KR-102962908-B1 - Method for manufacturing an actuator and its actuator case and a core for manufacturing

KR102962908B1KR 102962908 B1KR102962908 B1KR 102962908B1KR-102962908-B1

Abstract

In an actuator case, an attachment groove for mounting a boot attachment part is formed on the inner circumference of an output hole to protect the attachment part from external impact, and the attachment groove can be formed simultaneously during the molding of the actuator case with resin. At the outer end of the output hole, a plurality of first protruding walls are formed that protrude radially inward and are arranged with a first gap between them in the circumference of the output hole, and at the inner end of the output hole, a plurality of second protruding walls are formed that protrude radially inward and are arranged with a second gap between them in the circumference of the output hole, and the first and second protruding walls are arranged so as not to overlap each other when viewed in the planar view of the output hole, and the attachment groove for mounting a boot attachment part is partitioned on the inner circumference of the output hole by the first and second protruding walls.

Inventors

무샤 마스미

Assignees

아스테모 가부시키가이샤

Dates

Publication Date: 20260508
Application Date: 20230607
Priority Date: 20220719

Claims (7)

As an actuator, the actuator is, The apparatus comprises a resin actuator case and an actuator mechanism housed in the actuator case, and The output member of the above actuator mechanism is positioned to penetrate the output hole of the actuator case, and A boot covering the outer portion of the output member protruding out of the output hole is attached to the actuator case, and A plurality of first protruding walls are formed on the outer end side of the output hole, protruding radially inward from the inner surface of the output hole, and arranged with a first gap between them in the circumferential direction of the output hole. In addition, a plurality of second protruding walls are formed on the inner end side of the output hole, protruding radially inward from the inner circumference of the output hole and arranged with a second gap between them in the circumferential direction of the output hole. The first and second protruding walls are arranged so as not to overlap each other in the planar view of the output hole, and An actuator characterized in that, by the first and second protruding walls, an attachment groove for mounting the attachment portion of the boot is partitioned on the inner surface of the output hole.
In paragraph 1, An actuator characterized in that the width of the first gap between the first protruding walls is set to be greater than the length along the circumferential direction of the output hole of the second protruding wall.
In paragraph 1, An actuator characterized in that the protrusion height of the second protrusion wall is set to be greater than the protrusion height of the first protrusion wall, and the second protrusion wall supports the attachment part during the mounting process to the attachment groove of the attachment part.
In paragraph 1, An actuator characterized in that the length of the first protruding wall along the circumferential direction of the output hole is set to be smaller than the length of the second protruding wall along the circumferential direction of the output hole.
In any one of paragraphs 1 through 4, An actuator characterized by having a reinforcing member embedded in the above-mentioned attachment portion.
As a method for manufacturing an actuator case, The above actuator case is, An output hole positioned to pass through the output member, and The above output member has an attachment groove for mounting an attachment portion of a boot that covers an outer portion protruding out of the output hole, and The attachment groove is partitioned on the inner surface of the output hole by means of a plurality of first protruding walls protruding radially inward from the outer end of the output hole and arranged with a first gap between them in the circumferential direction of the output hole, and a plurality of second protruding walls protruding radially inward from the inner end of the output hole and arranged with a second gap between them in the circumferential direction of the output hole. The first and second protruding walls are arranged so as not to overlap each other in the planar view of the output hole, and In the process of molding the above actuator case with resin, A core forming the inner surface of the output hole is provided, and the core is configured by axially separably fitting a first core half located at the outer end of the output hole and a second core half located at the inner end of the output hole. Between the first and second intermediate bodies, first and second concave portions forming the first and second protruding walls, respectively, are partitioned, and A method for manufacturing an actuator case, characterized in that resin is injected into a cavity comprising the first and second concave portions, which are partitioned by the first and second core bodies and an outer frame forming the outer surface of the actuator case.
As a core used in the method of manufacturing an actuator case according to paragraph 6, The first core body is composed of a hollow cylindrical part forming the inner surface of the attachment groove and a ceiling wall part connected to the outer end of the hollow cylindrical part, and A groove corresponding to the first protruding wall is formed in the ceiling wall portion above, and In the above hollow cylindrical portion, a cut corresponding to the second gap between the second protruding walls is formed, and The above-mentioned second core body is composed of a first cylindrical part that is fitted so as to be inserted into and removed from the inner circumference of the hollow cylindrical part, and a second cylindrical part having a larger diameter than that connected to the first cylindrical part. On the first cylindrical portion, a projection is formed that combines with the cutout and cooperates with the groove portion to partition the first concave portion. A core used in a method for manufacturing an actuator case, characterized in that the second concave portion is partitioned by the front end surface of the hollow cylindrical portion, the projection, and the stepped portion between the first and second cylindrical portions.

