S2b is formed, for example, by a substantially horizontal plane that extends from the inner end of the inner inclined surface S2a toward the inside of the bowl 20 to the rim water passage 22. Note that the expanded adhesive surface S2b may also be inclined upward toward the inside of the bowl 20 (reverse inclination). This allows the flush toilet 1 to be configured to prevent dripping from the adhesive surface S2, making it easier to apply.

[0043] As shown in Figure 2, the adhesive surface S2 between the body 4 and the rim 6 is formed in a roughly U-shape in plan view. Enlarged adhesive surface portions S2b are provided near both ends of the adhesive surface S2 at the rear of the toilet body 2. In other words, enlarged adhesive surface portions S2b are provided near the adhesive ends between the body 4 and the rim 6. Here, the nota is applied from both ends of the adhesive surface S2 towards the center, as shown by arrow A. Therefore, the flush toilet 1 is configured to make it easier to apply the nota by forming a large adhesive surface at the starting point where the nota is applied.

[0044] 4 and 5, the enlarged adhesive surface portion S2b is formed so that the width of the horizontal plane gradually decreases from the rear to the front of the body 4 (to the front end 17 of the enlarged adhesive surface portion S2b). In other words, the enlarged adhesive surface portion S2b is formed so that the horizontal plane decreases toward the portion where the adhesive surface between the body 4 and the rim portion 6 is formed only by the inner inclined surface S2a (the portion where the enlarged adhesive surface portion S2b is not provided). The width of the horizontal plane is not particularly limited, and may be formed so that it decreases quadratically from the rear to the front of the body 4, or may be configured so that it reaches zero partway through the decrease (so that the enlarged adhesive surface portion S2b is not formed).

[0045] As shown in Figure 2, enlarged adhesive surface portion S2b is provided in a position where the rim nozzle 28 is attached. The rim nozzle 28 is arranged so that flush water is spouted from the rim nozzle spout 29 of the rim nozzle 28 towards the front of the toilet body 2. Enlarged adhesive surface portion S2b is arranged, for example, to be located to the right side of the rim nozzle spout 29 of the rim nozzle 28. This makes it possible to position enlarged adhesive surface portion S2b so that it is not positioned in the direction from which flush water is spouted. Note that if the flow path of the rim water passage 22 is formed by another structure such as a distributor, enlarged adhesive surface portion S2b is provided in a position where the distributor is attached.

[0046] As shown in Figure 3, the inner surface S4 of the expanded adhesive surface portion S2b is connected so as to smoothly merge with the bottom surface S3 of the rim water passage 22, and is formed approximately vertically on the outside of the rim water passage 22. Alternatively, the inner surface S4 of the expanded adhesive surface portion S2b may be inclined towards the outside of the bowl portion 20 as it moves towards the upper side of the inner surface S4. The molding die (upper die) that forms the body portion 4 is removed towards the upper side of the body portion 4 after the body portion 4 has been molded. Therefore, in the flush toilet 1, the inner surface S4 of the expanded adhesive surface portion S2b is formed so that the molding die that formed the body portion 4 can be removed towards the upper side.

[0047] The expanded adhesive surface portion S2b is provided on the higher one of the inner wall 12 and the outer wall 14 of the body 4 in the vertical direction. In this embodiment, the upper end of the outer wall 14 is formed at a position higher in the vertical direction than the upper end of the inner wall 12, and therefore the expanded adhesive surface portion S2b is provided on the upper end of the outer wall 14.

[0048] Additionally, expanded bonding surface portion S2b is formed by a substantially horizontal plane that extends from the inner end of inner inclined surface S2a towards the inside of bowl portion 20 to rim water passage 22. Expanded bonding surface portion S2b is located at the upper end of rim water passage 22, forming an upper corner 23 of rim water passage 22. Therefore, corner 23 of rim water passage 22 has one side formed by upper wall 34 of rim portion 6, and the other side of corner 23 formed by outer wall 14 of body portion 4.

