Smc Kabushiki Kaisha

Smc Corporation

Shigekazu Nagai

Akio Saitoh

Koji Sugano

Shuuzou Sakurai

Masaki Miyahara

Tadasu Kawamoto

Toru Sugiyama

Yoshiharu Ito

Masaru Saitoh

Ryuichi Masui

Hiroyuki Shiomi

Masahiko Suzuki

Masayoshi Yamamoto

Hiroshi Matsushima

Takeshi Hirose

Hiroshi Yumiba

Masahiko Someya

Masayuki Nakamura

Masahisa Hasegawa

Shigeru Sugano

Takeshi Nagai

Masaki Imamura

Takashi Takebayashi

Kazuyuki Oguma

Mitsuhiro Saito

Takashi Toyama

Ryuuichi Masui

Junko Ichinohe

Yousuke Shirai

Masamichi Tajima

Fumio Morikawa

Takeshi Sakasegawa

Yosuke Shirai

Junichi Saito

Teruo Inaba

Motoshi Togasaki

Shunichi Notoyama

Ryoichi Suzuki

Kotaro Nagai

Yoshiyuki Yamasaki

Yasuhisa Ueki

An automatic speed reducing ratio-switching apparatus comprising an input side carrier, an output side carrier, and an intermediate carrier includes first and second planetary gear mechanisms juxtaposed in the axial direction of an input shaft, first and second inner clutch members which are rotatable in one direction while locking rotation in the other direction of the input shaft, and have mutually different locking directions, first and second outer clutch members which are rotatable in one direction while locking rotation in the other direction of the input side or output side ring gear, and have mutually different locking directions, and a viscous resistance member functioning under a static frictional force to integrally rotate the input side or output side sun gear, the input side or output side planet gears, and the input side or output side ring gears respectively in an identical direction.

Automatic speed reducing ratio-switching apparatus

Disclosed is an electric actuator capable of effectively absorbing shock exerted on its component part. The electric actuator has a housing, a rod cover, a piston, a feed screw, a sliding nut, two piston dampers for absorbing shock exerted on the piston, a first end damper attached to one of the opposite ends of the housing, a second end damper attached to the rod cover. The sliding nut is axially displaceable relative to the piston when the piston damper absorbs shock.

Electric actuator capable of converting rotational motion to a linear motion

A guide mechanism, which guides a slider along an inner wall surface of a frame, includes a plurality of resin sliding members retained by the slider. The plurality of resin sliding members include a pair of first resin sliding members that make sliding movement along first sliding grooves formed in a bottom wall section of the frame, a pair of second resin sliding members that make sliding movement along second sliding grooves formed in side wall sections of the frame, and a pair of third resin sliding members that make sliding movement along third sliding grooves formed in the side wall sections.

Actuator

Helical gears, which are provided for a sun gear, planet gears, and an internal gear, have helix angles &#x3b8; of not less than 25 degrees and not more than 45 degrees. Pawls provided for lock sections and internal gear lock receiving sections of the internal gear have rising angles &#x3b3;, respectively, that satisfy the relational expression, 0 &#x2266;tan &#x3b3;&#x3c;(&#x3b7;&#xb7;di)/{dp&#xb7;tan(90&#x2212;&#x3b1;)}, wherein &#x3b1; is the helix angle of the sun gear, &#x3b7; is the screw efficiency of the sun gear as a sliding screw, dp is the pitch circle diameter of the sun gear, and di is an outer diameter of the internal gear defining a center of application of torque of the pawls.

Pressed shape steel, made of a low cost general steel material that is not hardened, forms a frame with long grooves cut therein. Guide rails, made of a specialized steel material that can be subjected to a hardening treatment, are hardened. Thereafter, outer surfaces of the hardened guide rails are ground and the guide rails are integrally joined in the long grooves. Ball-rolling grooves are formed in the guide rails, thereby completing a guide-equipped frame for an actuator. Because the general steel material and the specialized steel material are principally ferrous materials, both exhibiting a Young's modulus at or above 170 GPa with substantially the same coefficient of linear thermal expansion, the frame needn't be increased in size or have a complex internal structure to reinforce the strength of the frame, and the guide rails remain securely retained in the grooves even if the actuator experiences changes in temperature.

Method for producing actuator having guide-equipped frame

An actuator control system comprises an electric actuator, a driver, and a controller. The electric actuator is provided with a buffering mechanism which absorbs impact applied to a piston rod. The buffering mechanism includes piston dampers which absorb impact applied to a piston, a first end damper which is provided at an end of a housing facing the piston, and a second end damper which is provided on a rod cover separated from the housing by a predetermined distance.

Actuator control system

A driver comprises a direction-switching means which switches a rotation direction of a rotary driving source based on a direction instruction signal, a current amplifier/limiter which converts a voltage outputted from the direction-switching means into a corresponding current and which limits the current to a preset reference current I(threshold value), a current sensor which detects the current supplied to the rotary driving source, and a current loop which feeds back a detection signal supplied from the current sensor to an upstream side of the current amplifier/limiter.

Control system for electric actuator

A ball screw mechanism includes a ball screw shaft of a metal material coaxially connected to a rotary driving source, a nut member of a resin material being screwed onto the ball screw shaft, a plate member fixed to an upper surface of the nut member by screw members, and steel balls which are arranged on a passage formed in the nut member closed by the plate member and which are installed into screw grooves of the ball screw shaft and the nut member.

Ball screw mechanism

Helical gears are used for a sun gear, planet gears, and an internal gear. Accordingly, when a load, which exceeds a preset torque, is applied to the internal gear, the internal gear is moved in a direction toward an input shaft or a direction toward an output shaft while making rotation in a direction different from that of the sun gear to automatically switch the speed reducing ratio.

Electric cylinder with guide

A rotary driving source is connected to one end of a frame. The rotary driving force of the rotary driving source is transmitted to a slider by the aid of a driving pulley, a belt member, and a driven pulley. The slider is displaced in the axial direction of the frame while being guided by a guide mechanism. Each of the frame and the slider is formed of, for example, an aluminum alloy. First guide rails are installed in the frame and second guide rails are installed in side surfaces of the slider. The first guide rails and the second guide rails are formed of a metal material subjected to a hardening treatment.

An electric actuator comprises a gear mechanism which transmits the rotary driving force of a rotary driving source, and a ball spline mechanism which includes a ball spline shaft provided movably back and forth from a connecting block to the outside and which converts a rotary motion transmitted by the gear mechanism into a rectilinear motion. The electric actuator has a ball spline nut which is externally fitted to the ball spline shaft to be meshed with the gear mechanism and which is integrally formed with a gear section having a plurality of teeth arranged circumferentially about the gear section.

Electric actuator

Vacuum generator

Growing community of inventors

Adachi-ku, Japan

Shigekazu Nagai