JPH11351008A - Rotation angle detecting device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arrange a detecting means for detecting a rotation angle adjacent to an identification body by providing the detecting means mounted to an engine structural body so that it is inserted into a through hole of a dermal body facing an identifying portion and is opposite to an identifying surface. SOLUTION: In a rotation angle detecting device 52, an identifying surface 56 of a sensing rotor 54 integrally provided for an intake side mounting portion 32 of an intake cam shaft 16 is provided with an identifying portion corresponding to a rotation angle of the intake cam shaft 16 so as to face a chain cover 50. A sensor 60 for identifying the identifying portion and detecting the rotation angle of the intake cam shaft 16 is mounted to a cylinder head 6 so that the sensor is inserted into a through hole of the chain cover 50 facing the sensing rotor 54 and is opposite to the identifying portion. Thus, because the identifying portion is provided using the identifying surface 56 orthogonal to an axis line of the intake cam shaft 16, the rotation angle can be detected by providing a slightly deep identifying portion in the sensing rotor 54 integrally provided for the intake side mounting portion 32, and variation of a distance between the sensor 60 and the identifying portion can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a rotation angle of an internal combustion engine, and more particularly, to avoiding an increase in the size of a rotary motion transmitter provided with a discriminator for detecting a rotation angle, and restricting the layout of detection means. Can be reduced, the vibration of the encapsulated body can be reduced, the position accuracy of the identification body with respect to the rotation axis can be improved,
The number of assembly steps can be reduced, the weight can be reduced, the cost can be reduced, the erroneous detection of the rotation angle can be prevented, and the reliability of control by the rotation angle can be improved. The present invention relates to a rotation angle detection device for an internal combustion engine that can be applied to a rotation angle detection device.

[0002]

2. Description of the Related Art Some internal combustion engines mounted on vehicles are provided with a rotation angle detecting device for detecting a rotation angle of a rotating shaft for discriminating a cylinder and identifying an engine speed. Examples of such a rotation angle detecting device include those shown in FIGS. In FIG. 23, 102 is an internal combustion engine,
Reference numeral 104 denotes a crankshaft serving as a rotating shaft, reference numeral 106 denotes a crank timing pulley serving as a rotating motion transmitting body, and reference numeral 108 denotes a rotation angle detecting device. The internal combustion engine 102 is provided with a timing belt pulley 106 around which a timing belt (not shown) as an endless rotational motion transmitting device is wound around one end in the axial direction of a crankshaft 104 which is supported by a cylinder block 110 as an engine component. Mounted and provided.

The rotation angle detecting device 108 includes a timing belt pulley 106 mounted on the crankshaft 104.
A sensing rotor 112 as a discriminating body for discriminating a rotation angle is provided so as to protrude from a side surface of the sensor. Sensing rotor 11
As shown in FIGS. 24 and 25, a projection 1 serving as an identification portion corresponding to the rotation angle of the crankshaft 104 is provided on the peripheral edge 114 as shown in FIGS.
16 is provided so as to protrude radially outward.

The rotation angle detecting device 108 includes a projection 116.
A sensor 118 is provided as detection means for detecting the rotation angle of the crankshaft 104 by identifying the rotation angle. The sensor 116 is
The sensing rotor 112 is provided on the peripheral edge 114 of the sensing rotor 112 so as to be directed to the center in the radial direction and positioned below the crankshaft 104 and attached to the cylinder block 110. The rotation angle detecting device 108 detects the projection 116 corresponding to the rotation angle by the sensor 118 and detects the crank angle as the rotation angle.

FIG. 26 shows a rotation angle detecting device.
-There is one shown in FIG. The rotation angle detecting device 208 shown in FIGS. 26 and 27 is provided with a sensing rotor 212 attached to an end of a cam shaft 204 serving as a rotating shaft. In the sensing rotor 212, a projection 216 corresponding to the rotation angle of the cam shaft 204 is provided on the peripheral edge 214 so as to protrude radially outward.

The rotation angle detection device 208 is provided with a sensor case 220 that covers the sensing rotor 212 attached to a cylinder head (not shown) that is an engine component. The sensor 218 for identifying the protrusion 216 and detecting the rotation angle of the cam shaft 204 is provided on the periphery 21 of the sensing rotor 212.
4 is attached to the sensor case 220 so as to be directed to the center in the radial direction and to be located on the side of the cam shaft 204. The rotation angle detection device 208 identifies the protrusion 216 corresponding to the rotation angle by the sensor 218 and detects the cam angle, which is the rotation angle.

