Unit mounting structure

Abstract

To improve workability when a unit is assembled to a case part in an attachment structure of a unit attached to an evaporative fuel processing device.SOLUTION: One aspect of the disclosure relates to an attachment structure of a unit attached to an evaporative fuel processing device. The unit attachment structure includes: an opening, a pair of slits, and first engagement portions which are located in the unit; and projection parts and second engagement portions located in the unit. The first engagement portions are disposed between the pair of slits. Each second engagement portion is configured to be engageable with the first engagement portion on facing surfaces. When an axis along a direction in which the unit is inserted into the case part is set as a rotation axis and a direction around the rotation axis is set to a circumferential direction, at lest one of the pair of slits and the projection parts includes an inclined surface which is configured to be along the circumferential direction.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a mounting structure for a unit to be attached to an evaporated fuel treatment device. [Background technology]

[0002] The following Patent Document 1 discloses a structure that employs a snap-fit ​​structure as the mounting structure for the above-mentioned unit. In this snap-fit ​​structure, a slit and an engaged part are formed in a case part to which the unit is attached, and the unit is provided with an engaging part that engages with the engaged part. The unit also has a protrusion for suppressing wobbling (so-called rattling) relative to the case part. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-106712 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the configuration of Patent Document 1, when the unit is assembled to the case, if the unit is rotated with respect to the direction of insertion into the case, the protrusion of the unit will mistakenly fit into the slit of the case, making it difficult to remove. In other words, there is a problem in that the workability of assembling the unit to the case is poor.

[0005] One aspect of the present disclosure is to provide an attachment structure for a unit to be attached to an evaporated fuel treatment device, which provides improved workability when assembling the unit to a case portion. [Means for solving the problem]

[0006] One aspect of the present disclosure is a mounting structure for a unit to be mounted on an evaporated fuel processing device. The mounting structure for the unit includes a case portion and a unit. The unit is mounted in the case portion. The case portion includes an opening, a pair of slits, and a first engagement portion. The opening is configured to open at an end face opposite to the bottom portion. The pair of slits extend from the end face toward the bottom portion. The first engagement portion is disposed between the pair of slits. The unit includes a convex portion and a second engagement portion, with an outer peripheral surface of the unit facing the pair of slits as an opposing surface. The convex portion is configured to protrude from the opposing surface. The second engagement portion is configured to be able to engage with the first engagement portion at the opposing surface. An axis along the insertion direction of the unit into the case portion is defined as a rotation axis, and a direction around the rotation axis is defined as a circumferential direction, and at least one of the pair of slits and the convex portion includes an inclined surface that is a surface configured to follow the circumferential direction.

[0007] With this configuration, even if the protrusion is mistakenly caught in the slit when assembling the unit to the case, the inclined surface functions to release the protrusion from the slit, making it easier for the protrusion to come out of the slit. This improves the workability when assembling the unit to the case.

[0008] In one aspect of the present disclosure, the inclined surface may be provided in a region of the slit through which the protrusion passes when transitioning from the fitted state to the normal state. Note that when the unit is mounted in the case, a state in which the inner surface of the case in which the slit is provided is parallel to the opposing surface is defined as the normal state, and a state in which the unit rotates in the circumferential direction from the normal state and the protrusion is fitted into the slit is defined as the fitted state.

[0009] According to this configuration, an inclined surface is provided in the area of ​​the slit through which the protrusion passes when transitioning from the fitted state to the normal state, so that the protrusion can be easily removed from the slit.

[0010] In one aspect of the present disclosure, the case portion may further include a protrusion configured to extend from the bottom side toward the opening side and protrude from an inner surface of the case portion. According to this configuration, the protrusion suppresses rotation of the unit, thereby suppressing rattling of the unit relative to the case portion.

[0011] In one aspect of the present disclosure, the amount of protrusion from the inner surface of the protruding portion may be set to be smaller than the amount of protrusion from the outer circumferential surface of the convex portion. According to this configuration, the amount of protrusion of the protruding portion is smaller than the amount of protrusion of the convex portion, so that it is possible to suppress the protruding portion from adversely affecting the operability when inserting the unit into the case portion.

[0012] In one aspect of the present disclosure, the protrusion may be configured such that the amount of protrusion from the inner surface decreases toward the opening side. With this configuration, the amount that the protrusion protrudes from the inner surface decreases as it moves toward the opening, making it less likely that the end of the unit will get caught on the protrusion when inserting the unit into the case portion.

