Abstract: The present invention discloses an inspection tool for surface of paint that is capable of detecting if a diameter of the minimum surface without paint of a mounting surface of a bolt hole is qualified, and if a height of surface without paint of side wall of a bolt hole as a counter hole exceeds a given range. The present invention is of simple structure and is convenient for use.

Abstract: A bearing gap measuring device can measure a gap of a bearing to judge whether the bearing is damaged. The bearing gap measuring device includes: a pressure generating device configured to selectively supply a positive pressure and a negative pressure, which have a certain pressure, to an interior of a cylinder; and a displacement measuring device penetrating a cylinder head and applying a force to pull or push a piston by a sequential generation of a positive pressure and a negative pressure in the cylinder. In particular, the displacement measuring device includes a probe rod to contact with an upper face of the piston such that the probe rod is moved in a longitudinal direction to measure a height change amount of the piston.

Abstract: A cylinder block assembly includes a cylinder block having cylinders and a plurality of crank caps fixed to the cylinder block. The crank caps are arranged such that one of the crank caps is disposed on each of both sides of each of the cylinders in the alignment direction and among the plurality of crank caps arranged in line, each of a center crank cap located at a center position and two side crank caps respectively located at both ends has a hole or a groove in such a manner as to be more easily deformable than intermediate crank caps each of which is located between the center crank cap and one of the side crank caps when a load is received from the crankshaft.

Abstract: A system for detecting mechanical failure of a connection between a variable differential transformer and a controlled element. The sensor system includes a variable differential transformer with a housing encapsulating a first coil, a bore in the housing, wherein the bore is adjacent to the first coil, a core disposed in the bore, a shaft connectible between the core, at a first end, and the controlled element, at a second end, and a biasing element connected to the shaft. Responsive to a break in the shaft, the biasing element moves the core to an out-of-range position detectable by at least the first coil.

Abstract: A crankshaft balancer machine for balancing a crankshafts having a measurement station configured to rotate the crankshaft to obtain vibration-related data, a transfer station configured to transfer the crankshaft between the measurement station and the correction station, and a correction station configured to drill at least a portion of the crankshaft to correct an imbalance in response to the imbalance data. The measurement station includes a base structure, a measurement bridge support, a plurality of flexural support legs extending therebetween, at least one sensor, and a drive system to spin the crankshaft and output imbalance data. The transfer station includes at least one lifting arm selectively engaging the crankshaft and supporting the crankshaft during transfer. The correction station includes a drilling device horizontally disposed to achieve a horizontal drill direction into the crankshaft to correct any imbalance according to a customized software protocol.

Abstract: A device for measuring edge and rounding features on a piston ring includes a planar support element for the piston ring, a stop operatively connected thereto for bearing defined piston ring sections thereon, and a measuring unit, which is disposed at a predefinable angle with respect to the support element or the stop.

Abstract: To provide a piston ring tension measurement apparatus which can stably measure a piston ring for suitable tension, the piston ring tension measurement apparatus of the present invention comprises: a table 1 which supports a measured piston ring 5; a first band 3 which is to be wound around an outer circumferential part of the measured piston ring 5 and which is fastened at its two end sides by fasteners 4 and 6; a second band 8 which is to be wound around an outer circumferential part of the measured piston ring 5 where the first band 3 is not wound; a fastener 11 for fastening one end side of the second band 8; a tension imparting means 14, 15, and 16 for making the second band 8 move in a direction squeezing the measured piston ring 5; and a load cell 10 which measures a tension which is imparted to the second band 8.

Abstract: To increase precision in straightness on a journal thrust surface relative to an outer peripheral surface of a journal in a crankshaft, a control system is provided for controlling movement of a cutter in axial directions by running a control program transferred from an automatic programming apparatus. The automatic programming apparatus corrects machining data on the basis of data for correcting the straightness gained through a comparison between results of a measurement of machining dimensions of the journal thrust surface in the workpiece on which a cutting process has been carried out and target machining dimensions for the journal thrust surface. A control program is prepared on the basis of the corrected machining data after correction of the machining data.

Abstract: A support device for a piston ring comprising a circular support defining a bore having an interior support surface to provide circumferential support to a piston ring. Also disclosed is a kit comprising a plurality of circular supports.

Abstract: A support device for a piston ring comprising a circular support defining a bore having an interior support surface to provide circumferential support to a piston ring. Also disclosed is a kit comprising a plurality of circular supports.

Abstract: A position-measuring device for fluidic cylinder-and-piston arrangements having at least one Hall sensor, preferably arranged in the area of the cylinder wall, especially in a cylinder wall, and a magnetic region, arranged in the piston. At least one Hall sensor array has at least two Hall sensors spaced one from the other in the direction of movement of the piston. One coil is provided whose magnetic field permits the switching points of the Hall sensors to be adjusted in response to the coil current.