Further, as a rotation angle detecting device, FIG.
8 is shown. Rotation angle detection device 3 shown in FIG.
08, a sensing rotor 312 is attached to a side surface of a timing belt pulley 306 serving as a rotational motion transmitting body attached to a shaft end of the cam shaft 304 serving as a rotating shaft by a mounting bolt 322, and the rotation of the cam shaft 304 is attached to a peripheral edge 314 of the sensing rotor 312. The protrusion 316 corresponding to the angle is provided so as to protrude in the radially outward direction.

[0008] The rotation angle detecting device 308 includes a projection 316.
3 for detecting the rotation angle of the camshaft 304 by identifying
18 are provided. The sensor 318 is directed to the radial center of the sensing rotor 312 and the camshaft 304
And attached to a cylinder head (not shown). The rotation angle detection device 308 is provided with the sensor 31
8, the projection 316 corresponding to the rotation angle is identified, and the cam angle, which is the rotation angle, is detected.

Japanese Patent Application Laid-Open Nos. 8-14814 and 8-14 disclose such a rotation angle detecting device for an internal combustion engine.
As disclosed in Japanese Patent No. 4799, there is a structure in which a sensing rotor and a sensor, which are identification bodies for identifying a rotation angle, are integrally incorporated into a case to constitute an assembly, and are assembled into an internal combustion engine.

Japanese Patent Application Laid-Open Nos. 8-121206 and 8-312 disclose a rotation angle detecting device for an internal combustion engine.
As disclosed in Japanese Unexamined Patent Publication No. 512 and Japanese Unexamined Patent Application Publication No. 9-280084, a sensor serving as a detecting means is mounted on a cylinder head or a head cover so as to be directed to a radial center of a sensing rotor serving as an identification body for identifying a rotation angle. There is something.

Further, as a rotation angle detecting device for an internal combustion engine, as disclosed in Japanese Patent Application Laid-Open No. Hei 5-180613, an identification portion corresponding to the rotation angle is provided on the inner surface of a rim portion of a cam pulley attached to a cam shaft. In some cases, a sensor serving as detecting means is attached to a head cover and directed to the inner surface of the rim portion provided with the identification portion.

Further, as a rotation angle detecting device of an internal combustion engine, as disclosed in Japanese Patent Application Laid-Open No. 8-135478, a timing belt pulley having a sensing rotor as a discriminator for discriminating the rotation angle press-fitted and fixed, As disclosed in Japanese Patent Application Laid-Open No. 9-88626, there is an apparatus in which a sensor serving as a detecting means is attached to a cam cap of a cam shaft so as to be directed to a projection corresponding to a rotation angle on the back surface of a cam pulley.

[0013]

However, FIG.
The conventional rotation angle detecting device shown in FIG. 28 is provided with a discriminator for discriminating a rotation angle on a side surface of a rotary motion transmitter attached to a rotary shaft, and detects the discrimination object by directing the periphery of the discriminator to a radial center. Means are provided.

For this reason, the rotary motion transmitting body provided with the discriminating body is increased in size and weight, and the axial length of the rotary shaft is increased, and the layout of the detecting means is limited. .

When the rotary motion transmitting member provided on the rotary shaft is a sprocket, the teeth provided on the peripheral edge of the sprocket are replaced with identification portions corresponding to the rotation angles provided on the peripheral edge of the rotary angle identification body. In order to prevent erroneous identification, it is necessary to provide an identification portion corresponding to the rotation angle with respect to the tooth portion of the sprocket.

Therefore, similarly to the above, the rotary motion transmitting body provided with the identification body causes an increase in the length of the rotary shaft in the axial direction and an increase in size and weight, thereby restricting the layout of the detecting means. Inconvenience.

Further, when a separate discriminator for discriminating the rotation angle is attached to the rotary motion transmitter attached to the rotary shaft, an error in the mounting position of the rotary motion transmitter with respect to the rotary shaft or the discriminator for the rotary motion transmitter is required. The mounting position errors overlap,
There is a problem that the position accuracy of the identification body for identifying the rotation angle with respect to the rotation axis is reduced.