[0013] In one aspect of the present disclosure, when the unit is mounted within the case portion, the convex portion and the inclined surface may be positioned such that they do not overlap at least in part when the convex portion and the slit are viewed from a direction perpendicular to the opposing surface.

[0014] According to such a configuration, when the unit is mounted inside the case (that is, in the normal state), it is possible to make it difficult for the convex portion to get caught on the inclined surface. [Brief description of the drawings]

[0015] [Figure 1] 1 is a perspective view showing an evaporated fuel treatment device according to an embodiment; [Diagram 2] FIG. 2 is a perspective view showing the evaporated fuel treatment device with the unit removed. [Diagram 3] FIG. 2 is a perspective view showing the evaporated fuel treatment device with a unit and a joint portion removed. [Figure 4]FIG. 4A is a perspective view of the unit and the unit case assembled together, FIG. 4B is a perspective view of the unit case, and FIG. 4C is a perspective view of the unit. [Diagram 5] FIG. 5A is a plan view showing an example of positional misalignment between the unit and the unit case during left rotation, and FIG. 5B is a plan view showing an example of positional misalignment between the unit and the unit case during right rotation. [Figure 6] 13 is an enlarged view showing an example of misalignment between a unit and a unit case. FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII showing the positions of the inclined portions and the convex portions. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII, showing the positions of the inclined portion and the convex portion. [Figure 9] FIG. [Figure 10] FIG. 13 is an enlarged view showing a convex portion of a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of one aspect of the present disclosure will be described with reference to the drawings. [1. Embodiment] [1-1. Outline configuration] The evaporated fuel processing device 1 shown in Figs. 1 to 3 has a function as a known canister. That is, it has a function of adsorbing and desorbing evaporated fuel generated in a fuel tank (not shown) of a vehicle. The evaporated fuel processing device 1 has a main body case 2, a unit case 30 (corresponding to an example of a case portion in the present disclosure), a joint portion 50, and a unit 60. The unit 60 is attached to the unit case 30. Note that the evaporated fuel processing device 1 shown in Fig. 2 shows a state in which the unit 60 has been removed from the unit case 30, and the evaporated fuel processing device 1 shown in Fig. 3 shows a state in which the unit 60, the unit case 30, and the joint portion 50 have been removed from the main body case 2.

[0017] The main body case 2 is a case that forms an internal space. The main body case 2 is a case made of, for example, synthetic resin. However, the material of the main body case 2 is not limited to this. An adsorbent (not shown) made of activated carbon or the like is disposed inside the main body case 2.

[0018] The main body case 2 has a charge port 21, a purge port 22, and an atmospheric port 23. These ports are arranged on the same side of the main body case 2 so as to face the same direction. Hereinafter, the side of the main body case 2 on which the charge port 21, the purge port 22, and the atmospheric port 23 are provided will be referred to as the port side. In addition, the main body case 2 has an opening 26 on the side opposite the port side. The opening 26 is closed by a lid member 27.

[0019] The charge port 21 is connected to a fuel tank of the vehicle by a pipe and is configured to take in the evaporated fuel processing device 1 the evaporated fuel generated in the fuel tank.

[0020] The purge port 22 is connected to an intake pipe (not shown) of an engine of a vehicle via a purge valve. The purge port 22 is configured to discharge the evaporated fuel in the evaporated fuel processing device 1 from the evaporated fuel processing device 1 and supply it to the engine.

[0021] The atmospheric port 23 is connected to a fuel filler port (not shown) of the vehicle via a pipe and is open to the atmosphere. The atmospheric port 23 releases gas from which evaporated fuel has been removed into the atmosphere. The atmospheric port 23 also takes in outside air (i.e., purged air) to desorb (i.e., purge) the evaporated fuel adsorbed by the evaporated fuel processing device 1.

[0022] The unit case 30 is connected to the atmospheric port 23 while ensuring airtightness via a joint 50. The joint 50 is a pipe that connects the atmospheric port 23 and the unit case 30.

[0023] The unit case 30 is configured in a cylindrical shape with a bottom, as shown in Fig. 2. The unit case 30 has an inner peripheral surface 30A having a substantially rectangular parallelepiped shape, and an internal space is formed with the bottom 41 on the joint part 50 side. The inner peripheral surface 30A has a shape that fits along the outer peripheral surface of the unit 60 to be attached.