[0049] As described above, the flush toilet 1 according to the embodiment comprises a body 4 and a rim 6 that is bonded to the upper end of the body 4, and the body 4 and rim 6 are bonded together to form the bowl 20, and at least a portion of the bonding surface between the body 4 and the rim 6 comprises an inner inclined surface S2a that slopes toward the inside of the bowl 20, and an expanded bonding surface portion S2b that is formed by a substantially horizontal plane that extends from the inner end of the inner inclined surface S2a toward the inside of the bowl 20.

[0050] By forming horizontal and inclined surfaces in areas of the flush toilet 1 where cracks are likely to occur, the effects of shrinkage of the body 4 and rim 6 during the drying and firing processes are reduced. This makes it possible for the flush toilet 1 to prevent cracks from occurring on the adhesive surface between the body 4 and rim 6.

[0051] The enlarged adhesive surface portion S2b is provided in the vicinity of the adhesive end portion between the body portion 4 and the rim portion 6.

[0052] By forming horizontal and inclined surfaces at the bonded edges where stress tends to concentrate, the flush toilet 1 is able to absorb stress concentration at the bonded edges. This allows the flush toilet 1 to prevent the occurrence of notching at the bonded surface between the body 4 and rim 6. As notching begins to be applied to the flush toilet 1 from the bonded edges, increasing the bonded surface area near the bonded edges makes it easier to apply notching.

[0053] The enlarged bonding surface portion S2b is configured so that the horizontal surface decreases toward the portion where the bonding surface between the body portion 4 and the rim portion 6 is formed only by the inner inclined surface S2a.

[0054] The flush toilet 1 can prevent the occurrence of rips and cracks due to stress concentration at the boundary between the enlarged adhesive surface portion S2b and the area where the enlarged adhesive surface portion S2b is not provided.

[0055] It also has a rim nozzle 28 that spouts cleansing water, and the enlarged adhesive surface portion S2b is provided at a position where the rim nozzle 28 is attached.

[0056] The flush toilet 1 can be provided with the enlarged adhesive surface portion S2b so that it is separated from the flow path of flush water. This allows the flush toilet 1 to reduce the impact of the enlarged adhesive surface portion S2b on the rim water passage 22.

[0057] The inner surface S4 of the enlarged adhesive surface portion S2b is substantially vertical or inclined toward the outside of the bowl portion 20 as it approaches the upper side of the inner surface S4.

[0058] The flush toilet 1 maintains the draft angle of the mold used to form the body 4. As a result, even if the flush toilet 1 is provided with the enlarged adhesive surface portion S2b, it does not affect the production efficiency of the flush toilet 1.

[0059] The body 4 also has an inner wall 12 that forms most of the bowl surface of the bowl portion 20, and an outer wall 14 that forms the exterior surface, and the rim water passage 22 through which the flushing water flows is formed by bonding the inner wall 12 and outer wall 14 of the body 4 to the rim portion 6, respectively, and an expanded bonding surface portion S2b is provided on the higher of the inner wall 12 and outer wall 14 of the body 4 in the vertical direction.

[0060] Since flush toilet 1 is prone to stress concentration at the higher vertical positions, the occurrence of cracks can be suppressed by providing enlarged adhesive surface portion S2b at the higher vertical positions of inner wall 12 and outer wall 14 of body 4.

[0061] The expanded adhesive surface portion S2b is provided on the outer wall 14 of the body portion 4.

[0062] In the flush toilet 1, the body 4 and rim 6 can be easily positioned, and even if a tear occurs, it can be easily confirmed.

[0063] The inner end of the horizontal surface of the expanded bonding surface portion S2b is located at the upper corner 23 of the rim water passage 22.

[0064] In the flush toilet 1, the adhesive surface S2 between the outer wall 14 of the body 4 and the rim 6 is formed in a position higher than the position where the inner edge of the horizontal surface of the expanded adhesive surface portion S2b is located other than at the upper corner 23 of the rim water passage 22. In the flush toilet 1, the adhesive surface between the outer wall 14 of the body 4 and the rim 6 is located in a position where stress concentration is likely to occur (a high position in the vertical direction), making it possible to prevent cracks from occurring.

