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KR-20260063884-A - CRANKSHAFT DEFLECTION MEASURING DEVICE

KR20260063884AKR 20260063884 AKR20260063884 AKR 20260063884AKR-20260063884-A

Abstract

A crankshaft deflection measuring device according to one embodiment of the present invention comprises a case forming an internal space, a shaft provided penetrating one side of the case and moving in the longitudinal direction according to a change in the distance between crank throws, a limiting block connected to one end of the shaft and protruding into the internal space, and a universal dial gauge accommodated in the internal space and measuring the longitudinal displacement of the shaft, wherein the limiting block is configured such that the movable distance of the shaft is limited to within the maximum measurable distance of the universal dial gauge.

Inventors

  • 전영민
  • 박규태

Assignees

  • 에이치디한국조선해양 주식회사
  • 에이치디현대중공업 주식회사

Dates

Publication Date
20260507
Application Date
20241031

Claims (6)

  1. A case forming an internal space; A shaft provided penetrating one side of the above case and moving in the longitudinal direction according to the change in distance between crank throws; A limiting block connected to one end of the shaft and protruding into the internal space; and It includes a universal dial gauge that is housed in the internal space and measures the longitudinal displacement of the shaft, The above limiting block is configured such that the movable distance of the shaft is limited to within the maximum measurable distance of the universal dial gauge, Crankshaft deflection measuring device.
  2. In paragraph 1, It further includes a length-adjustable fixing part provided on the other side facing one side of the above case, protruding outwardly, and The other end of the shaft and the one end of the fixed part each protrude outwardly and contact the inner wall surface of the crank throw. Crankshaft deflection measuring device.
  3. In paragraph 1, The above universal dial gauge is, A measuring part that contacts one end of the shaft and moves in the longitudinal direction according to the movement of the shaft; and A gauge head for measuring the travel distance of the above-mentioned measuring unit, Crankshaft deflection measuring device.
  4. In paragraph 3, A spring further comprising a spring that is penetrated by the measuring part and contacts one end of the shaft and is compressed according to the movement of the shaft. Crankshaft deflection measuring device.
  5. In paragraph 4, The crankshaft deflection measuring device is elastically supported between the crank throws by the spring, Crankshaft deflection measuring device.
  6. A crankshaft deflection measuring device comprising: a case including an internal space; a shaft provided penetrating one side of the case and moving longitudinally according to displacement between crank throws; a limiting block connected to an inner end of the shaft and protruding into the internal space; and a universal dial gauge accommodated in the internal space and measuring longitudinal displacement of the shaft. A communication unit that receives measurement information from the above-mentioned universal dial gauge and wirelessly transmits the measurement information to an external terminal; and It further includes a battery unit that supplies power to the above-mentioned universal dial gauge and the above-mentioned communication unit, and The above limiting block is configured such that the movable distance of the shaft is limited to within the maximum measurable distance of the universal dial gauge, Crankshaft deflection measurement system.

Description

Crankshaft Deflection Measuring Device The present invention relates to a crankshaft deflection measuring device. Typically, marine diesel engines consist of cylinders, pistons, crankshafts, etc. In particular, the crankshaft is assembled to the bed plate together with the main bearing shell and serves to convert the vertical movement of the piston into rotational movement by connecting it to the connecting rod. A chain wheel and a turning wheel are assembled on the stern side of the crankshaft to transmit the crankshaft's rotational motion to the camshaft and to slowly rotate the crankshaft during engine maintenance. Additionally, there is a thrust collar that, along with the thrust bearing, generates the ship's propulsion. Figure 1 shows a crankshaft commonly used in ships. Referring to FIG. 1, the crank shaft (1) may include a crank throw (2), and the crank throw may include two adjacent webs (3). While the crank shaft (1) is rotating, the distance between the inner wall of the crank throw (2), that is, two adjacent webs (3), may change due to factors such as thermal deformation and machining degree, and thus deflection may occur. When such deflection is large, vibration occurs and, in severe cases, it can cause failure, so it is necessary to measure the deflection and correct the engine assembly condition if it exceeds the normal error range. Previously, crank shaft deflection was measured using a dedicated dial gauge; however, since these dedicated dial gauges are limited to products from specific manufacturers, there is a problem with supply difficulties when they are discontinued. Accordingly, there has recently been an increasing demand to measure crankshaft deflection using universal dial gauges, but there is a problem with the difficulty of fixing universal dial gauges inside the crank throw. Figure 1 shows a crankshaft commonly used in ships. FIG. 2 illustrates a crankshaft deflection measuring system according to one embodiment of the present disclosure. FIG. 3 shows a front view of a crankshaft deflection measuring device according to one embodiment of the present disclosure. FIG. 4 shows a perspective view of a crankshaft deflection measuring device according to one embodiment of the present disclosure. FIG. 5 shows a side view of another crankshaft deflection measuring device according to one embodiment of the present disclosure. FIG. 6 shows a side cross-sectional view of a crankshaft deflection measuring device according to one embodiment of the present disclosure. The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the invention to specific embodiments, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and/or" includes a combination of a plurality of related described items or any of a plurality of related described items. Terms such as "~part," "~section," "~part," etc. may be used to describe various components, but said components should not be limited by said terms. These terms may refer not only to physically or visibly distinguishable components but also to descriptions of the function or configuration of a relevant part, even if the distinction or division is not clearly defined. The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to specify the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application. In the description belo