[0024] The bottom 41 is provided with a hole 42 that communicates with the joint 50. The unit case 30 has an opening 31 formed in the end face opposite the joint 50. The unit 60 is inserted from the opening 31, and in the normal state, which represents the state in which the unit 60 is correctly attached to the unit case 30, the unit 60 and the hole 42 are arranged in close contact with each other with no gaps.

[0025] The unit 60 is configured in a multi-faceted structure having multiple outer peripheral surfaces parallel to the insertion direction. The unit 60 of this embodiment is configured in a substantially four-faceted structure having approximately four outer peripheral surfaces. The unit 60 is configured, for example, as an ELCM (i.e., an Evaporative Leak Check Module). The ELCM is a module for performing a leak check of the evaporated fuel processing device 1. The ELCM includes at least a pump for creating a negative pressure inside the main body case 2.

[0026] In the leak inspection of the evaporated fuel processing device 1, the pump provided in the unit 60 is driven at a predetermined timing while the engine is stopped, and the air inside the main body case 2 is discharged into the atmosphere. This creates a negative pressure inside the main body case 2. Then, the presence or absence of a leak in the evaporated fuel processing device 1 is confirmed by monitoring the pressure change inside the main body case 2 at this time for a predetermined period of time.

[0027] It should be noted that unit 60 is not limited to an ELCM. For example, unit 60 may be configured as a sub-canister that includes the same or a different adsorbent inside unit 60, separate from the adsorbent inside main body case 2. Alternatively, unit 60 may be configured as another type of unit.

[0028] [1-2. Unit mounting structure] The unit 60 is attached to the unit case 30 using a unit mounting structure 5 shown in Fig. 4A and subsequent figures. The mounting structure 5 connects the unit case 30 and the unit 60 with a snap-fit ​​structure. That is, the mounting structure 5 includes a pair of slits 32A, 32B and first engagement portions 34A, 34B in the unit case 30, and second engagement portions 64A, 64B in the unit 60. The first engagement portions 34A, 34B and the second engagement portions 64A, 64B are configured to be able to engage with each other. The mounting structure 5 may further include an opening 31 in the unit case 30 and protrusions 62A to 62C in the unit 60.

[0029] As shown in FIG. 4B, the opening 31 is a portion configured to open at the end face of the unit case 30 opposite to the bottom part 41. The pair of slits 32A and 32B respectively constitute a pair of slits 32A and 32B. That is, the pair of slits 32A includes a first slit and a second slit, and similarly, the pair of slits 32B includes a first slit and a second slit. The first slit and the second slit of the pair of slits 32A and the first slit and the second slit of the pair of slits 32B are different slits provided separately. Hereinafter, when expressing "the first slit or the second slit of the pair of slits 32A and 32B" and when expressing "at least one of the first slit and the second slit constituting the pair of slits 32A and 32B", they are simply written as slits 32A and 32B.

[0030] The pair of slits 32A are formed in a first outer wall 36A among the outer walls erected to surround the bottom 41 of the unit case 30. The pair of slits 32B are formed in a second outer wall 36B opposed to the first outer wall 36A. Each of the slits 32A, 32B is configured to extend from an end on the opening 31 side toward the bottom 41 side.

[0031] The first engagement portions 34A, 34B are disposed between the respective pairs of slits 32A, 32B (i.e., between the first slit and the second slit) in the first outer wall 36A and the second outer wall 36B. The first engagement portions 34A, 34B are formed as recesses (holes in this case) recessed from the inner circumferential surface 30A side toward the outside.

[0032] As shown in Figures 4C, 5A, and 5B, the second engagement parts 64A, 64B of the unit 60 are configured to be able to engage with the first engagement parts 34A, 34B at opposing surfaces 61A, 61B. The opposing surfaces 61A, 61B are outer peripheral surfaces that face the slits 32A, 32B of the outer peripheral surface 60A of the unit 60 when the unit 60 is attached to the unit case 30, in other words, outer peripheral surfaces that face the outer walls 36A, 36B. The second engagement parts 64A, 64B are configured as convex parts that are able to engage with the first engagement parts 34A, 34B.