[0065] Further advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

[0066] <Additional Notes> (1) a body portion and a rim portion bonded to an upper end of the body portion, A flush toilet in which the body portion and the rim portion are bonded together to form a bowl portion, A flush toilet in which the adhesive surface between the body portion and the rim portion is at least partially provided with an inner inclined surface that slopes toward the inside of the bowl portion, and an expanded adhesive surface portion formed by a substantially horizontal surface that extends from the inner end of the inner inclined surface toward the inside of the bowl portion. (2) The flush toilet according to (1), wherein the enlarged adhesive surface portion is provided near the adhesive end portion between the body portion and the rim portion. (3) The flush toilet according to (1) or (2), wherein the enlarged adhesive surface portion is configured so that the horizontal surface decreases toward the portion where the adhesive surface between the body portion and the rim portion is formed solely by the inner inclined surface. (4) Equipped with a rim nozzle that sprays cleaning water, The flush toilet according to any one of (1) to (3), wherein the enlarged adhesive surface portion is provided at a position where the rim nozzle is attached. (5) A flush toilet according to any one of (1) to (4), wherein the inner surface of the enlarged adhesive surface portion is substantially vertical or slopes toward the outside of the bowl portion as it moves toward the upper side of the inner surface. (6) The body portion has an inner wall that forms a majority of the bowl surface of the bowl portion and an outer wall that forms an exterior surface, a rim water passage through which flush water flows is formed by bonding an inner wall and an outer wall of the body portion to the rim portion, A flush toilet according to any one of (1) to (5), wherein the expanded adhesive surface portion is provided on one of the inner and outer walls of the body portion that is higher in the vertical direction. (7) The flush toilet according to (6), wherein the enlarged adhesive surface portion is provided on the outer wall of the body portion. (8) A flush toilet according to (7), wherein the inner end of the horizontal surface of the enlarged adhesive surface portion is located at an upper corner of the rim water passage. [Explanation of symbols]

[0067] 1 flush toilet 4. Torso 6 Rim 12 Inner wall 14 Outer wall 20 Bowl section 22 Rim Aqueduct 23 Corner 28 Rim Nozzle S1 Adhesive surface S2 Adhesive surface S2a Inner inclined surface S2b Expanded adhesive surface S4 inner surface

Claims

1. a body portion and a rim portion bonded to an upper end of the body portion, A flush toilet in which the body portion and the rim portion are bonded together to form a bowl portion, A flush toilet in which the adhesive surface between the body portion and the rim portion is at least partially provided with an inner inclined surface that slopes toward the inside of the bowl portion, and an expanded adhesive surface portion formed by a substantially horizontal surface that extends from the inner end of the inner inclined surface toward the inside of the bowl portion.

2. 2. The flush toilet according to claim 1, wherein the enlarged adhesive surface portion is provided near the adhesive end portion between the body portion and the rim portion.

3. 2. The flush toilet according to claim 1, wherein the enlarged bonding surface portion is configured so that the horizontal surface decreases toward the portion where the bonding surface between the body portion and the rim portion is formed solely by the inner inclined surface.

4. Equipped with a rim nozzle that sprays cleaning water, The flush toilet according to claim 1, wherein the enlarged adhesive surface portion is provided at a position where the rim nozzle is attached.

5. 2. The flush toilet according to claim 1, wherein the inner surface of the enlarged adhesive surface portion is substantially vertical or slopes toward the outside of the bowl portion as it moves upward.

6. The body portion has an inner wall that forms a majority of the bowl surface of the bowl portion and an outer wall that forms an exterior surface, a rim water passage through which flush water flows is formed by bonding an inner wall and an outer wall of the body portion to the rim portion, 2. The flush toilet according to claim 1, wherein the expanded adhesive surface portion is provided on one of the inner and outer walls of the body portion that is higher in the vertical direction.

7. The flush toilet according to claim 6, wherein the enlarged adhesive surface portion is provided on the outer wall of the body portion.

8. The flush toilet according to claim 7, wherein the inner end of the horizontal surface of the enlarged adhesive surface portion is located at an upper corner of the rim water passage.

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