Description

Method for manufacturing an actuator and its actuator case and a core for manufacturing The present invention relates to an actuator comprising an actuator mechanism housed in a resin actuator case, wherein an output member of the actuator mechanism is positioned to penetrate an output hole of the actuator case, and a boot covering an outer portion of the output member protruding outside the output hole is attached to the actuator case, and to a method for manufacturing the actuator case and a core used in the method for manufacturing the actuator case. Such actuators are already known as disclosed in Patent Document 1. FIG. 1 is a longitudinal side view of an actuator according to an embodiment of the present invention. FIG. 2 is an enlarged view of part 2 of FIG. 1 (however, the output bolt is not shown). FIG. 3 is a cross-sectional view along line 3-3 of FIG. 2. FIG. 4 is a cross-sectional view of a product and a mold showing a molding method around the output hole of an actuator case. FIG. 5 is a cross-sectional view showing the product and core in FIG. 4 in a disassembled state. FIG. 6 is a cross-sectional view with different cross-sectional locations corresponding to FIG. 4. FIG. 7 is a cross-sectional view showing the product and core in FIG. 6 in a disassembled state. FIG. 8 is a perspective view showing the above-mentioned product and core in a disassembled state. An embodiment of the present invention will be described with reference to the attached FIG. 1. The actuator (A) includes an actuator case (10) and an actuator mechanism (11) housed therein. In this actuator (A), the extension direction of the rear output bolt (19) from the actuator case (10) is directed forward, and the opposite direction is directed backward. The actuator case (10) has a cylindrical motor case part (10a), a cylindrical output case part (10b) arranged adjacently parallel to the motor case part (10a), and a gear case part (10c) connecting the rear end of the motor case part (10a) to the middle part of the output case part, and an output hole (15) is formed at the front end of the output case part (10b). Additionally, this actuator case (10) is divided into a case body (10A) in the front part and a case cover (10B) in the rear part to enable assembly and disassembly of the actuator mechanism (11). These case body (10A) and case cover (10B) are injection molded with resin. The actuator mechanism (11) comprises a motor (12) housed in a motor case portion (10a), an output bolt (19) positioned to protrude outward from an output case portion (10b) through an output hole (15), a reduction gear train (13) housed from a gear case portion (10c) to an output case portion (10b) and which reduces the rotation of the rotor shaft (10a) of the motor (12) and transmits it to a final gear (14), and a motion conversion mechanism (16) housed in an output case portion (10b) and which converts the rotational motion of the final gear (14) into axial motion and transmits it to the output bolt (19). The motion conversion mechanism (16) is provided with a rotating nut (18) that is supported in the output case (10b) via a bearing (17) so as to be rotatable and immovable in the axial direction, and a male thread (19a) of the output bolt (19) that is screw-coupled to the female thread (18a) of the rotating nut (18). The rotating nut (18) has a large-diameter cylindrical part (20) integrally connected to its rear end and coupled to the final gear (14), so that it can rotate together with the final gear (14) but cannot move in the axial direction. Additionally, a key (21) protruding in the diameter direction is formed at the rear end of the output bolt (19), and a keyway (22) into which the key (21) is slidably coupled is installed in the output case (10b). Therefore, the output bolt (19) can move in the axial direction but cannot rotate. The tip of this output bolt (19) protruding out of the output hole (15) is connected to a parking brake mechanism (not shown) of a drum brake via a cable (23). A plurality of disc springs (24) that are compressed by the advancement of the key (21) are accommodated within the large diameter cylindrical portion (20) of the rotating nut (18). Then, by the operation of the motor (12), the rotational power of the rotor shaft (10a) is reduced and transmitted to the final gear (14) through the gear train (13), and when the rotating nut (18) rotates together with the final gear (14), the rotating nut (18) imparts a thrust force to the output bolt (19) through the male screw (19a) that rotates in the opposite direction of rotation. When the output bolt (19) is shifted backward by the thrust force, the cable (23) is pulled to put the parking brake mechanism (not shown) into a brake state, and when the output bolt (19) is shifted forward, the cable (23) is loosened to put the parking brake mechanism into a brake release state. In this brake release state, the disc spring (24) is compressed between the rotating nut (18) and the k