For this reason, the discriminating section corresponding to the rotation angle provided on the discriminator causes a shift in the position of the rotation angle, causing the detecting means to erroneously detect the rotation angle, and controlling the rotation angle. There is an inconvenience that reduces reliability.

[0019]

SUMMARY OF THE INVENTION Therefore, in order to eliminate the above-mentioned disadvantages, the present invention provides an endless rotary motion transmitting device provided at one end in the axial direction of a rotary shaft supported by an engine structure of an internal combustion engine. A rotary motion transmitting body to be hung is provided, and an enclosing body is provided to cover the endless rotary motion transmitting tool and the rotary motion transmitting body and to be attached to the engine component, and an attaching portion of the rotary motion transmitting body to a rotary shaft is provided. An identification body for identifying the rotation angle is provided integrally with the identification body, and an identification portion corresponding to the rotation angle of the rotating shaft is provided on a side of the identification body facing the envelope, and the identification portion is identified and the rotation is performed. Detecting means for detecting the rotation angle of the shaft is provided, and the detecting means is attached to the engine structure so as to be inserted into an insertion hole of the envelope facing the identification body and to face the identification portion. It is characterized by.

[0020] The rotation angle detecting device may include an identification surface provided on a side of the identification body integrally provided on the mounting portion of the rotary motion transmitting body, the side facing the enclosing body. The identification unit is provided so as to face a detection unit.

[0021] The rotation angle detecting device is provided with an identification surface on a side of the identification body integrally provided on the mounting portion of the rotation motion transmitting body, the side facing the enclosing body, and the identification surface is provided in a circumferential direction of the identification surface. The identification portion is provided so as to be depressed so as to face the detection means, and the rotation angle detection device includes a mounting portion for the rotational motion transmitting body and the identification body provided integrally with the mounting portion. A discriminating surface is provided on a side of the discriminating body facing the envelope, and the discriminating portion is provided so as to face the detecting means in a circumferential direction of the discriminating face. A positioning notch that is directed in the axial direction of the rotating shaft and reaches the identification surface in the mounting hole that is located radially inward of the portion, and the notch is provided on the identification surface as one of the identification portions; To be located on the same diameter line as The rotation angle detecting device is provided with a mounting hole in a mounting portion of the rotary motion transmitting body and the identification body provided integrally with the mounting portion, and a side of the identification body facing the envelope. An identification surface is provided, and the identification portion is provided so as to be depressed so as to face the detection means in a circumferential direction of the identification surface, and the rotation shaft is provided in the mounting hole located radially inward of the identification portion. A notch for positioning that is directed in the axial direction and reaches the identification surface is provided, and the notch is provided so as to be located on the same radial line as one of the identification portions on the identification surface, and a circumferential direction of the identification surface is provided. Is provided so as to have the same width as that of the identification unit.

In the rotation angle detecting device, a mounting hole is provided in a mounting portion of the rotary motion transmitting body and the identification body integrally provided in the mounting portion, and a side of the identification body facing the enclosing body is provided. An identification surface is provided, and the identification portion is provided so as to be depressed so as to face the detection means along the mounting hole in the circumferential direction of the identification surface, and is directed in the mounting hole in the axial direction of the rotating shaft. And a notch for positioning reaching the identification surface is provided.
It is characterized by being provided so as to overlap with one another,
The rotation angle detecting device is provided with a mounting hole in a mounting portion of the rotary motion transmitting body and the identification body provided integrally with the mounting portion, and a recognition surface is provided on a side of the recognition body facing the envelope. The identification portion is provided so as to be depressed so as to face the detection means in the circumferential direction of the identification surface, and in the mounting hole located radially inward from the identification portion in the axial direction of the rotation shaft. A notch for positioning that is directed and reaches the identification surface is provided, and is extended from the mounting hole to a radially outermost end of the notch in the circumferential direction of the identification surface and is depressed to the same depth or more as the identification portion. The present invention is characterized in that an annular step portion is provided.

