JP5662635B2 - Rotation position detection plate and crankshaft rotation position detection apparatus using the same - Google Patents

Description

  The present invention relates to a rotational position detecting plate and a rotational position detecting device for a crankshaft using the same.

Conventionally, as this type of rotational position detection plate, for example, as disclosed in Patent Document 1, it is attached to a crankshaft to detect the rotational position of the crankshaft of an internal combustion engine, and is formed on an outer peripheral surface. A signal plate for detecting a tooth portion by a rotation sensor has been proposed.
The signal plate includes a protruding portion that protrudes radially outward from the tooth portion on the outer peripheral surface, and can prevent deformation of the tooth portion by hitting the protruding portion to the outside before the tooth portion when the internal combustion engine is assembled. It is supposed to be.
JP 2000-120465 A

By the way, when the signal plate described above is attached to the crankshaft, vibration is generated with the rotation of the crankshaft, and the tooth portion formed on the outer peripheral surface is shaken, which may reduce the detection accuracy of the rotational position.
In the above-described signal plate, it is possible to prevent a decrease in the detection accuracy of the rotational position due to the deformation of the tooth portion during assembly, but no mention is made of such a decrease in the detection accuracy of the rotational position due to the shake of the signal plate.
Although it is sufficient to increase the bending rigidity by increasing the thickness of the signal plate, there is a problem that the weight increases.

The rotational position detection plate of the present invention aims to easily secure a structure that improves rigidity while suppressing an increase in weight, and the following means are adopted to achieve at least a part of this object.
The rotational position detection plate of the present invention includes a main body including an attachment portion to the rotating body, and a detection portion for detecting the rotational position of the rotating body, and is a rotational position attached to the rotating body. A detection plate,
The main body portion has a rotating body side surface that becomes the rotating body side when attached to the rotating body and / or an opposite side surface opposite to the rotating body side surface with a curved surface from the periphery of the mounting portion toward the outer peripheral edge portion. together are formed comprising a Jo, the outer peripheral edge portion is being bent continuously from the portion formed the bowl shape so as to be parallel to the axial direction of the rotating body,
The bending angle of the outer peripheral edge is formed as an obtuse angle,
The gist of the present invention is that the detection unit is a plurality of teeth that are intermittently formed at the tip of the outer peripheral edge of the main body.

In the rotational position detection plate of the present invention, at least one of the rotating body side which is the rotating body side of the main body including the mounting portion to the rotating body and the opposite side surface which is the opposite side of the rotating body side surface is provided. Since it is formed in a bowl shape with a curved surface from the periphery of the mounting portion toward the outer peripheral edge , the bending rigidity is improved. That is, even if vibration occurs with the rotation of the rotating body, plate shake can be suppressed. In addition, since the main body portion is simply formed in a bowl shape with a curved surface from the periphery of the attachment portion toward the outer peripheral edge portion, it is possible to easily ensure a structure that improves rigidity while suppressing an increase in weight. In addition, the outer peripheral edge of the main body where stress is concentrated most due to the vibration of the rotational position detection plate is continuously bent from the hook-shaped portion, and the tooth is formed at the tip, so the main body is bent. The strength can be ensured as compared with the case where the outer peripheral edge is not provided. Moreover, since the main body portion is formed in a bowl shape from the periphery of the mounting portion toward the outer peripheral edge portion, it can be continuously bent from the portion formed in the hook shape so that the bending angle of the outer peripheral edge portion can be obtuse, Strength can be secured. In addition, when the outer peripheral edge portion is bent, the stress generated in the bent portion can be relieved by continuously bending the portion formed in a bowl shape, thereby improving the productivity and improving the strength. .

In the rotational position detection plate according to the present invention, the main body portion may be formed in a spherical shell shape.
In this way, since the main body is only formed in a spherical shell shape, a structure with improved rigidity can be easily secured.

In the rotational position detection plate according to the present invention, the main body portion may be formed in a conical shell shape.
In this way, since the main body is only formed in a conical shell shape, a structure with improved rigidity can be easily secured.

