摘要:
A method of making a conical spray opening for a perforated valve spray disk by electrical discharge machining. During electrical discharg machining by an electrode, particles are removed by flushing in a direction opposite the direction of electrical discharge machining and counterflushing by a second dielectric after the opening has been created in a direction opposite from the electrical discharge machining, resulting in the opening having a conical shape.
摘要:
An electromagnetically operated injection valve including a return spring having upper and lower ends, the upper and lower spring ends are bent to extend axially and parallel with a valve's longitudinal axis. The upper end of the spring engages a recess of a fixed setting bushing, and the lower end engage in a recess of a needle sleeve so as to prevent twisting. Due to the position of a valve seat body relative to the valve closing member the same angle is maintained throughout the life of the assembly, the adaptation process of both components is reduced to a single running-in phase. The new injection valve is particularly suitable as an injection valve for fuel injection units of mixture compressing spark ignited internal combustion engines.
摘要:
A fuel injection valve and method in which a valve part consisting of a valve seat body and a support body with injection holes is pushed into a longitudinal orifice of a housing and firmly connected to a wall of the housing with the insertion depth determining the presetting of a valve needle lift. The precise setting of the valve needle lift is made on a fully assembled valve by deforming the valve part between fixing areas of the support body. The injection valve and the method of manufacture of the injection valve are particularly suitable for fuel injection units of mixture compressing engines with externally supplied ignition.
摘要:
A novel valve, including a restoring spring which is pressed into a spring chamber opening and is held in the spring chamber opening by a radially oriented tension on one end of the spring; the depth to which the restoring spring is pressed determines the magnitude of the spring force acting upon the valve closing part. By dispensing with an adjusting sheath, not only is the danger of chip formation in the press-fitting operation lessened, but the production cost of the valve is reduced substantially as well. The valve is used as a fuel injection valve for fuel injection systems.
摘要:
The testing device for measurement of a hydraulic leak rate of a spraying valve (11) with a closable outlet opening(11B) includes a vessel (10) filled with an indicating liquid (12) and a device for holding the valve to be tested with the outlet opening (11B) in an inclined position pointing downward into the indicating liquid during testing, a riser tube (14) formed as a glass capillary tube connected with the vessel (10), a balancing reservoir (17) also connectable with the vessel (10) but disconnectable from the vessel (10) with a shutoff valve (15), a light source (18) positioned relative to the riser tube (14) so as to illuminate the riser tube (14) and the liquid level (M) in the riser tube (14) and a linear scanning camera (19) positioned relative to the riser tube (14) so as to observe the height (H) of the liquid level (M) in the riser tube for accurate measurement of a change in the height (H) of the liquid level M when the closed valve is pressurized. The leak rate is calculable from the change in height of the liquid level as measured accurately by the linear scanning camera, the cross sectional area of the liquid in the riser tube and the measurement time.
摘要:
A rotary mower with at least one rotary cutter unit rotated on a vertical axis by means of a drive shaft which has a first bearing hub secured to its lower end. A cutter disc is secured to the first bearing hub and a second bearing hub is coaxially and rotatably mounted on the first bearing hub. A rigid intermediate disc is secured to the second bearing hub so as to be disposed beneath the cutter disc. A skid disc on a third bearing hub is disposed coaxially beneath the intermediate disc in such a way that its central portion can be axially adjusted by means of an adjustment device to change the height of cut. The skid disc is elastically flexible with its outer rim engaging the outer rim of the intermediate disc in all positions of height adjustment.
摘要:
Alkyl (6R,7S,8R)-6,9-dihydroxy-7,8-isopropylidenedioxy-2,4-nonadienoates of the formula I ##STR1## where R is alkyl of 1 to 4 carbon atoms are prepared by reacting 3,5-O-isopropylidene-D-arabinose of the formula II ##STR2## with a 3-carboalkoxyprop-2-en-1-ylidene triphenylphosphorane of the formula III ##STR3## in a solvent at elevated temperatures, by a process wherein the reaction is carried out in, as the solvent, a suitable aliphatic or aromatic hydrocarbon, a halogen derivative thereof or a cycloaliphatic ether, preferably an aromatic hydrocarbon of 6 to 8 carbon atoms, at from 65 to 130.degree. C., preferably from 80 to 115.degree. C.Using this process, the basic skeleton of d-biotin can be synthesized from D-arabinose in substantially better yields than obtainable hitherto.
摘要:
This mower has a mower beam with at least one rotating mowing device joined on the mower beam and also on a carrying beam arranged on the hitching mount, which in the forward movement of the machine is arranged in front of and above the mower beam, whereby the carrying beam is coupled somewhat in the center of the hitching mount behind the tractor about a vertical pivot axis and whereby the carrying beam outboard half from the hitching mount is somewhat in its center provided with a horizontal pivot axis in order to permit the outer part of the carrying beam carrying the mowing device to swing upwardly by means of a hydraulic cylinder.
摘要:
A height adjuster for an agricultural implement, such as the crop pickup device of a field chopper, picker, thresher or like machine having an intake or pickup unit drawing the crop to a chopper or blower, has at least one movable front point or shoe which is swingable about an axis transverse to the direction of travel and rides on the ground. Within this shoe switches are provided to respond to the pivotal movements of the shoe and control a hydraulic cylinder for lifting or lowering the pickup unit to conform to changes in the ground contour.
摘要:
A device for protecting a user includes a first current path including a first and second conduit, and a monitoring device for detecting an imminent overload of the electric user. In an embodiment, the monitoring device includes a first temperature measurement unit, a support, an evaluation unit and a first transducer to produce an electrically conductive connection between the first and second conduits of the first current path. The first temperature measurement unit is, electrically insulated from the first transducer and includes a first temperature sensor. An additional electrically insulating material; is arranged on a first lateral surface of the support between the first transducer and the support and the first temperature sensor is arranged on the support to detect a temperature of the first transducer. The evaluating unit is configured to detect an imminent overload at the user on the basis of temperatures detected by the first temperature sensor.