Abstract: A slave terminal includes: a data transmission unit that wirelessly transmits status data relating to a condition of a monitoring target to a monitoring apparatus in response to a transmission trigger at every fixed period; a reply check unit that determines whether or not an ACK signal was sent back from the monitoring apparatus in response to the status data that was transmitted; an adjustment value calculation unit that determines an adjustment period of a random length when there was no reply; a timing update unit that outputs a measurement start trigger after the adjustment period has elapsed when there was no reply, the timing update unit outputting the measurement start trigger without the adjustment period when there was a reply; and a trigger generation unit that outputs the transmission trigger after counting the fixed period in response to the measurement start trigger.

Abstract: A wireless terminal includes a pressure sensor, a wireless circuit, and a case accommodating the pressure sensor and the wireless circuit in a waterproof manner, and is left inside a stomach of a livestock animal to measure pressure inside the stomach and wirelessly transmit acquired pressure data. The case includes a cylindrical case body and a lid member closing an opening of the case body. The lid member has a measurement hole extending between inside and outside of the lid member and a protection wall part located outside of the case body. The measurement hole has a pressure-receiving pressure measurement part inside for measurement of the pressure and is closed. The measurement hole includes a first linear part and a second linear part intersecting in T shape with the first linear part, and has distal ends open to an outer face of the protection wall part.

Abstract: A power feeding device includes: a generator, the generator including a stator fixed to a wheel and a cylindrical rotor that rotates around a rotation axis of the wheel; an inertial member that is fixed to the cylindrical rotor and maintains a constant attitude by its own weight; a circuit board that is fixed to the stator and is mounted with a power feeding circuit to supply an output of the generator to a load; and a circuit receiving space that is provided inside the cylindrical rotor and receives a whole of the circuit board or an element that is mounted on the circuit board and protrudes from the circuit board.

Abstract: A valve stem to be mounted to a valve mounting hole of a tire wheel includes a stem body that is pipe-shaped, contains a valve core inside, and has a proximal end to which an electrical circuit unit is fixed, and a cover member made of elastomer and covering an outer side of the stem body. The valve stem includes an engagement groove formed on an outer circumferential surface of a proximal end of the cover member to engage with an opening edge of the valve mounting hole, and a weight adjustment member having a higher specific gravity than the cover member and made of a material different from that of the stem body. The weight adjustment member is embedded in the cover member and positioned closer to a distal end of the cover member than the engagement groove.

Abstract: A transmitter includes a power source of the transmitter, a condition detecting section that detects a condition of a tire, a data generating section that generates transmission data that contains tire condition data indicating the condition of the tire detected by the condition detecting section, a transmitting section that modulates the transmission data and transmits the modulated data, a storage section storing a correspondence relationship in which values of a specific bit among bits of the transmission data that change as the wheel assembly rotates are respectively assigned to specific angles set for the rotation angle of the wheel assembly, and a transmission control section that transmits the transmission data from the transmitting section when detecting that the rotation angle of the wheel assembly is any of the specific angles.

Abstract: A tire valve includes a grommet fitted on an outside of a valve stem on a proximal end side, the tire valve being inserted into a valve attachment hole from a distal end side, the grommet having a proximal end portion engaging with the valve attachment hole, a stem step portion provided on an outer surface of the valve stem and increasing in diameter at the proximal end side and facing toward the distal end side, a ring provided on the grommet in a portion on the distal end side of the stem step portion and restricting axial movements of the ring relative to the grommet, and a pressed portion provided on the grommet between the stem step portion and the ring to be pressed between the stem step portion and the ring wherein the grommet receives a load applied toward the proximal end side of the valve stem.

Abstract: An in-tire electric device having a bracket and an electric circuit unit detachably held by the bracket includes: an engagement protrusion and an engagement hole provided on the electric circuit unit and the bracket to engage with each other to restrict, through a two-step operation where the electric circuit unit is moved in a first direction and then moved or rotated in a second direction intersecting the first direction, all movements and rotations except for a reverse of the second direction; a retainer mounted on the bracket from a direction intersecting the second direction and facing the electric circuit unit in the second direction to restrict the electric circuit unit from moving in the second direction; and retainer locking portions formed on the bracket and the retainer and engage with each other by elastic deformation of one of the retainer locking portions to lock the retainer to the bracket.

Abstract: A fastening bolt fixes a plurality of stacked plates on each of which a hydraulic integrated circuit for hydraulically controlling an automatic transmission or a continuously variable transmission is formed. The fastening bolt includes a communication passage that communicates between the hydraulic integrated circuits among the plurality of plates.

Abstract: A reception control section obtains the rotation angles of wheel assemblies when receiving transmission data by a reception circuit. The reception control section divides 360°, which is the range of the possible rotation angles of the wheel assembly, into equal parts to obtain angle ranges and assigns each of the obtained rotation angles to one of angle ranges. The reception control section derives the angle range in which the number of times (frequency) the obtained rotation angles are included is a maximum value. The reception control section calculates a reception-side angle difference, which is the difference between the median values of the angle ranges in which the number of times the obtained rotation angle is included is a maximum value. The reception control section associates the ID codes with the wheel assemblies based on the correspondence between the reception-side angle difference and the angle difference between specific angles.

Abstract: A flow control valve in which a needle-shaped valve element is fitted into a valve hole provided in a partition wall partitioning a flow path at an intermediate portion, and the valve element moves in an axial direction of the valve element to control a flow rate of a fluid passing between an outer side surface of the valve element and an inner side surface of the valve hole, the flow control valve includes: a tapered inner side surface that is included in the inner side surface of the valve hole; and a tapered outer side surface that is included in the outer side surface of the valve element, faces the tapered inner side surface from inside, and is inclined along the tapered inner side surface.