[0023] The rotation angle detecting device may have a plane shape that intersects the axis of the rotation shaft at right angles to the axis of the rotation shaft on a side of the identification body provided integrally with the mounting portion of the rotation motion transmission body, the side facing the enclosing body. An identification surface is provided, and the identification portion is provided so as to be depressed so as to face the detection means in a circumferential direction of the identification surface having a planar shape. A conical identification surface is provided on the side of the identification body provided integrally with the mounting portion, which faces the envelope, at an angle to and intersects with the axis of the rotating shaft. The identification portion is provided so as to be depressed so as to face the detection means in a direction.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotation angle detecting device for an internal combustion engine according to the present invention is provided with a discriminating body for discriminating a rotation angle at a mounting portion of a rotary motion transmitting body mounted at one end in the axial direction of a rotation shaft of the internal combustion engine. By providing the identification portion corresponding to the rotation angle of the rotating shaft on the side of the identification body facing the enclosing body, an increase in the size of the rotating motion transmitting body and an increase in the axial length of the rotating shaft are caused. In addition, a detecting means for identifying the identification unit and detecting the rotation angle of the rotating shaft is inserted into the insertion hole of the envelope facing the identification body and attached to the engine component so as to face the identification unit. Accordingly, the vibration of the envelope can be suppressed, the layout of the detection unit can be easily made, and the detection unit can be arranged close to the identification body.

The discriminating body is provided with a discriminating surface on a side of the discriminating body provided integrally with the mounting portion of the rotary motion transmitting body, which faces the enclosing body, and faces the detecting means in a circumferential direction of the discriminating face. By providing the identification section in the detection section, it is possible to arrange the detection means close to the identification body without increasing the size of the rotary motion transmitting body or increasing the axial length of the rotating shaft.

In the rotation angle detecting device, a mounting hole is provided in the mounting portion of the rotary motion transmitting body and the identification body provided integrally, and an identification surface is provided on a side of the identification body facing the envelope. ,
By providing the discriminating portion so as to face the detecting means in the circumferential direction of the discriminating surface, the mounting jig does not interfere with the discriminating portion when the rotary motion transmitting body is mounted on the rotating shaft, so that the discriminating portion can be easily formed. It can be installed, and the weight can be reduced.

In this case, the rotation angle detecting device is provided with a notch for positioning that is directed in the axial direction of the rotating shaft and reaches the identification surface in a mounting hole located radially inward of the identification portion, This notch is placed on the identification surface,
Since the signal for erroneously identifying the cutout portion as the identification portion by the detection means coincides with the signal of the normal identification of the identification portion, the rotation angle is erroneously detected by being provided so as to be positioned on the same radial direction line as the one. Nothing. The notch is provided on the identification surface so as to be located on the same radial line as one of the identification portions, and is provided so as to have the same width as the identification portion in the circumferential direction of the identification surface. Since the width of the signal that is erroneously identified as the identification unit can be made to match the width of the normal identification signal of the identification unit, erroneous detection of the rotation angle can be prevented more reliably.

The rotation angle detecting device is provided with a discriminating portion provided along a mounting hole in a circumferential direction of the discriminating surface so as to be positioned in the mounting hole in the axial direction of the rotating shaft and to reach the discriminating surface. The notch can be used as one of the identification portions by providing the notch portion so as to overlap with one of the identification portions on the identification surface, so that the identification portion can be reduced. The number of processing can be reduced,
Recognition of the notch by the detection means can be used as identification of a proper identification portion, and the rotation angle is not erroneously detected.

Further, the rotation angle detecting device is provided with a notch for positioning that is directed in the axial direction of the rotating shaft and reaches the identification surface in a mounting hole located radially inward of the identification portion. By providing an annular step that extends from the mounting hole in the circumferential direction to the radially outermost end of the notch and that is recessed to the same depth or more than the identification part, the part with and without the identification part on the identification surface is provided. Can be determined under the same condition, and erroneous recognition can be eliminated.

Further, the rotation angle detecting device is provided with a planar identification surface which intersects at right angles with the axis of the rotating shaft on the side of the identification body facing the enclosing body, and the circumferential direction of the identification surface of the planar shape is provided. By arranging the identification section so as to be opposed to the detection means, the layout of the detection means becomes easy,
It becomes possible to arrange the detecting means close to the discriminating body, and to provide a discriminating surface having a conical surface shape that inclines and intersects with the axis of the rotation axis on the side of the discriminating body facing the enclosing body. By providing the discriminating portion so as to be opposed to the detecting means in the circumferential direction of the surface-shaped discriminating surface, the protruding length of the detecting means from the envelope can be shortened, and the compact arrangement can be achieved. .

