# US 12,180,915 B2 · Unit attachment structure

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- Number: US 12,180,915 B2
- Document ID: US12180915B2
- Status: Granted
- Kind: B2
- Application number: 18/502,748
- Filed: 2023-11-06
- Published: 2024-07-04
- Granted: 2024-12-31
- Earliest claimed: 2022-12-28
- Assignees: Futaba Industrial Co., Ltd.
- Applicants: Futaba Industrial Co., Ltd.
- Inventors: Tamami Ina
- Web page: https://patentgrep.com/patent/US12180915B2

## CPC

- F02M 25/0854: {Details of the absorption canister}
- F02M 25/08: adding fuel vapours drawn from engine fuel reservoir {(electrical control of purge system F02D41/003)}
- F02M 37/0017: {related to fuel pipes or their connections, e.g. joints or sealings (F02M55/004 takes precedence)}
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

Provided is a unit attachment structure. The unit attachment structure includes a case and a unit to be inserted into the case. The case includes an opening, paired slits, and a first engagement portion. The unit includes a projection projecting from a facing surface of the unit, and a second engagement portion. At least one of one slit of the paired slits or the projection includes a slanting surface formed along a circumferential direction.

## Claims

### Claim 1

A unit attachment structure configured to be attached to an evaporated fuel treatment device, the unit attachment structure comprising:
a case; and
a unit to be inserted into the case,
the case including:
an opening opened at an end face of the case opposite to a bottom of the case;
paired slits extending from the end face toward the bottom; and
a first engagement portion arranged between the paired slits,
the unit including a projection and a second engagement portion,
the projection projecting from a facing surface of the unit, the facing surface being an outer peripheral surface of the unit configured to face the paired slits, the projection having a structure different from the second engagement portion, the projection being arranged so as to be able to contact a wall provided in a manner that surrounds the bottom of the case,
the second engagement portion being arranged on the facing surface and configured to be engageable with the first engagement portion on the facing surface, and
at least one slit of the paired slits including a slanting surface formed along a circumferential direction, the circumferential direction being a direction about a rotation axis along an insertion direction of the unit into the case.

### Claim 2 (depends on 1)

The unit attachment structure according to claim 1,
wherein there is defined a proper state where an inner surface of the case provided with the paired slits and the facing surface are parallel to each other when the unit is inserted into the case, and there is defined a fit-in state where the projection of the unit is fitted into at least one of the paired slits upon the unit being rotated in the circumferential direction from the proper state, and
wherein the slanting surface is provided to an area of the at least one of the paired slits where, when the projection in the fit-in state is shifted to the proper state, the projection passes.

### Claim 3 (depends on 1)

The unit attachment structure according to claim 1,
wherein the case further includes a protruding part extending from the bottom of the case toward the opening of the case, the protruding part protruding from the inner surface of the case.

### Claim 4 (depends on 3)

The unit attachment structure according to claim 3,
wherein the protruding part of the case has a protruding length from the inner surface of the case, the protruding length of the protruding part being set to be shorter than a projecting length of the projection from the outer peripheral surface of the unit.

### Claim 5 (depends on 3)

The unit attachment structure according to claim 3,
wherein the protruding part of the case is formed such that the protruding length thereof from the inner surface of the case is shortened toward the opening of the case.

### Claim 6 (depends on 1)

The unit attachment structure according to claim 1,
wherein, in a state where the unit is inserted into the case, the projection of the unit and the slanting surface are arranged so as not to at least partially overlap with each other when the projection and the paired slits are viewed in a direction orthogonal to the facing surface.

### Claim 7 (depends on 1)

The unit attachment structure according to claim 1,
wherein the unit includes four outer peripheral surfaces parallel to the insertion direction, and
wherein the projection is arranged on at least one of the four outer peripheral surfaces.

### Claim 8 (depends on 1)

The unit attachment structure according to claim 1, wherein the slanting surface, which is a flat surface, is provided to the at least one slit of the paired slits.