摘要:
A vibration-sensing gyro composed of a light alloy such as duralumin includes a base and a first pair of tines projecting parallel to each other from the base. Piezoelectric elements are mounted on the root of the side faces of the first pair of tines to excite the first pair of tines along an X axis. The vibrations of the first pair of tines along the X axis are then propagated to a second pair of tines to vibrate the second pair of tines along the X axis. Piezoelectric elements are mounted on the root of the upper and the lower faces of the second pair of tines to detect vibrations of the second pair of tines along an Y axis. When the second pair of tines receives the Coriolis force based on an angular velocity .omega. around a Z axis and vibrates along the Y axis, the vibrations along the Y axis are detected as electric signals (alternating current voltages) by piezoelectric effects of the piezoelectric elements.
摘要:
The invention provides a vibration-sensing gyro, where resonance frequencies of tines are adjusted adequately in a simple manner. A vibration-sensing gyro (10) of the invention is made of a light alloy plate like duralumin and includes a first tine (14) and a second tine (16) disposed parallel to each other and projecting from a base (12). When the first tine (14) has a length l1, a width w1 along the X axis, and a thickness t1 and the second tine (16) has a length l2, a width w2 along the X axis, and a thickness t2 (=t1), the first tine (14) and the second tine (16) hold the relationship of l2/.sqroot.t2=l1/.sqroot.w1. In other words, the tines (14,16) and the base (12) are manufactured to satisfy this relationship. Such definition of the dimensions makes a resonance frequency fx1 of the first tine along the X axis coincide with a resonance frequency fy 2 of the second tine 16 along the Y axis.
摘要:
In a three-dimensional coordinate space of X, Y, and Z, there are provided a vibrator having a vibrator base extending in the X-direction on the XY plane, a first vibrating bar projecting in the positive Y direction from the vibrator base and having a first natural frequency in the X-directions, and a second vibrating bar projecting in the negative Y direction from the vibrator base and having a second natural frequency in the X-directions, different from the first natural frequency; excitation means for exciting either the first or second vibrating bar in the Z-directions or in the X-directions; detection means for detecting the amplitude of vibration orthogonal to the Y-directions and to the directions of excitation of vibration caused in the first or second vibrating bar by the excitation means; and angular velocity calculating means for calculating an angular velocity of rotation about an axis in the Y-direction from the magnitude of the amplitude detected by the detection means, and the geometric dimensions of the first and second vibrating bars are determined so as to prevent the vibrator base from vibrating in the Z-directions when the first or second vibrating bar is excited by the excitation means. As so constructed, the angular velocity can be detected with high accuracy.
摘要:
A gear mechanism having extremely less backlash, capable of suppressing the rattling noise of gears, having a large loading resistance in the thrust direction, and capable of transmitting high torque by using the gears transmitting a force by the meshing of the gears with each other in place of the transmission of the force by friction. The gear mechanism is formed by disposing the plurality of spur gears in the meshed state with each other. The screw-like gears (2) and (4) are disposed on the same axis as the spur gears (1) and (3) in the meshed state with each other. The screw-like gears (2) and (4) adjacent to each other are formed in screw shapes having lead angles extending in the reverse directions to each other and equal in angle to each other. The spur gear (1) and the screw-like gear (2) are rotated integrally with each other to transmit its rotation to the spur gear (3) and the screw-like gear (4) adjacent to each other.
摘要:
A magnetic rotation detector is composed of a rotary element alternately magnetized with north and south magnetic poles in a circumferential direction and arranged to rotatable about a rotational axis, a magnetoresistance element arranged to be opposed to the magnetized portion of the rotary element, the magnetoresistance element including a linearly patterned superlattice composed of alternately layered magnetic and nonmagnetic metals, and a signal processing circuit placed in a remote position apart from the magnetoresistance element and connected to a pair of terminals of the superlattice to produce a series of pulse signals based on variation of the resistance value of the superlattice caused by change of intensity of a field of the rotary element.