[0031]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 8 show a first embodiment of the present invention. 1 and 2, reference numeral 2 denotes an internal combustion engine having a plurality of cylinders. The internal combustion engine 2 has a cylinder block 4, a cylinder head 6, a head cover 8, and a lower case 10, which are engine components.

In the internal combustion engine 2, a crankshaft 12, which is a rotating shaft, is supported on a cylinder block 4 by a lower case 10.
A crank sprocket 14, which is a rotary motion transmitting body, is attached to one end of the crankshaft 12 in the axial direction.

In the internal combustion engine 2, an intake camshaft 16 and an exhaust camshaft 18 which are rotating shafts of the cylinder head 6 are supported by an intake camcap and an exhaust camcap (not shown), respectively. The intake camshaft 16 and the exhaust camshaft 18 are provided with an intake-side mounting boss 20 and an exhaust-side mounting boss 22 at one end in the axial direction, and are positioned on the intake-side mounting boss 20 and the exhaust-side mounting boss 22. Are provided with an intake side through hole 24 and an exhaust side through hole 26.

The intake-side mounting boss 20 and the exhaust-side mounting boss 22 of the intake camshaft 16 and the exhaust camshaft 18 include:
An intake sprocket 28 and an exhaust sprocket 30, which are rotary motion transmitters, are respectively mounted. Intake sprocket 2
8 and the exhaust sprocket 30, the intake side mounting portion 3
2 and an exhaust-side mounting portion 34, and an intake-side mounting hole 36 and an exhaust-side mounting hole 38 that are fitted and pressed into the intake-side mounting boss 20 and the exhaust-side mounting boss 22. In the intake-side mounting hole 36 and the exhaust-side mounting hole 38, there are provided an intake-side cutout portion 40 and an exhaust-side cutout portion 42 for positioning a groove shape oriented in the axial direction of the intake camshaft 16 and the exhaust camshaft 18. ing.

A timing chain 44 as an endless rotary motion transmitting device is wound around the crank sprocket 14, the intake sprocket 28 and the exhaust sprocket 30. The timing chain 44 includes the chain tensioner 4
6 and the chain holder 48 are applied with a predetermined tension and held, and the rotational force of the crankshaft 12 is applied to the intake camshaft 16.
The rotation of the intake camshaft 16 and the exhaust camshaft 18 is synchronized with the crankshaft 12.

As shown in FIG. 1, the crank sprocket 14, the intake sprocket 28, the exhaust sprocket 30, and the timing chain 44 are covered with a chain cover 50 as an envelope. Chain cover 50
Is attached to the cylinder head 4 and the cylinder block 6 at one end in the axial direction of the crankshaft 12.

The internal combustion engine 2 includes a crankshaft 12 serving as a rotating shaft, an intake camshaft 16, or an exhaust camshaft 1.
8, a rotation angle detection device 52 for detecting a rotation angle is provided. The rotation angle detection device 52 according to the first embodiment detects the rotation angle of the intake camshaft 18.

As shown in FIGS. 3 to 5, the rotation angle detecting device 52 integrally includes a sensing rotor 54, which is a discriminator for detecting a rotation angle, on the intake side attachment portion 32 of the intake sprocket 28 to the intake camshaft 14. Is provided. Intake side mounting part 3
The intake side mounting hole 36 is provided in the sensing rotor 54 provided integrally with the sensor 2. The sensing rotor 54 is provided on the side facing the chain cover 50 as shown in FIG.

Chain cover 5 of sensing rotor 54
On the side facing 0, an identification surface 56 is provided. The identification surface 56 is provided in a planar shape that intersects at right angles with the axis of the intake camshaft 16. An identification portion 58 corresponding to the rotation angle of the intake camshaft 14 is provided on the identification surface 56 having a planar shape so as to face the chain cover 50 in a radially outer circumferential direction.

In the intake side mounting hole 36 located on the identification surface 56 radially inside the identification portion 58, the positioning intake air that is directed in the axial direction of the intake camshaft 16 and reaches the identification surface 58. A side notch 40 is provided. The identification portion 58 of this embodiment is provided in a groove shape so as to face the sensor 60 serving as a detecting means in the circumferential direction of the identification surface 56.