A crankshaft rotational position detection device according to the present invention is a crankshaft rotational position detection device that detects a rotational position of a crankshaft as the rotating body, and the crankshaft is in any one of the above-described aspects. The gist of the present invention is that the mounting seat surface to which the rotational position detection plate of the present invention is attached is formed in a shape corresponding to the shape of the mounting portion of the rotational position detection plate.
If it carries out like this, a rotation position detection plate can be stably attached and fixed to a crankshaft.

  Next, the best mode for carrying out the present invention will be described using examples.

FIG. 1 is a longitudinal sectional configuration diagram of the crankshaft 5 attached to the cylinder block 1, and FIG. 2 is an enlarged sectional view of the engine tail portion of the crankshaft 5.
The cylinder block 1 of the internal combustion engine is partitioned through bore walls 2, 2, and 2, respectively, and in order from the front side to the rear side, the first cylinder bore 1 a, the second cylinder bore 1 b, and the third cylinder bore 1 c, 4 No. cylinder bore 1d is formed, and a substantially semicircular bearing portion 2b is formed on the lower end side of each bore wall 2, and a crankshaft 5 is connected to the bearing portion 2b via a bearing member 3. It is supported so that it can rotate. The bearing cap 4 is fitted into the lower end of each bearing portion 2b from below.

The crankshaft 5 corresponds to the four cylinder bores 1a, 1b, 1c, 1d, and corresponds to the four crank pins 6a, 6b, 6c, 6d, between the cylinder bores 1a, 1b, 1c, 1d and to the cylinder ends. The five journals 7a, 7b, 7c, 7d, and 7e are alternately provided.
The crankshaft 5 is rotatably supported with respect to the cylinder block by supporting journals 7a, 7b, 7c, 7d and 7e between the bearing portion 2b and the bearing cap 4 through the bearing member 3. Therefore, the journals 7 a, 7 b, 7 c, 7 d, 7 e are arranged on the central axis of the crankshaft 5. On the other hand, the crank pins 6 a, 6 b, 6 c, 6 d are connected to a piston that receives combustion pressure via a connecting rod and a piston pin (not shown), and are arranged eccentric from the central axis of the crank shaft 5. A flange 8 to which a flywheel (not shown) is attached is provided at the rear end of the crankshaft 5.

The crank pins 6a, 6b, 6c, 6d and the journals 7a, 7b, 7c, 7d, 7e are connected by a total of eight crank arms 9, and each cylinder bore 1a, 1b, 1c, 1d is connected to the crank arm 9. The counterweight 10 is integrally formed correspondingly. The counterweight 10 is disposed on the opposite side to the crankpins 6a, 6b, 6c, 6d with respect to the central axis of the crankshaft 5 in order to balance the weight.
Further, as shown in FIG. 2, the crankshaft 5 is mounted for mounting a signal plate 11 (to be described later) on the side of the crank arm 9 and counterweight 10 on the rear side of the engine corresponding to the fourth cylinder bore 1d at the rear of the engine. The seat surfaces 9a and 10a are formed with steps by the step portions 9b and 10b. Here, the mounting seat surfaces 9a and 10a are formed in a shape corresponding to the shape of the mounting surface 14 of the signal plate 11 described in detail later.

3 is an enlarged sectional view taken along the line XX of FIG. 2, and FIG. 4 is an enlarged perspective view of the signal plate 11.
As shown in FIGS. 3 and 4, the signal plate 11 has an annular plate shape in which a journal 7e and a flange 8 at the rear end of the engine of the crankshaft 5 are penetrated and a central hole 13a that can be inserted is formed in the central portion. The main body portion 13 and a plurality of tooth portions 16 intermittently formed on an outer peripheral edge portion 15 formed by bending the outer peripheral portion of the main pair portion 13. The surface on which the side is formed is brought into contact with the mounting seat surfaces 9 a and 10 a and is fixed to the crankshaft 5 by the fixing bolt 17.
As shown in FIG. 4, the main body 13 is formed in a spherical shell shape in which the surface facing the tooth portion 16, that is, the surface facing the mounting seat surfaces 9 a and 10 a of the crankshaft 5 is a concave spherical surface. ing. The main body 13 forms a mounting surface 14 at positions corresponding to the mounting seat surfaces 9 a and 10 a of the crankshaft 5. The main body 13 is formed with three bolt holes 13b through which the fixing bolts 17 are inserted and a plurality of lightweight holes 13c for weight reduction.