[0033] The protruding portions 62A to 62C are configured separately from the second engagement portions 64A and 64B, and are portions configured to protrude from the opposing surface 61. With this configuration, when the unit 60 is inserted into the unit case 30, the portion between the pair of slits 32A, 32B in the outer walls 36A, 36B is pushed by the second engagement portions 64A, 64B and bent toward the outside of the unit case 30. Then, when the second engagement portions 64A, 64B fit into the first engagement portions 34A, 34B, the bending of the portion is released and the engagement state between the first engagement portions 34A, 34B and the second engagement portions 64A, 64B is maintained. In other words, the unit 60 is fixed to the unit case 30.

[0034] At this time, the opposing surfaces 61A, 61B of the unit 60 and the outer walls 36A, 36B of the unit case 30 are parallel to each other. This state is called a normal state. Here, as shown in Figures 4A and 5B, an axis along the insertion direction of the unit 60 into the unit case 30 is defined as a rotation axis P, and a direction around the rotation axis P is defined as a circumferential direction R. When the unit 60 is inserted into the unit case 30 in a rotated state in the circumferential direction as shown in Figures 5A and 5B, the convex portions 62A to 62C may get stuck in the slits 32A and 32B as shown in Figures 5A and 6, making it difficult to remove. This state is called a fitted state. Note that even if the unit 60 does not reach the fitted state, a state in which the unit 60 is rotated in the circumferential direction R from the normal state is called a non-normal state.

[0035] In the configuration of this embodiment, the heights of the protrusions 62A to 62C (i.e., the amount of protrusion from the opposing surfaces 61A, 61B) are configured such that the height of the protrusion 62A is greater than the height of the protrusion 62B, and the height of the protrusion 62C is greater than the height of the protrusion 62B. Therefore, of the protrusions 62A to 62C, the protrusions 62A and 62C are more likely to get caught in the slits 32A and 32B.

[0036] A predetermined clearance is provided between the unit 60 and the unit case 30. The unit 60 can be rotated in the circumferential direction R relative to the unit case 30 according to the size of the clearance, with the rotation axis P being an area (center area O) near the center of the unit case 30 in the insertion direction of the unit 60. The center area O indicates an area where the rotation axis P may exist when the unit 60 rotates, and the range of the center area O is determined by the shape of the unit 60 and the size of the clearance. In the example shown in Figs. 5A and 5B, when the unit 60 is viewed in the insertion direction, the center area O is an area near the centroid of the unit case 30 (for example, the intersection of diagonals).

[0037] Here, in the fitted state and the non-standard state, the unit 60 rotates in the circumferential direction R with respect to the standard state, and the opposing surfaces 61A, 61B of the unit 60 and the outer walls 36A, 36B of the unit case 30 are not parallel to each other.

[0038] In this embodiment, a measure is taken to eliminate the fitted state and the non-standard state and to transition to the standard state. First, as shown in Fig. 6 etc., the slit 32A has an inclined surface 33. The inclined surface 33 is a surface configured to extend along the circumferential direction. The inclined surface 33 needs to be provided only in the slits 32A, 32B into which the convex portions 62A to 62C are likely to fit, and in this embodiment, the inclined surface 33, which is a flat surface, is disposed in only one slit 32A. Note that the inclined surface 33 is not limited to a flat surface, and may be a curved surface.

[0039] Further, the inclined surface 33 is provided in the area of ​​the slits 32A and 32B through which the convex portions 62A to 62C pass when transitioning from the fitted state to the normal state. For example, in the example of FIG. 5A, the unit 60 rotates leftward from the normal state, and as a result, the convex portion 62A fits into the slit 32A. In order to transition the unit 60 to the normal state, the unit 60 needs to be rotated rightward, and at this time, the convex portion 62A moves leftward. For this reason, the inclined surface 33 is provided on the left side of the slit 32A, which is the area through which the convex portion 62A passes. According to this configuration, the inclined surface 33 prevents the convex portion 62A from getting caught in the slit 32A, so that the convex portion 62A can be easily removed from the slit 32A.

[0040] The unit case 30 further includes a protrusion 36. The protrusion 36 extends from the bottom 41 side toward the opening 31 side, in other words, extends from the opening 31 side toward the bottom 41 side, and is configured to protrude from the inner peripheral surface 30A of the unit case 30. The protrusion 36 is provided at a portion of the inner peripheral surface 30A of the unit case 30 that may collide with the outer peripheral surface 60A of the unit 60 when in an irregular state. However, in this embodiment, an example in which only one protrusion 36 is provided is illustrated. Note that the protrusion 36 does not need to extend to a position that reaches the opening 31.

