RU2260784C2 - Device to record crankshaft speed and tdc of piston of internal combustion engine - Google Patents

Abstract

FIELD: mechanical engineering; internal combustion engines.

SUBSTANCE: proposed device to record crankshaft speed and tdc of piston of internal combustion engine has inductive pickup and extension counterweight. Counterweight is provided with alternating projections-ribs and cavities, thus forming regular relief with interruption in form continuity.

EFFECT: simplified design, improved reliability of operation of device.

4 dwg

Description

The invention relates to the field of engine building and can be used in the production of internal combustion engines having a crankshaft with a removable removable counterweight.

A known internal combustion engine equipped with a crankshaft speed registration device consisting of a crankshaft position sensor mounted on the cover of an oil pump and a drive disk combined with a generator drive pulley and representing a gear wheel with teeth located on its periphery (see “VAZ-2111 engine control system (1.5 liter. 8 cells) with distributed fuel injection (M1.5.4N and January-5.1 controllers)”, St. Petersburg, PeterGrand, 2001, p. 10, Fig. 1.1- 17).

The disadvantage of this solution is the location of the magnetic circuit of the crankshaft position sensor outside the engine in a dirty, weather-protected area and, accordingly, the possibility of its failure due to contamination or damage. In addition, it is necessary to firmly position the generator drive pulley together with the gear relative to the crankshaft crank to ensure that the sensor records the top dead center of the piston position by using fixing elements (pin or key), which complicates and increases the cost of the design.

Also known is an internal combustion engine equipped with a device for recording the rotational speed of the crankshaft and TDC, consisting of a position sensor for the crankshaft and TDC installed in the engine block and working in conjunction with a ring having equally spaced grooves on its periphery, mounted on the crankshaft and oriented relative to its crank (see MTZ Motortechnische Zeitschrift No. 3 (1993), p. 115, Fig. 7 and MTZ Motortechnische Zeitschrift No. 4 (1994), page 200, Fig. 2 and 3).

A design flaw is an increase in the nomenclature of engine parts and a complication of the technology for manufacturing the crankshaft due to the need to refine its elements for mounting and ring orientation.

The closest set of essential features to the claimed technical solution is a device for recording the speed of the crankshaft and TDC, consisting of a position sensor for the crankshaft and TDC installed in the flywheel housing and working from special fins made on the flywheel. engine (see J.Kazedorf, E. Voisetschläger “Injection systems of foreign cars. Device, adjustment, repair” Translated from German. M: Publishing House “Behind the Wheel”, 2000, pp. 100, 101, fig. .8.1).

A disadvantage of the design of this solution is the location of the sensor in the dirty zone, which does not exclude the possibility of its failure due to contamination of the gear connection of the starter gear wheel – flywheel gear rim with ferromagnetic products of wear.

Problem to be solved: simplification of the design and improving the reliability of the device for recording the speed of the crankshaft and TDC of an internal combustion engine.

The problem is solved due to the fact that in the device for recording the rotational speed of the crankshaft and TDC, containing an induction sensor, an external counterweight, alternating protrusions-ribs and depressions are made on the periphery of the latter with the formation of a regular relief having an interruption in the form of continuity.

Analysis of known technical solutions for scientific, technical and patent documentation showed that the set of essential features of the proposed solution was not previously known, therefore, it meets the condition of "novelty."

The claimed technical solution is not obvious to qualified specialists in this field, as it resolved the following technical contradiction:

- on the one hand, for the operation of the sensor for detecting crankshaft speed and TDC, a response relief in the form of depressions or ridges-ribs is required, which rotates at the same angular velocity with the crankshaft and is oriented relative to the crank of the crankshaft, and the sensor operating zone with this relief should be protected from external atmospheric influences;

- on the other hand, the introduction of elements of a system for recording the speed of the crankshaft into the engine should not complicate the manufacturing technology of basic engine parts and increase the range of used parts.

Performing on the periphery of the external counterweight of the crankshaft alternating protrusions-ribs and depressions with the formation of a regular relief having a discontinuity in the form of continuity, made it possible, without increasing the range of components used and without complicating the manufacturing technology of the crankshaft, to establish a system for recording revolutions of the crankshaft and TDC in the internal engine combustion, while the zone of operation of the sensor is in the internal space of the engine, reliably protected from external influences, which allowed the above th contradiction. Thus, the claimed technical solution meets the criterion of "inventive step".

The claimed technical solution is illustrated by drawings, where:

figure 1 - installation of the counterweight on the end of the crankshaft;

figure 2 is a General view of a device for recording the frequency of rotation of the crankshaft and TDC of an internal combustion engine;

figure 3 - view a in figure 2;

4 is a General view of the counterweight.

The device comprises an induction sensor 1 and an external counterweight 2. On the periphery of the external counterweight 2, alternating protrusions-ribs 3 and depressions 4 are made with the formation of a regular relief.

The induction sensor 1 is hermetically installed in the crankcase 5 of the engine block using a rubber ring 6 and secured with a screw 7.

The external counterweight 2 is pressed onto the end of the crankshaft 8 and oriented relative to its crank pin 9 by a key 10.

To mark TDC, an interruption of 11 regular reliefs was performed in the form of a continuity, which is a protrusion or depression with a duration of 2 ... 3 steps of a regular relief.

The registration of the crankshaft revolutions occurs by processing the signal from the induction sensor 1, which responds to changes in the characteristics of the magnetic field associated with the passage of the protrusions-ribs 3 and depressions 4 of the regular relief past the core of the sensor 1.

The registration of TDC occurs at the moment of passing by the sensor 1 interrupt 11 of the regular terrain.

The claimed technical solution meets the requirement of industrial applicability and is possible for implementation on standard technological equipment using modern technologies.

Claims (1)

A device for recording the rotational speed of the crankshaft and the top dead center of the piston (TDC) of the internal combustion engine, comprising an induction sensor, an external counterweight, characterized in that alternating protrusions-ribs and depressions are made on the external counterweight with the formation of a regular relief having an interruption in the form of a continuity .

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