US-12626876-B2 - Electromagnetic relay having a case ANS a yoke fixed outside a wall of the case

US12626876B2US 12626876 B2US12626876 B2US 12626876B2US-12626876-B2

Abstract

An electromagnetic relay includes a case, a contact device, and an electromagnet device. The contact device includes a fixed contact and a movable contact piece including a movable contact. The electromagnet device is configured to drive the contact device. The electromagnet device is housed in the case. The electromagnet device includes a yoke. The yoke includes an extending portion extending to outside the case. The yoke is secured to the case via the extending portion.

Inventors

Shinichi Ogawa
Ryota Minowa

Assignees

OMRON CORPORATION

Dates

Publication Date: 20260512
Application Date: 20230706
Priority Date: 20220722

Claims (6)

1 . An electromagnetic relay, comprising: a case having a top wall, a bottom wall, and side walls disposed between and connected to the top and bottom walls, the bottom wall extending beyond the side walls; a contact case housed in the case; a contact device housed in the contact case, the contact device including a fixed contact and a movable contact piece including a movable contact; and an electromagnet device including a yoke, the yoke being disposed at the bottom of the electromagnet device and above the bottom wall, the electromagnet device housed in the case, the electromagnet device configured to drive the contact device, wherein the yoke includes an extending portion extending to outside of the case and is secured to the case at the extending portion.
2 . The electromagnetic relay according to claim 1 , wherein the extending portion is attached to the case via screws.
3 . The electromagnetic relay according to claim 1 , wherein the case includes a mounting portion disposed outside the side walls, the mounting portion has a first screw-receiving hole passing the mounting portion in a first direction, and the extending portion has a second screw-receiving hole overlapping the first screw-receiving hole when viewed from the first direction, the extending portion being secured to the mounting portion.
4 . The electromagnetic relay according to claim 3 , wherein the extending portion is configured to be screwed to another member together with the mounting portion.
5 . The electromagnetic relay according to claim 1 , wherein the case is comprised of an insulating material.
6 . The electromagnetic relay according to claim 1 , wherein the bottom wall has a mounting portion disposed outside the side walls, and the yoke is secured to the case at the mounting portion.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to Japanese Patent Application No. 2022-117464, filed Jul. 22, 2022. The contents of that application are incorporated by reference herein in their entirety. FIELD The claimed invention relates to electromagnetic relays. BACKGROUND Conventionally, an electromagnetic relay including a case and an electromagnet device housed in the case is known, such as the one disclosed in Japanese Patent Application Laid-Open No. 2013-222562. The electromagnet device includes a yoke. The yoke of the electromagnet device is secured to the case by urethane filling. SUMMARY Such security of the yoke to the case by urethane requires control of its manufacturing process, increasing the manufacturing cost. An object of the present invention is to reduce the manufacturing cost of an electromagnetic relay. An electromagnetic relay according to one aspect of the present invention includes a case, a contact device, and an electromagnet device. The contact device includes a fixed contact and a movable contact piece including a movable contact. The electromagnet device is configured to drive the contact device. The electromagnet device is housed in the case. The electromagnet device includes a yoke. The yoke includes an extending portion extending to outside of the case. The yoke is secured to the case at the extending portion. In this electromagnetic relay, the yoke is secured to the case at the extending portion of the yoke that extends to outside of the case. That is, since the yoke and the case can be secured together at outside of the case, for example, the yoke and the case can be screwed together at the extending portion. As a result, the manufacturing cost of the electromagnetic relay can be reduced as compared with the case where the yoke is secured to the case by urethane. The extension may be screwed to the case. In this case, the manufacturing cost of the electromagnetic relay can be reduced, and also the case and the yoke can be easily secured together with a screw member. The case may include a mounting portion exposed to outside of the case. The mounting portion may have a first screw-receiving hole passing therethrough in a first direction. The extending portion may have a second screw-receiving hole overlapping the first screw-receiving hole when viewed from the first direction. In this case, the manufacturing cost of the electromagnetic relay can be reduced, and also the case and the yoke can be easily secured together with a screw member. The extending portion may be screwable to an other member together with the mounting portion. In this case, the other member can be screwed to the yoke together with the case. The case may further include a recess recessed in a direction from the contact device toward the electromagnet device. The extending portion may be disposed in the recess. In this case, the case can be downsized. The movable contact may face the fixed contact in the first direction. The extending portion may extend to outside of the case from an intermediate position of the case in the first direction. In this case, the position where the yoke and the case are secured together is close to the center of gravity of the electromagnetic relay, enhancing durability against shock. The electromagnetic relay may further include a contact case that is housed in the case. The contact device may be housed in the contact case. In this case, the yoke and the case can be secured together at outside the case in the electromagnetic relay that has a contact case in the case. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view of an electromagnetic relay in accordance with the claimed invention. FIG. 2 is a schematic cross-sectional view of an electromagnetic relay in accordance with the claimed invention according to a modification. FIG. 3 is a schematic plan view of an electromagnetic relay in accordance with the claimed invention according to a modification. DETAILED DESCRIPTION An embodiment of an electromagnetic relay 100 according to one aspect of the claimed invention will be described below with reference to the drawings. When referring to the drawings, the upper side in FIG. 1 is referred to as “up”, the lower side as “down”, the left side as “left”, and the right side as “right” in order to facilitate understanding. Also, the direction orthogonal to the plane of FIG. 1 is defined as the front-rear direction. The up-down direction in the present embodiment is an example of a first direction Z. These directions are defined for convenience of description, and are not to limit the arrangement directions of the electromagnetic relay 100. FIG. 1 is a schematic cross-sectional view of the electromagnetic relay 100. As shown in FIG. 1, the electromagnetic relay 100 includes a case 2, a contact case 3, a contact device 4, and an electromagnet device 5. The case 2 has a substantially rectangular box shape and is comprised of an ins