Abstract: A bracket that is pressed against and fixed to an outer peripheral surface of a rim of a tire wheel by a belt wound around the outer peripheral surface of the rim, and detachably holds an electric circuit unit includes: a pair of rim contact portions that are provided at both ends in a circumferential direction of the rim in a rim facing surface facing the outer peripheral surface of the rim, and come into contact with the outer peripheral surface of the rim in such a way as to cause a portion between the both ends to be spaced apart from the outer peripheral surface of the rim.

Abstract: A vehicle has a detecting section that detects, as a detection value, a rotational angle of each wheel assembly. A transmitter provided in each wheel assembly transmits transmission data when the rotational angle of the wheel assembly is any of specific angles. At the performance of transmission at the specific angle, the transmitter changes data that is different from angular data indicating the rotational angle of the wheel assembly and is included in the transmission data in accordance with the specific angle. A vehicle-mounted receiver collects the detection values detected by the detecting section upon reception of the transmission data. The receiver collects the detection values for each piece of the transmission data transmitted at the same specific angle based on a manner in which data included in the received transmission data is changed in accordance with the specific angle.

Abstract: A valve core includes: a barrel part that is cylindrical; a barrel packing that surrounds an outer lateral surface of the barrel part; a washer through which the barrel part penetrates and which abuts on the barrel packing from above; and a head part that includes a male screw part at its outer lateral surface and that rotates relative to the barrel part, wherein a lower surface of the head part abuts on the washer from above.

Abstract: A fuel solution introducing method introduces a fuel solution into a tire. The tire includes a transmitter configured to transmit data that includes a detection result detected by a sensor to a receiver. The transmitter is operated with, as a power source, an organic power generation element configured to generate power through a chemical reaction with organic matter contained in the fuel solution. The fuel solution introducing method includes introducing the fuel solution and gas into the tire from a tire valve arranged on a wheel to which the tire is attached.

Abstract: A road surface information collection device includes a first sampling unit that samples acceleration sensor's detection results with a first sampling cycle to obtain first sampling data, a position calculator that calculates an acceleration sensor's rotational position based on changes in first sampling data, a second sampling unit that is activated based on a condition that the acceleration sensor is positioned within a first predetermined range including a back side of a point on the tire in contact with the ground, and that samples detection results of the acceleration sensor with a second sampling cycle shorter than first sampling cycle to obtain second sampling data as the road surface information, a speed calculator that detects a rotation speed of the tire based on changes in the first sampling data, and a first predetermined range determination unit that changes the first predetermined range in accordance with the rotation speed of tire.

Abstract: A connector to connect electric circuits inside and outside the tire includes: a tubular terminal penetrating the connector attachment hole; an outer seal member surrounding outside the tubular terminal and elastically deformed by being pressed against a tire wheel to provide a seal between the tire wheel and the tubular terminal; an inner seal member filled inside the tubular terminal; one or more rod-shaped terminals penetrating the inner seal member; a plurality of communication holes formed at a plurality of positions in a circumferential direction in an intermediate portion in an axial direction of the tubular terminal; and a plurality of seal communication portions integrally formed with one or both of the outer seal member and the inner seal member and arranged in the plurality of communication holes to transmit, to the inner seal member, elastic force toward the tubular terminal by the elastic deformation of the outer seal member.

Abstract: A steering control system includes a steering-motor for turning wheels, a reaction-force-motor for applying a reaction torque to a steering of the vehicle, and a controller. The controller calculates a turning angle based on a first-characteristic representing a relationship of the turning angle to a steering angle, and calculates a reaction torque based on a second-characteristic representing a relationship of a reaction torque to the steering angle. The controller changes the first-characteristic from a characteristic corresponding to a first-state to a characteristic corresponding to a second-state in response to a change in the state of the vehicle from the first-state to the second-state. The controller maintains the second-characteristic at the characteristic corresponding to the first-state when the state of the vehicle changes from the first-state to the second-state in the case where the steering angle is steered to a steering limit corresponding to an upper limit of the turning angle.

Abstract: An acceleration detecting device includes a power source, an acceleration sensor, an acquiring section, a rotation period calculating section, and an acquisition period setting section. The acceleration sensor is configured to detect a centrifugal acceleration generated by rotation of a wheel assembly. The acquiring section is configured to acquire a detection value from the acceleration sensor with a predetermined acquisition period, thereby acquiring the detection value from the acceleration sensor each time the wheel assembly rotates a constant angle. The rotation period calculating section is configured to calculate a rotation period of the wheel assembly. The acquisition period setting section sets the acquisition period. The acquisition period setting section is configured to increase a number of times the detection value is acquired from the acceleration sensor per rotation of the wheel assembly as the rotation period calculated by the rotation period calculating section becomes longer.

Abstract: A valve core includes: a core body screwed with a female screw part of a core mounting hole and formed of a seal ring, and a support base including a male screw part and a sleeve part; a shaft part penetrating through the support base; a valve body provided at a tip of the shaft part; an overhang part provided at the sleeve part so as to laterally overhang from a basal end of the sleeve part; a plate part provided at the support base so as to project to a basal end side from the basal end of the sleeve part and having a pair of flat tool abutting surfaces; and a shaft receiving hole penetrating through the plate part. The seal ring has a shape of a ring whose cross-sectional shape is quadrangular and the overhang part and the seal ring abut on each other by their surfaces.