摘要:
A wavelength detector in which reference light (31) generated in a reference light source (30) and light (11) to be detected are directed to an etalon (62), and the light that has transmitted through the etalon is detected by light detecting means (64). The front focal surface (50) of a collimator lens (61) is irradiated with the reference light and the light to be detected. These lights are converted into parallel rays through the collimator lens and fall on the etalon. The reference light and the light to be detected that have passed through the etalon are focused by focusing lens means (63) on the detecting surface of light detecting means to form thereon interference fringes that correspond to the reference light and the light to be detected. Based on the interference fringes, relative wavelength of the light to be detected to the reference light, i.e., the absolute wavelength of the light to be detected, is measured.
摘要:
A crawler produced so as to prevent the occurrence of dislocation of a wheel, stabilize the running of the rotating wheels, minimize the vibrations of the wheels and enable a core bar-containing endless rubber belt to double as an endless iron caterpillar. This crawler is provided with a plurality of outer flange-carrying wheels (3) each of which has flange portions (3b, 3b') projecting from both of the outer side parts of a central inner wheel portion and extending in the radially outward direction, and an endless rubber belt (4) containing core bars (10) therein or a shoe link-carrying endless iron caterpillar (1), which is wrapped around these outer flange-carrying wheels (3). The rubber belt (4) is formed so that the rolling surfaces of the flange portions of the outer flange-carrying wheels contact the exposed shoulder portions (13a, 13b, 13a', 13b') of the core bars (10). The iron caterpillar is formed so that the rolling surfaces (3a) of the central inner wheel portions of the outer flange-carrying wheels contact the upper surfaces of the shoe links.
摘要:
A driving control device and a control method therefor suitable for industrial vehicles, particularly for construction vehicles such as a hydraulic power shovel, which makes it possible for a driver to drive a vehicle in a desired direction easily without any illusion. To accomplish this object, the method of the invention comprises tilting a driving lever in a desired driving direction, detecting the angle of the operation direction by a lever angle detector, detecting a relative angle of rotation between an upper swivelling member and a lower driving device by a car body swing encoder, sending these signals to a controller, judging the swinging direction of the lower driving device through the calculation by the controller, sending then the output signal to a driving operation valve to swing the lower driving device without travelling, stopping it when the lower driving device becomes parallel to the operation direction of the driving lever, and moving straight the lower driving device in the operation direction of the driving lever. The angle of the operation direction of the driving lever and its tilt angle may also be detected by the lever angle detector and then the lower driving device may be swung without travelling at a speed proportional to the tilt angle of the operation lever or may be moved straight. Furthermore, the lower driving device may be swung without travelling and driven by detecting the angle between an upper swing body and the direction of north of terrestrial magnetism by a gyrocompass.
摘要:
A mechanical-hydraulic transmission gear and a method of controlling the same which are used for construction vehicles or machines, and which are designed in such a manner that, when a motor is rotated at a high speed, the transmission of the power is carried out via a mechanical transmission gear alone to control a hydraulic power loss to substantially zero, and in such a manner that, when the motor is rotated at a low speed, the transmission of the power is carried out via a hydraulic transmission gear alone to make easier a speed control operation and a forward and reverse rotation switching control operation. This mechanical-hydraulic transmission gear includes a hydraulic transmission gear (10) having a hydraulic pump (11) and a hydraulic motor (13), a mechanical driving gear (30), a forward and backward movement change-over means (26), a speed control means (27), a means (22) for detecting the rotational speed of an output shaft (14), and a control means (20) adapted to compare the signals from the forward and backward movement change-over means, speed control means and rotational speed detecting means and carry out the controlling of the connection and disconnection of a clutch (31) for an input shaft (2) in the mechanical transmission gear and the controlling of the capacities of the pump and the hydraulic motor. The method of controlling the mechanical-hydraulic transmission gear includes the steps of disconnecting the clutch for the mechanical transmission gear when the rotational speed of the output shaft is lower than a predetermined level, to transmit the power by the hydraulic transmission gear alone, and connecting the clutch for the mechanical transmission gear when the rotational speed of the output shaft is higher than the predetermined level, to transmit the power by the mechanical transmission gear alone, and minimize in accordance with a command from the control means the power absorbed into the hydraulic transmission.
摘要:
A parking brake circuit for a hydraulically driven vehicle which prevents the occurrence of an erroneous operation at the time of driving on the downward slope. The circuit comprises first and second main circuits (2,3) for supplying a hydraulic oil to a hydraulic motor (1) for driving, a counterbalance valve (4) disposed between these main circuits and passing the hydraulic oil on the high pressure side to a pressure reception chamber (6a) of an actuator (6) for actuating a parking brake, a conduit line (5) for connecting the output port of the counter balance valve to the pressure reception chamber and a slow return valve (12) disposed in the conduit line in such a manner as to regulate the flow of the hydraulic oil flowing from the pressure reception chamber to the counterbalance valve.
摘要:
This invention relates to an operation valve device for supplying a pressure oil to an actuator such as a hydraulic cylinder and a hydraulic motor. This operation valve device includes first and second oil ports (3, 4) for causing the pressure oil supplied to an input port (2) communicating with a pump (P) to flow out selectively into pressure chambers (B1, B2) on both sides of an actuator (B) through outlet ports (6, 7), first and second communication ports (12, 13) bored concentrically and facing each other in such a manner as to allow the first and second oil ports to communicate with a tank port (10), first and second valve ports (14, 15) bored concentrically and continuously outside the first and second communication ports, respectively, a pair of support shafts (16, 16) inserted into each of these valve ports in such a manner as to face each other, vacuum prevention valves (9, 9) fitted to the tip of these support shafts so as to open and close the communication ports, respectively, and check valves (8, 8) fitted into the intermediate portion of the support shafts in the axial direction so as to prevent the outflow of the pressure oil from the first and second oil ports to the input port side, respectively. Since the vacuum prevention valves (9, 9) and the check valves are disposed on the concentric support shafts, the operation valve device of the present invention is compact in size and can reduce oil leakage.