JPH05156980A - Engine crank angle detector - Google Patents

Abstract

PURPOSE:To provide a setting structure that is able to use a crank angle detecting sensor in common with various engines. CONSTITUTION:A projection 16 as a detected part is installed on the circumference of a belt guide 15 of a timing pulley 8 fixed to a crankshaft 1, and a sensor 5 directed to this projection 5 is positioned and fixed to a recess 18 formed in an oil pan 11. Since a crankcase is not worked and kept intact, this sensor is installable irrespective of engine form, thus it enjoys universality in terms of application.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine crank angle detecting device applied to an automobile engine.

[0002]

2. Description of the Related Art Many four-cycle engines are used in automobiles, and when adjusting the ignition timing and the fuel injection timing, the angular position of the crankshaft is checked. In an electronically controlled automobile, these operations are performed by using a crank angle detection sensor to accurately control the ignition timing and the fuel injection timing.

To detect the crank angle, as shown in FIG. 4, a counterweight 2 provided on a crankshaft 1 is provided with a protrusion 3 for detecting the crank angle, and a crankcase 4 is provided.
The crank angle is detected by the sensor 5 attached to the. Further, as shown in FIGS. 5 and 6, there is also a structure in which a detection plate (gear or the like) 6 is attached to the crankshaft 1 and the sensor 5 is mounted so as to face the detection plate 6.
Further, as shown in FIG. 7 and FIG. 8, the flywheel ring gear 7 is fixed to the crankshaft 1, and this is attached to the sensor 5
Some are detected by.

As described above, the crankshaft 1 provided with the detection plate 6 is an actual flat plate 1-99977.
It is also disclosed in Japanese Utility Model Publication No. 2-92066. In addition, there is a cam timing pulley provided with a protrusion and a sensor provided inside a timing belt (see Japanese Patent Laid-Open No. 60-78585).

It has also been proposed to mount a sensor on the inside surrounded by the timing belt hung on the crank pulley and on the outside of the crankcase (actually, KAIhei 2-94374).
(See Japanese Utility Model Publication No. 3-17285).

[0006]

However, when the detection plate 6 is attached to the crankshaft 1, the crank rotation radius becomes large, and the crankshaft 1 has a large radius.
Since the total length of the engine becomes longer, the engine becomes larger and is constrained by the design. Further, when the sensor 5 is provided in the crankcase 4, metal powder such as iron powder is likely to come out, so that the detection accuracy of the sensor is deteriorated.
However, there is a problem that it is necessary to examine the sensor mounting position, etc. for each engine. Further, since the ring gear 7 is used as a detection plate, there is a large restriction on the tooth profile for detection, and it is difficult to share parts at the sensor mounting part because the engine is for AT vehicles and MT vehicles. The work of mounting the sensor on each engine is complicated.

An object of the present invention is to provide an engine crank angle detecting device in which a sensor can be mounted commonly to each engine.

[0008]

In order to achieve the above object, the present invention provides a sensor for detecting an object to be detected on the circumference of a belt guide inside a pulley fixed to a crankshaft. Is arranged in a recess formed in the oil pan below the belt guide and screwed.

[0009]

With the above-described structure of the present invention, when the crankshaft rotates, the pulley rotates, and the object to be detected provided on the belt guide crosses the front of the sensor mounted on the oil pan. Can be detected.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 and 3, a timing pulley 8 is attached to a crankshaft 1 extending from a crankcase 4 of an engine, and a timing belt 9 is wound around the timing pulley 8. Screw the oil pump case 10 and the oil pan 11
A sensor 5 for detecting a crank angle projects from a hole 13 which is tightened by 12 and which is opened in alignment with the oil pump case 10 and the oil pan 11. The holes 13 may have a groove shape.

The sensor 5 for detecting the crank angle is located inside the belt cover 14 and is directed toward the belt guide 15 inside the timing pulley 8. Four protrusions 16 as an object to be detected formed on the circumference of the inner belt guide 15 have a fixed positional relationship with the crank angle, and the belt guide 15 is used as a crank angle detecting plate. A crank pulley 17 is provided so as to be connected to the timing pulley 8.

As shown in FIG. 2, the sensor 5 projects downward from a hole 13 formed in the oil pump case 10 and the oil pan 11, is accommodated in a recess 18 formed in the oil pan 11, and is oiled via a bracket 19. It is fixed by bolts 12 that tighten the pan 11.

Therefore, in order to detect the crank angle and perform the electronic control, first, the belt guide 15 inside the timing pulley 8 having the belt guide 15 formed inside is provided.
A protrusion 16 is provided on the. Next, the mounting space for the sensor 5 installed toward the inner belt guide 15 should be
A concave portion 18 is formed in 11 and a hole 13 is formed in that portion to secure the concave portion 18, and the sensor 5 is fixed to the oil pan 11.

Since the crank angle can be detected by the above mounting work and the crankcase of the engine does not have to be processed, the total length of the engine does not change, which is advantageous in design and easy to mount on various engines. Is. Further, since the sensor 5 is inside the belt cover 14 and iron powder or the like is hard to come out, the crank angle detection accuracy is good. Since the sensor 5 is attached together with the oil pan 11, the number of bolts can be reduced. The sensor 5 may be a magnetic sensor, or may be an optical sensor and the object to be detected may be changed to a transmission hole (or a reflection type).

[0015]

Since the present invention is configured as described above, since the belt guide is used for the crank angle detection plate, it does not require a dedicated detection plate and affects the size such as the total length of the engine. Also, the belt guide used as a detection plate is
Since the number of cylinders is almost the same, it can be applied to various engines. Further, since the sensor is fixed to the oil pan, it can be mounted on various engines without affecting the size of the crankcase or the like. Therefore, the crank angle can be detected by mounting the sensor according to the present invention on various engines.
In addition, the cost can be reduced because it can be shared by various engines.

[Brief description of drawings]

FIG. 1 is a front view of a main part of an engine according to an embodiment of the present invention.

FIG. 2 is a rear view of the embodiment in the direction of arrow A in FIG.

FIG. 3 is a cross-sectional view taken along line BB in FIG. 1 of the embodiment.

FIG. 4 is a sectional view of a crankcase showing a conventional crankshaft angle detection device.

FIG. 5 is a side view of a crankshaft showing a conventional crankshaft angle detection device.

FIG. 6 is a front view of the detection plate used in FIG.

FIG. 7 is a side view of a conventional flywheel ring gear connected to a crankshaft.

8 is a front view of the flywheel ring gear shown in FIG. 7. FIG.

[Explanation of symbols]

 1 Crankshaft 5 Sensor 8 Pulley 11 Oil pan 15 Belt guide 16 Protrusion 18 Recess

Claims (1)

[Claims] 1. A detection unit is provided on the circumference of a belt guide inside a pulley fixed to a crankshaft, and a sensor for detecting the detection unit is provided in a recess formed in an oil pan below the belt guide. A crank angle detecting device for an engine, which is arranged and screwed.