FIG. 5 is an enlarged cross-sectional view showing an enlarged cross section near the outer peripheral edge 15 of the signal plate 11.
The outer peripheral edge 15 is formed by bending the outer peripheral tip of the main body 13 formed in a spherical shell shape so as to be parallel to the central axis of the crankshaft 5. Therefore, the bending angle α of the outer peripheral edge 15 is an obtuse angle as shown in FIG. Thereby, when the outer peripheral edge portion 15 is formed by bending, the stress generated in the bent portion can be relaxed. As a result, productivity can be improved and strength can be improved.

The crank angle sensor 12 is configured as a known magnetic sensor that detects an angle of rotation of the crankshaft 5 by taking out an electric signal based on a voltage from a magnetic field change by the tooth portion 16 of the signal plate 11.
The crank angle sensor 12 is set to detect the rotation angle of the crankshaft 5 on the basis of the top dead center, and the ignition timing and fuel injection timing of the internal combustion engine are determined based on the detected rotation angle of the crankshaft 5. Is done.

In the signal plate 1 of the embodiment configured in this way, the bending rigidity is improved as compared with the case where the main body portion 13 is configured as a simple plane. Therefore, even if vibration is input via the crankshaft 5, the signal plate 11 itself can be satisfactorily suppressed. As a result, it is possible to suppress a decrease in detection accuracy of the rotational position. And since the main-body part 13 is only formed in a spherical shell shape, the structure which improves the bending rigidity of the signal plate 11 can be ensured simply, suppressing an increase in weight.
Further, by forming the main body portion 13 in a spherical shell shape, the bending angle of the outer peripheral edge portion 15 can be obtuse, so that the stress generated in the bent portion can be relaxed. As a result, productivity can be improved and strength can be improved.

Next, FIGS. 6 and 7 show a second embodiment.
In the signal plate 11 of the second embodiment, as shown in FIGS. 6 and 7, the signal plate 11 of the second embodiment faces the surface on which the tooth portion 16 faces, that is, the mounting seat surfaces 9 a and 10 a of the crankshaft 5. The structure is the same as that of the signal plate 11 of the first embodiment except that the side surface is formed in a conical shell shape having a concave conical surface.
The mounting seat surfaces 9 a and 10 a are formed with conical curved surfaces corresponding to the mounting surface 14 of the signal plate 1.

Also in this example, since the bending rigidity is improved as compared with the case where the main body portion 13 is configured by a simple plane, even if vibration is input through the crankshaft 5, the signal plate 11 itself can be shaken well. Can be suppressed. As a result, it is possible to suppress a decrease in detection accuracy of the rotational position. And since the main-body part 13 is only formed in conical shell shape, the structure which improves the bending rigidity of the signal plate 11 can be ensured simply, suppressing an increase in weight.
Further, by forming the main body portion 13 in a conical shell shape, the bending angle of the outer peripheral edge portion 15 can be obtuse, so that the stress generated in the bent portion can be relaxed. As a result, productivity can be improved and strength can be improved.

  In each of the above-described embodiments, the surface of the crankshaft 5 that faces the mounting seat surfaces 9a and 10a is formed as a concave spherical surface or a concave conical surface. Any shape can be used as long as it can be formed into a bowl shape.

  In each of the embodiments described above, the mounting surface 14 of the signal plate 11 is also formed as a concave spherical surface or a concave conical surface, but the mounting surface 14 is formed in a plane perpendicular to the axis of the crankshaft 5. It is also good. At this time, the seating surface portions with which the mounting seating surfaces 9a and 10a and the heads of the fixing bolts 17 of the signal plate 11 abut may be similarly formed on a plane perpendicular to the axis of the crankshaft 5. In this way, the signal plate 11 can be stably attached and fixed to the attachment seat surfaces 9a and 10a. Further, the mounting seat surfaces 9a and 10a can be easily processed.

