Abstract: A bearing unit is provided which supports a shaft (51) rotatably. It includes the shaft (51), a radial bearing (55) to support the shaft (51) circumferentially, a thrust bearing (58) to support the shaft (51) at one of thrusting-directional ends of the latter, a housing (56) having disposed therein the radial bearing (55) and thrust bearing (58) supporting together the shaft (51) and which is filled with a viscous fluid (67), and a spacer member (65) disposed inside the housing (56) to keep a gap defined between the end face of the radial bearing (55) and one side of a radial projection (54) included in the shaft (51). On the end face of the radial breading (55) opposite to one side of the radial projection (54), there is formed a first dynamic pressure producing recess (63) which produces a dynamic pressure by the viscous fluid.

Abstract: A transmission includes a first shaft, a first rotational member coaxial with the first shaft for unitarily rotating with the first shaft, a first gear positioned to rotate relative to the first shaft, a first clutch mechanism for engaging and disengaging the first rotational member and the first gear, a second rotational member coaxially positioned with respect to the first shaft for unitarily rotating with the second rotational member, a second gear coaxially positioned with respect to the first shaft for rotating relative to the first shaft, a second clutch mechanism for engaging and disengaging the second rotational member and the second gear, and a gear member engaged with the first gear and the second gear. The first gear is positioned between the first rotational member and the second rotational member. The transmission is constructed so that the axial length of the gear member is shortened.

Abstract: A hydraulic pump with a built-in electric motor wherein an electric motor and a pump unit are arranged in tandem fashion and accommodated within a common housing. In this pump, the housing is in the form of a metal box having a rectangular parallelepiped external shape and forms an electric motor frame fixedly accommodating a stator of the electric motor therein. A space in the metal box on the electric motor side is separated as a dry space from an internal space of said pump unit by a seal mechanism. At least one hydraulic oil receiving chamber is formed in a peripheral wall of the metal box, and the hydraulic oil receiving chamber is communicated with a passage for receiving return oil externally and another passage communicating with a suction port of the pump unit.

Abstract: A transmission includes a first shaft, a first rotational member coaxial with the first shaft for unitarily rotating with the first shaft, a first gear positioned to rotate relative to the first shaft, a first clutch mechanism for engaging and disengaging the first rotational member and the first gear, a second rotational member coaxially positioned with respect to the first shaft for unitarily rotating with the second rotational member, a second gear coaxially positioned with respect to the first shaft for rotating relative to the first shaft, a second clutch mechanism for engaging and disengaging the second rotational member and the second gear, and a gear member engaged with the first gear and the second gear. The first gear is positioned between the first rotational member and the second rotational member. The transmission is constructed so that the axial length of the gear member is shortened.

Abstract: A differential gear device includes a pinion mechanism which transmits driving torque from the engine, and a differential case. The pinion mechanism includes a pinion shaft and a pinion gear, and a bearing is provided on one end of the pinion gear. A differential mechanism is disposed in the differential case and is provided with a ring gear. A differential carrier sets the pinion mechanism onto the differential case to connect the pinion gear with the ring gear. The inner race of the bearing is fixed to the pinion gear and is removable from or separable from the outer race of the bearing.

Abstract: A direct-teaching playback type polishing robot comprising a first arm and a second arm, a polishing tool suspended from a free end of said second arm, horizontal high-lead ball screws having nuts connected to said arms, respectively, and a servo-motor and an encoder mounted at a free end of threaded shaft of each of said ball screws in such a manner that rotation of said servo-motor advancing the corresponding nut to swing the corresponding arm independently of the other arm.

Abstract: A rechargeable organic electrolyte cell includes a cathode mainly composed of LiMn.sub.2 O4, obtained by sintering manganese dioxide with either lithium carbonate or lithium iodide.

Abstract: A variable displacement piston pump of the type in which the hydraulic pressure in a pressure chamber of an output flow variable element is controlled by a proportional electro-hydraulic control valve to control the displacement of the variable element against a spring to vary the output flow within a range between a maximum output flow and a full cut-off and the output pressure or both the output pressure and the output flow of the pump are controlled electro-hydraulically through a closed loop.

Abstract: An organic electrolyte cell is disclosed which comprises an anode made of Li or Li alloy, an organic electrolyte and cathode active material made of Li and metal complex oxide represented by LiMO.sub.2 wherein M stands for at least one of Co, Ni, Fe, Cr, and V. The cell has a discharge voltage of 1.2 to 1.3 volts which is compatible with mercury cell.

Abstract: A positioning control device wherein an abnormality in a position detector is judged only by use of two position signals having differing phases emitted from the position detector for effecting position detection of a movable article without using the data of movement of the movable article to be controlled. For this purpose, direction determining means are provided which are responsive to the position signals to provide normal or reverse direction signals. A logical circuit for effecting abnormality judging of the position detector is provided in a controller for emitting a position control signal corresponding to the position signal to a control circuit for effecting position control of the movable article. When an abnormal condition occurs in the position detector, the signal aspect of the position signal emitted from the position detector is varied from that during the normal operation.

Abstract: This invention relates to a method for preparing a hydrodesulfurization catalyst which comprises (a) preparing a filter cake of amorphous alumina hydrate at a pH of 7.5-10.5; (b) dewatering the above prepared filter cake by a filter press to raise the Al.sub.2 O.sub.3 concentration to 28-35% by weight and kneading the dewatered filter cake for at least 10 seconds by a self-cleaning type kneader; (c) kneading the dough obtained from the step (b) while adding respective aqueous solutions of water-soluble salts of Group VIB and Group VIII catalyst metals respectively in an amount of 20-60% by weight (as a metal amount) of the total metal amount used at the position just before the entrance of a kneader, kneading the resultant mixture and extruding the kneaded mixture by an extruder; (d) drying and calcining the extrudate; and (e) impregnating the calcined product with salts of remaining catalyst metals in an aqueous ammonia solution and drying and calcining the resultant product.