[0041] Here, for example, when it is assumed that the unit 60 rotates leftward from the normal state, the portions that may collide with the outer peripheral surface 60A are four regions, 38A, 38B, 38C, and 38D, shown in FIG. 5A. The regions 38A to 38D are the regions when the four corners of the inner peripheral surface 30A of the unit case 30 rotate slightly left along the circumferential direction R. Also, for example, when it is assumed that the unit 60 rotates rightward from the normal state, the portions that may collide with the outer peripheral surface 60A are four regions, 38E, 38F, 38G, and 38H, shown in FIG. 5B. The regions 38E to 38H are the regions when the four corners of the inner peripheral surface 30A of the unit case 30 rotate slightly right along the circumferential direction R. The protrusion 36 may be provided in all or part of these regions.

[0042] The protrusions 62A to 62C and the slits 32A and 32B are arranged so as not to overlap at least partially when viewed from a predetermined direction. The predetermined direction is, for example, a direction in which the protrusions 62A and the slits 32A are viewed from a cross section along the slit 32A as shown in Fig. 7, or a direction in which the protrusions 62A and the slits 32A are viewed from a direction perpendicular to the opposing surface 61 along the rotation axis P as shown in Fig. 8.

[0043] It is sufficient that the region LA where the inclined surface 33 is arranged and the region LB where the convex portion 62A is arranged are arranged so as not to overlap at least partially. As shown in Fig. 7, the region LA and the region LB are configured so as to overlap partially but not to overlap partially. Also, as shown in Fig. 8, the region LC where the inclined surface 33 is arranged and the region LD where the convex portion 62A is arranged are configured so as not to overlap at all.

[0044] Further, the amount of protrusion H2 (see FIG. 9) of protrusion 36 from inner circumferential surface 30A is set to be smaller than the amount of protrusion H1 (see FIG. 6) of protrusions 62A-62C from outer circumferential surface 60A. Further, as shown in FIG. 9, protrusion 36 has tapered surface 37 such that the amount of protrusion H2 from inner circumferential surface 30A decreases toward opening 31. This is to improve ease of insertion by making it difficult for the end of unit 60 to get caught on protrusion 36 when unit 60 is inserted into unit case 30.

[0045] [1-3. Effects] According to the embodiment described above in detail, the following effects are achieved.

[0046] (1a) In the above mounting structure 5, the slits 32A, 32B have an inclined surface 33 that is a surface configured to extend along the circumferential direction R. According to this configuration, even if the protrusions 62A-62C are erroneously fitted into the slits 32A, 32B when assembling the unit 60 to the unit case 30, the inclined surface 33 functions to release the protrusions 62A-62C from being caught in the slits 32A, 32B. This makes it easier for the protrusions 62A-62C to come out of the slits 32A, 32B. This improves the workability when assembling the unit 60 to the unit case 30.

[0047] (1b) In one embodiment of the present disclosure, the inclined surfaces 33 are provided in the slits 32A and 32B in areas through which the convex portions 62A to 62C pass when transitioning from the fitted state to the normal state. According to such a configuration, the inclined surface 33 is provided in the area of ​​the slits 32A, 32B through which the convex portions 62A-62C pass when transitioning from the fitted state to the normal state, so that the convex portions 62A-62C can be easily removed from the slits 32A, 32B.

[0048] (1c) In one embodiment of the present disclosure, the unit case 30 further includes a protrusion 36 configured to extend from the bottom 41 side toward the opening 31 side and protrude from the inner surface of the unit case 30. According to such a configuration, the protrusion 36 restricts the rotation of the unit, so that rattling of the unit relative to the case can be restricted.

[0049] (1d) In one embodiment of the present disclosure, the unit 60 is configured to have a multi-faceted structure having multiple outer circumferential surfaces parallel to the insertion direction, and the unit case 30 may have an inner circumferential surface along the multiple outer circumferential surfaces. The protrusion 36 is provided on the inner circumferential surface at a portion that may collide with the outer circumferential surface of the unit 60 when in an irregular state.

[0050] With this configuration, the protrusion 36 is provided at a portion of the inner surface that may collide with the outer peripheral surface of the unit 60 when in an irregular state, thereby more reliably suppressing rattling of the unit 60 relative to the unit case 30.