摘要:
To suppress dispersion of detection sensitivity due to a change in ambient temperature in a vibration type angular velocity detecting apparatus. An angular velocity detecting apparatus comprising a vibrator, excitation means for exciting the vibrator, detecting means for detecting an amplitude of vibration based on Coriolis' force occurring with rotation of the vibrator excited to vibrate by the excitation means, and angular velocity calculating means for calculating an angular velocity of the rotation from a magnitude of the amplitude detected by the detecting means, wherein in an X, Y, and Z, three-dimensional, orthogonal coordinate space, the vibrator has a vibrator base extending in the X-direction on the XY plane, two first vibrating bars projecting in the direction of +Y from the vibrator base and at substantially symmetric positions with respect to a Y-directional axis passing a central portion of the vibrator base, two second vibrating bars projecting in the direction of -Y from the vibrator base and at the same X-directional positions as the two first vibrating bars, and a single supporting rod having prescribed torsional rigidity, projecting from the central portion of the vibrator base, and fixed at the tip thereof to a body to be detected.
摘要:
A detecting apparatus which detects a quantity of various kinds of vehicle motion without using materials arranged on a road surface. The detecting apparatus is provided on a vehicle. A marking mechanism provides a mark on a road surface, the marking mechanism provided on the vehicle. An imaging device takes images of the road surface including the mark at a predetermined time interval. A quantity of vehicle motion is calculated by detecting a change in a position of the mark during the predetermined time interval based on a plurality of the images.
摘要:
A planetary gear device having a novel planetary gear mechanism, the device being capable of solving problems of conventional devices.A planetary gear coaxially integrally has at least two, first and second gears (B, E) having different numbers of teeth. One of sun outer gears or sun inner gears having two fundamental axes has at least two, third and fourth gears (C, F) capable of respectively meshing with the first and second gears (B, E) of the planetary gear and of rotating relative to each other. The ratio of the numbers of the teeth of the first gear (B) and the third gear (C) is different from the ratio of the numbers of the teeth of the second gear (E) and the fourth gear (F). The other of sun outer gears or sun inner gears having one fundamental shaft coaxially integrally has at least two, fifth and sixth gears (A, D) respectively meshing with the first and second gears (B, E). The ratio of the numbers of the teeth of the first gear (B) and the fifth gear (A) is the same as the ratio of the numbers of the teeth of the second gear (E) and the sixth gear (D).
摘要:
An object of the present invention is to perform motion conversion between a rotary motion and a linear motion accurately, stably, and efficiently with a relatively simple structure through combination of aplanetary gear mechanism of helical gears and a planetary gear mechanism of screw gears. A sun shaft 14, planetary shafts 20, and a ring shaft 16 having respective axes of rotation in parallel with one another are provided. A helical sun gear 22, helical planetary gears 28, and a helical ring gear 42 are provided on the sun shaft 14, the planetary shafts 20, and the ring shaft 16, respectively, and cooperatively constitute a first planetary gear mechanism. A screw sun gear 26, screw planetary gears 30, and a screw ring gear 44 are provided on the sun shaft 14, the planetary shafts 20, and the ring shaft 16, respectively, and cooperatively constitute a second planetary gear mechanism. Either of the gear ratio of the screw sun gear 26 to the screw planetary gears 30 and the gear ratio of the screw ring gear 44 to the screw planetary gears 30 differs from the gear ratio of the helical sun gear 22 to the helical planetary gears 28 and from the gear ratio of the helical ring gear 44 to the helical planetary gears 28.
摘要:
The object of the present invention is to convert a rotary motion into a linear motion more precisely than ever by utilizing the principles of a planetary gear mechanism and a differential screw. The rotary/linear motion conversion device of the present invention has a screw shaft 20, a plurality of planetary screw rollers 36 mating with the screw shaft therearound, and a roller nut 24, with the screw shaft 20 and the planetary screw rollers 36 mating with one another by threads of opposite winding directions, while the planetary screw rollers 36 and the roller nut 24 mate with one another by threads of a same winding direction, wherein the respective threads are of a common pitch, and the number of co-extending threads of either of the screw nut and the roller nut is varied from that which satisfies the condition that neither of the screw shaft nor the roller nut moves linearly relative to one another in spite of a relative rotation thereof along with rotation and revolving of the planetary screw rollers relative to the screw shaft and the roller nut with no slippage.