  In each of the above-described embodiments, the main body portion 13 is formed in a spherical shell shape or a conical shell shape, that is, the surface on the side facing the mounting seat surfaces 9a and 10a of the crankshaft 5 is formed in a concave spherical surface or a conical surface. At the same time, the surface opposite to the side facing the mounting seat surfaces 9a and 10a is also formed into a protruding spherical surface or conical surface corresponding to the shape of the surface facing the mounting seat surfaces 9a and 10a. However, as shown in the modification of FIG. 8, the main body 13 may be formed such that only the surface facing the mounting seat surfaces 9a and 10a is a concave spherical surface or a conical surface. Even in this case, since the bending rigidity is improved as compared with the case where the main body portion 13 is configured by a simple plane, even if vibration is input via the crankshaft 5, the vibration of the signal plate 11 itself is well suppressed. Therefore, it is possible to suppress a decrease in detection accuracy of the rotational position.

  In each of the above-described embodiments and modifications thereof, the main body 13 is formed with a concave spherical surface or conical surface on the side facing the mounting seat surfaces 9a and 10a of the crankshaft 5, but the bending rigidity is improved. For example, as shown in the modification of FIG. 9, the main body 13 has a concave spherical surface or conical surface only on the surface opposite to the surface facing the mounting seat surfaces 9 a and 10 a of the crankshaft 5. Or a concave spherical surface or a conical surface on both the surface facing the mounting seat surfaces 9a and 10a and the surface opposite to the surface facing the mounting seat surfaces 9a and 10a. It does not matter.

It is a longitudinal cross-section block diagram which shows the attachment state to the cylinder block of a crankshaft. It is an enlarged view of the attachment state of the signal plate seen from the engine tail. It is an XX line cross-section enlarged view of the attachment state to the crankshaft of a signal plate. It is an expansion perspective view of a signal plate. It is a principal part expanded sectional view of a signal plate. It is an XX line expanded sectional view of the attachment state to the crankshaft of the signal plate of 2nd Example. It is an expansion perspective view of the signal plate of 2nd Example. It is the XX sectional enlarged view of the modification of the attachment state to the crankshaft of a signal plate. It is the XX sectional expanded view of the modification of the attachment state to the crankshaft of the further signal plate.

DESCRIPTION OF SYMBOLS 1 Cylinder block 1a, 1b, 1c, 1d, Cylinder bore 2 Bore wall 2b Bearing part 3 Bearing member 5 Crankshaft 6a, 6b, 6c, 6d Crank pin 7a, 7b, 7c, 7d, 7e Journal 8 Flywheel mounting flange 9 Crank arm 10 Counterweight 9a, 10a Mounting seat 9b, 10b Step 11 Signal plate (Rotation position detection plate)
12 Crank angle sensor (rotation angle detector)
13 Body part 13a Central hole 13b Bolt hole 13c Lightweight hole 14 Mounting part 15 Outer peripheral edge part 16 Teeth part

Claims (4)

A rotation position detection plate comprising a main body including an attachment portion to a rotating body, and a detection unit for detecting a rotation position of the rotating body, the rotation position detecting plate being attached to the rotating body,
The main body portion has a rotating body side surface that becomes the rotating body side when attached to the rotating body and / or an opposite side surface opposite to the rotating body side surface with a curved surface from the periphery of the mounting portion toward the outer peripheral edge portion. together are formed comprising a Jo, the outer peripheral edge portion is being bent continuously from the portion formed the bowl shape so as to be parallel to the axial direction of the rotating body,
The bending angle of the outer peripheral edge is formed as an obtuse angle,
The detection unit is a plurality of teeth that are intermittently formed at the tip of the outer peripheral edge of the main body.   The rotational position detection plate according to claim 1, wherein the main body is formed in a spherical shell shape.   The rotational position detection plate according to claim 1, wherein the main body is formed in a conical shell shape. A crankshaft rotation position detection device for detecting a rotation position of a crankshaft as the rotating body,
In the crankshaft, a mounting seat surface to which the rotational position detection plate according to any one of claims 1 to 3 is attached is formed in a shape corresponding to the shape of the attachment portion of the rotational position detection plate. Crankshaft rotation position detection device.

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