[0051] (1e) In one embodiment of the present disclosure, the amount of protrusion H2 from the inner surface of the protrusion 36 is set to be smaller than the amount of protrusion H1 from the outer circumferential surface of the convex portions 62A to 62C. With this configuration, the protrusion amount H2 of the protrusion 36 is smaller than the protrusion amount H1 of the convex portions 62A to 62C, so that it is possible to prevent the protrusion 36 from adversely affecting the workability when inserting the unit 60 into the unit case 30.

[0052] (1f) In one embodiment of the present disclosure, the protrusion 36 may be configured so that the amount of protrusion from the inner surface decreases toward the opening 31 side. With this configuration, the amount of protrusion 36 protruding from the inner surface decreases as it moves toward the opening 31, making it less likely that the end of unit 60 will get caught on protrusion 36 when unit 60 is inserted into unit case 30.

[0053] (1g) In one aspect of the present disclosure, when unit 60 is attached to unit case 30 and convex portions 62A-62C and slits 32A, 32B are viewed from a direction perpendicular to opposing surfaces 61A, 61B, convex portions 62A-62C and inclined surface 33 are positioned so that they do not overlap at least in part.

[0054] According to such a configuration, it is possible to make it difficult for the convex portions 62A to 62C to get caught in the inclined surface 33 when the unit 60 is mounted inside the unit case 30 (that is, in the normal state).

[0055] 2. Other embodiments Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and can be implemented in various modified forms.

[0056] (2a) In the above embodiment, the slit 32A of the unit case 30 has the inclined surface 33, but this is not limited thereto. The inclined surface 33 may be provided on at least one of the pair of slits 32A, 32B and the protruding portions 62A to 62C. Note that "at least one of the pair of slits and the protruding portion" means "at least one of the first slit, the second slit, and the protruding portion." In other words, the inclined surface 33 may be provided on at least one of the first slit, the second slit, and the protruding portions 62A to 62C.

[0057] For example, instead of or in addition to the inclined surface 33, an inclined surface 62D may be provided by cutting out a part of the protruding portion 62C of the unit 60 as shown in Fig. 10A. Alternatively, an inclined surface 62E may be provided by cutting out a part of the protruding portion 62A as shown in Fig. 10B.

[0058] (2b) In the above embodiment, the main body case 2 and the unit case 30 are configured separately, but this is not limited to the above. For example, a part of the main body case 2 may function as the entire unit case 30, or a part of the main body case 2 may function as a part of the unit case 30. In other words, the main body case 2 and the unit case 30 may be configured as a single unit.

[0059] (2c) The evaporated fuel treatment device 1 may have one or more mounting structures 5. Also, one mounting structure 5 may have one or more snap-fit ​​structures (i.e., a pair of slits 32A, 32B and a combination of the first engagement portion 34A and the second engagement portion 64A).

[0060] (2d) Multiple functions possessed by one component in the above embodiments may be realized by multiple components, or one function possessed by one component may be realized by multiple components. Also, multiple functions possessed by multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Also, a part of the configuration of the above embodiment may be omitted. Also, at least a part of the configuration of the above embodiment may be added to or substituted for the configuration of another of the above embodiments. Note that all aspects included in the technical idea identified from the wording described in this disclosure are embodiments of the present disclosure.

[0061] (2e) In addition to the mounting structure 5 described above, the present disclosure can also be realized in various forms, such as an evaporative fuel treatment device 1 that has the mounting structure 5 as a component, a system that includes the mounting structure 5, and a method of mounting the unit 60 to the unit case 30.