The identification section 58 is identified by the sensor 60 and detects the rotation angle of the intake camshaft 14. The sensor 60 is, as shown in FIGS.
And is provided on the side of the chain cover 50 that faces. The chain cover 50 facing the sensing rotor 54 has an insertion hole 62 through which the sensor 60 is inserted. As shown in FIG. 2, the sensor 60 is inserted through the insertion hole 62, the flange 64 abuts on the chain cover 50, and is attached to the cylinder head 6 by an attachment bolt 66 so as to face the identification portion 58.

Next, the operation of the first embodiment will be described.

As shown in FIGS. 1 and 2, the internal combustion engine 2 is driven by the timing chain
The intake camshaft 16 and the exhaust camshaft 18 are rotated in synchronism with the rotation of the intake and exhaust valves (not shown) to open and close.

As shown in FIGS. 6 and 7, the rotation angle detecting device 52 is opposed to the chain cover 50 on the identification surface 56 of the sensing rotor 54 provided integrally with the intake side mounting portion 32 of the intake camshaft 16. Is provided with an identification portion 58 corresponding to the rotation angle of the intake camshaft 14, and the identification portion 58 is identified by a sensor 60 provided on the chain cover 50 side to detect the rotation angle.

The sensor 60 is, as shown in FIG.
6 and a distance a2 to the bottom surface 68 of the groove-shaped discriminating portion 58, different voltages are generated, and the generated voltage is formed into a rectangular wave at a threshold level by a sensor circuit (not shown) having a built-in voltage. I do. The rectangular wave output from the sensor 60 is input to control means (not shown), and is used to determine a cylinder, a crank angle, and the like.

The rotation angle detection device 52 of the first embodiment
Is provided with a sensing rotor 54 for identifying a rotation angle on the intake side attachment portion 32 of the intake sprocket 28 attached to the intake camshaft 16 of the internal combustion engine 2.
4 and the intake camshaft 16 on the side facing the chain cover 50.
By providing the groove-shaped identification portion 58 corresponding to the rotation angle of the intake camshaft 1 and the intake sprocket 28,
No increase in the axial length of 6 occurs.

The rotation angle detecting device 52 of the first embodiment
Inserts a sensor 60 that identifies the identification portion 58 and detects the rotation angle of the intake camshaft 16 into the insertion hole 62 of the chain cover 50 that faces the sensing rotor 54, and
By being attached to the cylinder head 6 so as to face the cylinder head 6, the vibration of the chain cover 50 can be suppressed, and the layout of the sensor 60 can be simplified.
0 can be arranged close to the identification body 58.

The sensing rotor 54 is provided integrally with the intake side attachment portion 32 of the intake sprocket 28, and has an identification surface 56 on the side facing the chain cover 50, and faces the sensor 60 in the circumferential direction of the identification surface 56. By providing the identification portion 58 so that the intake sprocket 28, the sensing rotor 54, and the identification portion 58 can be simultaneously processed, the number of processes and the number of assemblies can be reduced, and the sensing rotor for the intake cam shaft 16 can be reduced. 54 can improve the position accuracy,
The assembly error can be eliminated, and the sensor 60 can be arranged close to the sensing rotor 54 without increasing the size of the intake sprocket 28 or increasing the axial length of the intake camshaft 16. .

That is, the rotation angle detecting device 52 of the first embodiment.
Is provided with the identification portion 58 using the identification surface 56 perpendicular to the axis of the intake camshaft 16, so that the intake side mounting portion 3 is provided.
The detection becomes possible by providing the identification portion 58 having a small depth to the sensing rotor 54 provided integrally with the sensor rotor 2.
23 to 25, when detection is performed by a sensor 118 provided on the peripheral edge 114 of the sensing rotor 112 so as to be directed to the center in the radial direction, the sensor 118 and the rotation shaft are used. The sensible rotor 1 responds to minute changes in the relative position with respect to the crankshaft 104.
There is a problem that the height of the projection 116 must be increased due to a large change in the distance between the peripheral edge 114 of the twelve and the projection 116 protruding from the peripheral edge 114.

On the other hand, the rotation angle detecting device 52 of the first embodiment performs the detection by providing the identification portion 58 on the identification surface 56 of the sensing rotor 54 perpendicular to the axis of the intake camshaft 16 as described above. Accordingly, a change in the distance between the sensor 60 and the identification unit 58 can be reduced with respect to a change in machining position or a variation when the internal combustion engine 2 is driven. In this way, the detection can be performed, and the intake sprocket 28 provided with the sensing rotor 54 can be prevented from being enlarged.

