Provided is an electric actuator, including: a driving motor (2); a motion conversion mechanism (6) configured to convert a rotary motion of the driving motor (2) to a linear motion; a boot (27) configured to prevent entry of a foreign substance into the motion conversion mechanism (6); and a boot cover (31) arranged so as to cover an outer side of the boot (27), wherein the boot cover (31) is formed integrally with an exterior case (8) of the electric actuator, and wherein a boot mounting member (30) having the boot (27) mounted thereto is mounted to an inner side of the boot cover (31).

A dust cover in which an improvement in sealing performance is achieved. A dust cover 100 used in a ball joint includes a seal main body made of an elastic body and integrally having a body portion 110, a fixed portion 130 that is provided on one end side of the body portion 110, and a seal portion 120 that is provided on the other end side of the body portion 110, and an annular auxiliary seal 150 made of resin and provided in the seal portion 120. The seal portion 120 includes an inner peripheral seal portion and a dust lip 122, and the auxiliary seal 150 includes an auxiliary inner peripheral seal portion 151, an auxiliary dust seal portion, and a supported portion 153 that is supported by a collar fixed to a shaft portion on an opposite side to the auxiliary dust seal portion in an axial direction.

A dust cover in which an improvement in sealing performance is achieved. A dust cover 100 used in a ball joint includes a seal main body made of an elastic body and integrally having a body portion 110, a fixed portion 130 that is provided on one end side of the body portion 110, and a seal portion 120 that is provided on the other end side of the body portion 110, and an annular auxiliary seal 150 made of resin and provided in the seal portion 120. The seal portion 120 includes an inner peripheral seal portion and a dust lip 122, and the auxiliary seal 150 includes an auxiliary inner peripheral seal portion 151, an auxiliary dust seal portion, and a supported portion 153 that is supported by a collar fixed to a shaft portion on an opposite side to the auxiliary dust seal portion in an axial direction.

A dust seal for sealing a gap between an opening and a shaft inserted through the opening includes a dust seal body in an annular shape and a bushing in an annular shape. The shaft is slidably inserted through the bushing. The dust seal body includes an attaching portion, a first accordion unit, and a second accordion unit. The first accordion unit and the second accordion unit are arranged side by side in a direction of an axis. The first accordion unit is integral with the attaching portion, is joined to the attaching portion at an outer periphery, and is fixed to the bushing at an inner periphery. The second accordion unit is fixed to the attaching portion at the outer periphery, and locked to the bushing at the inner periphery.

An electromotive unit includes a linear motor, a motor case containing the linear motor, a movable element connected with the linear motor and reciprocatingly driven with respect to the motor case, and a sealing material sealing the gap between the movable element and the opening of the motor case. The sealing material includes a contact portion contacting the movable element; and a recessed portion formed around contact portion, having a ring-shaped groove facing the outside of the motor case, and elastically deformable according to reciprocating movement of the movable element. This aspect provides an electromotive unit that hardly generates noise while the movable element is being reciprocatingly driven; and a small-size electrical appliance including the electromotive unit.

An electromotive unit includes a linear motor, a motor case containing the linear motor, a movable element connected with the linear motor and reciprocatingly driven with respect to the motor case, and a sealing material sealing the gap between the movable element and the opening of the motor case. The sealing material includes a contact portion contacting the movable element; and a recessed portion formed around contact portion, having a ring-shaped groove facing the outside of the motor case, and elastically deformable according to reciprocating movement of the movable element. This aspect provides an electromotive unit that hardly generates noise while the movable element is being reciprocatingly driven; and a small-size electrical appliance including the electromotive unit.

A dust seal includes an annular dust seal body, an annular bushing through which a shaft is slidably inserted, and an annular seal lip provided on the bushing and slidably contacting the shaft. The dust seal body includes an annular elastic attaching portion that is fitted into an opening of a receiving portion, an annular first accordion unit having an elastic accordion, and an annular second accordion unit having an elastic accordion. The first accordion unit and the second accordion unit are arranged side by side in the direction of an axis. The first accordion unit is integral with the attaching portion, is joined to the attaching portion at an outer periphery, and is bonded to the bushing at an inner periphery by vulcanization. The second accordion unit is fixed to the attaching portion at an outer periphery, and engaged with the bushing at an inner periphery.

A dust seal includes an annular dust seal body, an annular bushing through which a shaft is slidably inserted, and an annular seal lip provided on the bushing and slidably contacting the shaft. The dust seal body includes an annular elastic attaching portion that is fitted into an opening of a receiving portion, an annular first accordion unit having an elastic accordion, and an annular second accordion unit having an elastic accordion. The first accordion unit and the second accordion unit are arranged side by side in the direction of an axis. The first accordion unit is integral with the attaching portion, is joined to the attaching portion at an outer periphery, and is bonded to the bushing at an inner periphery by vulcanization. The second accordion unit is fixed to the attaching portion at an outer periphery, and engaged with the bushing at an inner periphery.

A sealing system includes a shaft seal plate, a seal guide having a tab, and a shaft seal coupled to the seal guide. A guide slot is formed in the shaft seal plate, and the tab extends into the guide slot. The shaft seal is configured to form and substantially maintain a seal at an axle bar as the axle bar rotates and pivots. The seal guide is configured to translate relative to the shaft seal plate as the axle bar pivots, and the tab is configured to block a rotation of the seal guide and the shaft seal relative to the shaft seal plate as the axle bar rotates.

A sealing system includes a shaft seal plate, a seal guide having a tab, and a shaft seal coupled to the seal guide. A guide slot is formed in the shaft seal plate, and the tab extends into the guide slot. The shaft seal is configured to form and substantially maintain a seal at an axle bar as the axle bar rotates and pivots. The seal guide is configured to translate relative to the shaft seal plate as the axle bar pivots, and the tab is configured to block a rotation of the seal guide and the shaft seal relative to the shaft seal plate as the axle bar rotates.