[0062] [Technical idea disclosed in this specification] [Item 1] A mounting structure for a unit to be mounted on an evaporated fuel treatment device, The device includes a case and a unit that is mounted in the case, The case portion is An opening portion configured to open at an end surface opposite to the bottom portion; A pair of slits extending from the end surface toward the bottom side; A first engagement portion disposed between the pair of slits; Equipped with The unit comprises: The outer circumferential surface of the unit facing the pair of slits is defined as an opposing surface, A protrusion configured to protrude from the opposing surface; A second engagement portion configured to be able to engage with the first engagement portion at the opposing surface; Equipped with An axis along the insertion direction of the unit into the case portion is defined as a rotation axis, and a direction around the rotation axis is defined as a circumferential direction, At least one of the pair of slits and the protrusion is an inclined surface that is configured to extend along the circumferential direction; A mounting structure for a unit comprising: [Item 2] A mounting structure for the unit according to item 1, When the unit is mounted in the case portion, a state in which the inner surface of the case portion in which the slit is provided is parallel to the opposing surface is defined as a normal state, and a state in which the unit rotates in the circumferential direction from the normal state and the convex portion is fitted into the slit is defined as an engaged state, The inclined surface is provided in a region of the slit through which the protrusion passes when transitioning from the fitted state to the normal state. Unit mounting structure. [Item 3] A mounting structure for a unit according to item 1 or 2, The case portion is a protrusion extending from the bottom side toward the opening side and protruding from an inner surface of the case portion. Unit mounting structure. [Item 4] Item 3 is a mounting structure for a unit according to the present invention, The amount of protrusion of the protruding portion from the inner surface is set to be smaller than the amount of protrusion of the convex portion from the outer circumferential surface. Unit mounting structure. [Item 5] A mounting structure for a unit according to item 3 or 4, The protruding portion protrudes from the inner surface by a smaller amount toward the opening side. The mounting structure of the unit is configured as follows. [Item 6] A mounting structure for a unit according to any one of items 1 to 5, When the unit is mounted in the case, the protrusion and the inclined surface are disposed so as not to overlap at least partially when the protrusion and the slit are viewed from a direction perpendicular to the opposing surface. Unit mounting structure. [Explanation of symbols]

[0063] 1...evaporative fuel treatment device, 2...main body case, 5...mounting structure, 21...charge port, 22...purge port, 23...atmospheric port, 30...unit case, 30A...inner surface, 31...opening, 32A, 32B...pair of slits, 33...inclined surface, 34A...first engagement portion, 36...protrusion, 36A...first outer wall, 36B...second outer wall, 37...tapered surface, 41...bottom, 42...hole, 50...joint, 60...unit, 60A...outer surface, 61A, 61B...opposing surfaces, 62A-62C...convex portions, 62D, 62E...inclined surfaces, 64A...second engagement portion, O...central region, P...rotational axis, R...rotational direction.

Claims

1. A mounting structure for a unit to be mounted on an evaporated fuel treatment device, The device includes a case and a unit that is mounted in the case, The case portion is An opening portion configured to open at an end surface opposite to the bottom portion; A pair of slits extending from the end surface toward the bottom side; A first engagement portion disposed between the pair of slits; Equipped with The unit comprises: The outer circumferential surface of the unit facing the pair of slits is defined as an opposing surface, A protrusion configured to protrude from the opposing surface; A second engagement portion configured to be able to engage with the first engagement portion at the opposing surface; Equipped with An axis along the insertion direction of the unit into the case portion is defined as a rotation axis, and a direction around the rotation axis is defined as a circumferential direction, At least one of the pair of slits and the protrusion is an inclined surface that is configured to extend along the circumferential direction; A mounting structure for a unit comprising:

2. The unit mounting structure according to claim 1, When the unit is mounted in the case portion, a state in which the inner surface of the case portion in which the slit is provided is parallel to the opposing surface is defined as a normal state, and a state in which the unit rotates in the circumferential direction from the normal state and the convex portion is fitted into the slit is defined as an engaged state, The inclined surface is provided in a region of the slit through which the protrusion passes when transitioning from the fitted state to the normal state. Unit mounting structure.

3. The unit mounting structure according to claim 1, The case portion is a protrusion extending from the bottom side toward the opening side and protruding from an inner surface of the case portion. Unit mounting structure.

4. The unit mounting structure according to claim 3, The amount of protrusion from the inner surface of the protruding portion is set to be smaller than the amount of protrusion from the outer circumferential surface of the convex portion. Unit mounting structure.

5. The unit mounting structure according to claim 3 or 4, The protruding portion protrudes from the inner surface by a smaller amount toward the opening side. The mounting structure of the unit is configured as follows.

6. The unit mounting structure according to any one of claims 1 to 4, The inclined surface is provided in at least one of the pair of slits, When the unit is mounted in the case, the protrusion and the inclined surfaces provided in the pair of slits are arranged so as not to overlap at least partially when the protrusion and the slit are viewed from a direction perpendicular to the opposing surface. Unit mounting structure.

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