Abstract: Disclosed is a process of preparing an alumina carrier which comprises kneading an amorphous alumina hydrate, whose alumina concentration is in the range of 28-35 wt. % and which has been obtained by neutralizing an aluminum sulfate solution with a sodium aluminate solution at two stages, while endowing said hydrate with sufficient shearing effect and alternate compression and expansion effect; extruding a resulting dough; drying and calcining the extrudates. According to this process, it becomes possible to control the growth of pseudoboehmite grains contained in the alumina hydrate by controlling the time required for kneading, and accordingly it becomes possible to control the pore distribution of the finally obtained alumina carrier.

Abstract: Pulses indicating movement distance are frequency divided to a desired resolution and then counted in a microprocessor in accordance with the direction of movement. The position count value addresses a data memory storing switch output data corresponding to desired detection positions.

Abstract: A length measuring device has a magnetic scale body including at least one origin signal magnetic section and a measurement signal magnetic section forming a magnetic grating, the magnetic scale body having a uniform frictional surface formed over the entire effective length of the scale body, and a detecting head body including an origin detecting head for detecting an origin signal and a measurement detecting head for detecting a measurement signal and provided with a scraper in elastic contact with the frictional surface of the magnetic scale body, the detecting head body moving relative to the magnetic scale of the body along the length of the latter.

Abstract: The present invention relates to improvements in a method of sensing a position of a movable body by directly or indirectly converting a unit movement of the movable body into digital pulse signals and an apparatus therefor. A reference position is selected at a point, at which said movable body abuts against and presses a stopper provided at a specific position within the moving range thereof. The pulse signals are counted as the movable body moves from the stopper using the reference position as a reference number. The coincidence of the number of the pulse signals counted with a first predetermined pulse number corresponding to a predetermined position is sensed so as to sense the fact that the movable body has reached a predetermined position and position sensing signals are emitted.

Abstract: A method of manufacturing spherical alumina particles which comprises the steps of digesting, at an elevated temperature and an elevated pressure, gibbsite with an aqueous hydrochloric acid solution and then forming an aqueous basic aluminum chloride solution; adding, at an elevated temperature, an aqueous ammonia to said aqueous basic aluminum chloride solution to form an alumina hydrosol containing ammonium chloride; commingling said alumina hydrosol with a gelling agent; thereafter dispersing droplets of said mixture in a suspending medium under conditions effective to transform said droplets into hydrogel particles; ageing said hydrogel particles first in said suspending medium and then in aqueous ammonia; and then washing said hydrogel particles with water, drying and calcining to obtain spherical alumina particles.

Abstract: Two bevel gears are meshed together and rotated around their central axes in mesh, one of them transmitting power to the other. One of the gears is moved relative to the other, so that the meshing area between their teeth moves on the tooth surface of at least one of them. Occurrence of vibration is detected by a vibration detector. Thereby irregularities are tested for.

Abstract: A method of manufacturing spherical alumina comprising preparing a basic aluminum chloride solution having an aluminum concentration in the range of from 7 wt.% to 12 wt.% and a weight ratio of aluminum to chloride in the range of from 0.3 to 0.8 by reacting gibbsite with an aqueous hydrochloric acid solution at an elevated temperature, preparing an alumina hydrosol having an aluminum concentration in the range of from 9 wt.% to 15 wt.% and a weight ratio of aluminum to chloride in the range of from 0.8 to 1.5 by reacting the thus prepared solution with metallic aluminum at an elevated temperature, commingling this hydrosol with a gelling agent, dispersing the resulting mixture in the form of droplets in a suspending medium thereby to form hydrogel particles, ageing the thus obtained particles in said suspending medium and then an aqueous ammonia, washing with water, drying and calcining. The thus obtained spherical alumina is substantially free from sodium in spite of employing gibbsite as raw material.

Abstract: A catalyst carrier comprising gamma alumina wherein the apparent bulk density is in the range of from 0.65 g/cc to 0.71 g/cc, the total pore volume is in the range of from 0.55 cc/g to 0.65 cc/g, the content of pores having a diameter in the range of from 60A to 110A occupies at least 75% of the total pore volume, the surface area is in the range of from 210 m.sup.2 /g to 250 m.sup.2 /g and the attrition loss is less than 0.5 wt. %. This sort of catalyst carrier can be namufactured through a series of steps of: (a) preparing a first alumina hydrosol having an aluminum concentration in the range of from 9.8 wt. % to 14.4 wt. % and a weight ratio of aluminum to chloride in the range of from 0.95 to 1.20, (b) preparing a second alumina hydrosol having an aluminum concentration in the range of from 9.5 wt. % to 13.0 wt. % and a weight ratio of aluminum to chloride in the range of from 0.85 to 0.

Abstract: Substantially spherical alumina particles are obtained by a process comprising ageing substantially spherical alumina hydrogel particles obtained by the oil-drop method in an ammonium hydroxide solution wherein the concentration of ammonia changes continuously from an initial concentration in the range of from about 0.05 wt.% to about 0.5 wt.% to a final concentration in the range of from about 0.8 wt.% to about 2.5 wt.%. Alumina particles obtained by this process possess improved physical strength. Alumina particles which are obtained by calcining alumina particles aged in an ammonium hydroxide solution, wherein the concentration of ammonia increases continuously, at a temperature in the range of from 650.degree. to 800.degree. C in an atmosphere containing 30 mol.% or more of H.sub.2 O possesses a further improved thermal stability.