Abstract: A device (10) adapted to position a ring (R) in the bore (B) of a cylinder (C) so that the ring (R) is perpendicular to the axis of the cylinder (C) includes a first segment (11) and a second segment (12). The first segment (11) has a tongue (20) which is slidably received in a groove (34) in the second segment (12). A threaded shaft (37) of a hand screw (35) is received through the groove (34) and into a threaded aperture (21) in the tongue (20) to attach the first segment (11) to the second segment (12). Arcuate surfaces (18) and (27) of the first and second segments (11, 12), respectively, define a portion of the circumference of a circle approximately the diameter of the bore (B) when the segments (11, 12) are attached to each other. The ring (R) is positioned in the bore (B) and the device (10) is inserted in the bore (B) until the lip (19, 28) of the first and second segments (11, 12) rest on the top edge of the cylinder (C).

Abstract: An angle-measurement device comprising a carrier element with at least two tracers. At least one tracer is configured as an annular surface, and at least one tracer is configured as a cylindrical surface. Each tracer has essentially coinciding periodic patterns that are electromagnetically or optically detectable by at least one sensor, and one tracer has a number N of patterns and the other tracer has a number N+1 of patterns. In another embodiment, one tracer is disposed on one face and the other tracer is disposed on another face of an annular carrier element.

Abstract: An operating apparatus and method for a bearing clearance detector. The apparatus is arranged such that an air pressure and vacuum may be applied to a probe inserted into the cylinder of an engine. The operator may apply the vacuum in incremented steps while observing the readings of a micrometer mounted on the probe. The “steps”required for proper bearing clearance readings are readily observed.

Abstract: On a hard-rolling machine (41) for crankshafts (1) there is provided a plurality of measuring probes (4) corresponding to the number of main bearings (3) to be measured, which are arranged on a measuring-probe bridge (6) with the mutual spacing (5). The measuring-probe bridge (6) is detachably connected via quick couplings to the free ends of swivel arms wherein as cable connection between the measuring probes (4) and an evaluation device there is provided a detachable cable plug which connects each measuring probe (4) to the evaluation device. The measuring-probe bridge (6) can be removed from the hard-rolling machine (41) together with the cable plug and then re-attached thereto, depending on which type of crankshaft (1) is to be hard-rolled.

Abstract: A piston ring locating system includes a resilient ring fabricated in a generally circular configuration having a short height and a length of between about 2 inches and 5 inches with overlapping free ends. One of the ends has a slight bend there adjacent for fitting inside the opposite end. The rings are outwardly biased resiliently to allow varying the circumference of the ring as a function of the cylinder in which it is to be placed. The ring thus forms an interior surface and an exterior surface positionable within the cylinder in which it is to be placed. The ring has a top edge and a bottom edge constituting an abutment surface. Projection means extends outwardly from the exterior surface to a short distance and is adapted to be located on the upper edge of the block of the cylinder with which it is to be utilized.

Abstract: An apparatus for measuring tension of piston rings includes a cylindrical support fixture having a circumferential groove formed therearound for receiving and holding a piston ring. A rigid base supports a plurality of components of the apparatus. A strong, thin band, formed from a material sufficiently strong to withstand repeated applications of pulling force thereto, is mounted to the base, and is held between two clamps. The band has a loop formed therein, for receiving the support fixture with a piston ring mounted therein. The apparatus also includes reciprocally movable structure for tightening the band around the support fixture, such as a slidably movable clamp assembly at one end of the band. The apparatus further includes mechanism for measuring tension on the band, and fluid activatable mechanism for vertically reciprocating a portion of the support fixture. In a preferred embodiment, the reciprocating mechanism is pneumatically activatable, such as by compressed air.

Abstract: A method for pre-positioning the driveshaft sections of an axially adjustable driveshaft assembly prior to installation within a vehicle to facilitate the installation process. An installation tool is provided with first and second members which are movable relative to one another. Reference indicia are provided on one or both of the members such that mounting surfaces provided thereon can be spaced apart from one another by a predetermined amount. The mounting surfaces of the installation tool are mounted on separate sections of the driveshaft assembly. Then, the driveshaft sections are moved relative to one another until the reference indicia provided on the installation tool are properly aligned. When such alignment is achieved, the overall axial length of the driveshaft assembly is approximately equal to the desired length between the engine/transmission assembly and the axle assembly. Then, the installation tool is removed, and the driveshaft assembly is installed in the vehicle.

Abstract: A piston ring gap measuring device for a vehicle includes a master bore having a guide slit on one side and a thickness gauge on the other side. A tolerance scale is provided adjacent to the guide slit and corresponds to tolerance thicknesses of the thickness gauge. A piston ring may be placed onto a ring supporting disk and moved downwardly into the master bore until the piston ring gap encounters a part of the thickness gauge having a thickness dimension greater than the gap thickness. The gap thickness can be obtained from the tolerance scale. The ring supporting disk includes guide tabs movable within grooves in the master bore, and the ring supporting disk is biased upwardly.

Abstract: A device and a method for determining big end bearing and wrist pin bearing wear in a piston engine without complete disassembly of the engine. The device includes a probe rod which moves in response to the movements of the piston in a cylinder being tested. The position of the probe rod is transduced to an electrical signal which is inputted to a microcomputer. The method uses the piston position obtained via the probe rod and the crank throw angle to calculate the total amount of wear in the big end bearing and the wrist pin bearing. The results of the calculation are then sent to a display which forms part of the bearing inspection device of the present invention.

Abstract: The invention relates to a method of, and apparatus for, determining the clearance between wear surfaces of a reciprocating piston engine and the surrounding cylindrical bore of the engine block, without need for physical contact with the piston. As particularly distinguished from the prior art, the present invention employs an energy wave source, collimated to impinge against selectable portions of the piston head either during its reciprocation, or at rest, in the so-called combustion or compression chamber between the moving piston and the engine cylinder. The energy source may be optical, electro-optical, acoustico-optical, or electromagnetic, generating continuous waves or high frequency pulses, or which are capable of reflecting such energy back to a plurality of detectors Such detectors are capable of measuring exceptionally high frequency (short wave lengths) signals to measure time (and hence distance) from the source to the piston head back to the detector.

Abstract: A piston-type internal combustion engine includes an engine cylinder; a piston slidably received in the engine cylinder; and a device, carried by the piston, for measuring deformations in the cylinder wall. The piston has at least two radial bores. The measuring device includes a separate carrier element disposed in each radial bore. The carrier elements are attached to the piston in a region of the piston axis such as to be displaceable relative to the radial bores, whereby a relative motion between the piston and each carrier element is provided upon radial expansion and contraction of the piston. The measuring device further includes a separate, electrically inductive path sensor, which is electrically connectable to a measuring and evaluating device, and which is attached to a respective carrier element such that the path sensor remains out of contact with the cylinder wall at all times during movement of the piston relative to the engine cylinder.

Abstract: A measuring apparatus checks crankshafts 6 and has a rotatable workpiece holder (4, 5), a first group of bifurcated measuring devices (12a, 12b, 12c, 12d) for measuring the main bearings of the crankshaft and a second group of bifurcated measuring devices (19a, 19b) for measuring the connecting-rod bearings. Each bifurcated measuring device of the second group has several measuring sensors and its own drives for moving the bifurcated measuring device in the plane perpendicular to the axis of the crankshaft. When the crankshaft 6 is rotated, each bifurcated measuring device of the second group is either controlled on desired paths in accordance with the stroke of the connecting-rod bearing or is following up the movement of the connecting-rod bearing according to the signals of the measuring sensors.

Abstract: Checking apparatus comprising a support (1); sensing means (19; 71) adapted to provide signals depending on the features of the checked parts (3) with reference means (41, 42; 70) adapted to cooperate with the parts; and connection means (30; 66; 93) with resiliently deformable portions (34, 35; 69, 69' . . . ; 94, 94', . . . ) for connecting the sensing means to the support and enabling the reference means to properly cooperate with the parts through substantially rotary displacements about parallel geometric axes. In order to diminish the influence of plays and frictions and enable checkings--possibly combined checkings--featuring high accuracy and repeatability, the connection means comprise an element (30; 66; 93) having two legs (31, 33; 67, 68; 93), the element being substantially rigid, apart from a plurality of integral zones having reduced thickness, that define said resiliently deformable portions.

Abstract: A reference master part for linear dimensions and/or geometrical and/or shape features of determined workpieces (30) comprises precision-machined surfaces having mutual spatial arrangements such as to provide known references for said dimensions, etc. For simplifying the manufacturing processes and reducing the costs, the master part is made of a support body (1; 31) of ordinary material, reference elements (7, 8; 41-46, 50, 51, 54-57, 63, 64, 70, 71), of special material for master parts, fixed in corresponding seats (4; 33-38, 58-60) of the support body, and supporting and guiding elements (63, 64, 70, 71), made of special material, fixed to the support body. During the master part manufacturing, the reference elements are adjusted and then fixed in the relevant seats.

Abstract: A tool for use in checking and filing the end gap of piston rings. The tool includes a cylindrical member having a shoulder adjacent one end thereof which will receive and seat a piston ring and position it at a predetermined depth below the deck of a bore in order to determine the end gap between the adjacent ends of a piston ring with the shoulder on the tool providing for accurate position of the piston ring at a given depth throughout the 360.degree. circle of the piston ring. The tool includes a groove or channel formed therein by which the end gap can be filed to increase the end gap to the desired dimension. The tool enables the ring to be positioned in the cylinder and the end gap measured and the tool then is used to hold the ring when filing the ends. The slot or groove in the tool provides a guide for the file when filing the end gap.

Abstract: A relatively simple device for measuring such variables as piston wrist pin and connecting rod big end clearances in internal combustion engines includes a cylindrical casing with a threaded front end for mounting in a spark plug hole; an elongated, arcuate wire probe slidable in a sleeve on such front end for engaging the top end of a piston; a plunger slidably mounted in the casing and extending beyond the other end of the casing to a micrometer for measuring piston movement; and air and oil lines extending through the casing to such front end for introducing a vacuum, air or oil to the cylinder for various measuring procedures.