The rotation angle detecting device 52 of the first embodiment
As shown in FIGS. 1 and 2, an identification surface 56 orthogonal to the axial direction of the intake camshaft 16 is provided radially inward of the teeth 68 of the intake sprocket 28 driven by the timing chain 44. By providing the identification portion 58 on the surface 56, the sensor 60 can be arranged to be separated from the teeth 68 of the intake sprocket 28, and erroneous detection by the teeth 68 of the intake sprocket 28 can be prevented.

Further, the rotation angle detecting device 5 of the first embodiment
2 is that the sensor 60 is disposed on the side of the chain cover 50 and is attached to the cylinder head 6 through the insertion hole 62 of the chain cover 50, whereby the vibration of the chain cover 50 is suppressed and prevented by the flange 64 of the sensor 60. Can be shaken.

For this reason, the rotation angle detecting device 52 of the first embodiment can avoid an increase in the size of the intake sprocket 58 in which the sensing rotor 54 for detecting the rotation angle is provided, and reduce the layout restriction of the sensor 60. Thus, the vibration of the chain cover 50 can be reduced, the positional accuracy of the sensing rotor 54 with respect to the intake camshaft 16 can be improved, the number of assembly steps can be reduced, the weight can be reduced, and the cost can be reduced. Therefore, erroneous detection of the rotation angle can be prevented, and the reliability of control based on the rotation angle can be improved.

FIGS. 9 to 13 show a second embodiment of the present invention. In the second embodiment, portions that perform the same functions as those in the first embodiment shown in FIGS.

9 and 10, an internal combustion engine 2 includes a cylinder block 4, a cylinder head 6,
The lower case 10 has a head cover 8 and a lower case 10. The lower case 10 supports a crankshaft 12 on the cylinder block 4. A crank sprocket 14 is mounted on one end of the crankshaft 12 in the axial direction.

The internal combustion engine 2 is provided with an intake-side mounting boss 20 and an exhaust-side mounting boss 22 at one axial end of an intake camshaft 16 and an exhaust camshaft 18 which are rotating shafts supported by the cylinder head 6. An intake side through hole 24 and an exhaust side through hole 26 for positioning are provided in the intake side attachment boss portion 20 and the exhaust side attachment boss portion 22.

The intake side mounting boss 20 and the exhaust side mounting boss 22 of the intake camshaft 16 and the exhaust camshaft 18 include:
An intake sprocket 28 and an exhaust sprocket 30, which are rotary motion transmitters, are respectively mounted. Intake sprocket 2
8 and the exhaust sprocket 30, the intake side mounting portion 3
2 and an exhaust-side mounting portion 34, and an intake-side mounting hole 36 and an exhaust-side mounting hole 38 that are fitted and pressed into the intake-side mounting boss 20 and the exhaust-side mounting boss 22. In the intake-side mounting hole 36 and the exhaust-side mounting hole 38, there are provided an intake-side cutout portion 40 and an exhaust-side cutout portion 42 for positioning a groove shape oriented in the axial direction of the intake camshaft 16 and the exhaust camshaft 18. ing.

A timing chain 44 as an endless rotary motion transmitting device is wound around the crank sprocket 14, the intake sprocket 28 and the exhaust sprocket 30. The timing chain 44 includes the chain tensioner 4
6 and the chain holder 48 are applied with a predetermined tension and held, and the rotational force of the crankshaft 12 is applied to the intake camshaft 16.
The rotation of the intake camshaft 16 and the exhaust camshaft 18 is synchronized with the crankshaft 12.

As shown in FIG. 9, the crank sprocket 14, the intake sprocket 28, the exhaust sprocket 30, and the timing chain 44 are covered with a chain cover 50 as an envelope. Chain cover 50
Is attached to the cylinder head 4 and the cylinder block 6 at one end in the axial direction of the crankshaft 12.

The internal combustion engine 2 includes a crankshaft 12 serving as a rotating shaft, an intake camshaft 16, or an exhaust camshaft 1.
8, a rotation angle detection device 52 for detecting a rotation angle is provided. The rotation angle detection device 52 according to the second embodiment detects the rotation angle of the intake camshaft 18.

The rotation angle detecting device 52 is shown in FIGS.
As shown in the figure, a sensing rotor 54 as an identification body for identifying a rotation angle is integrally provided on the intake side attachment portion 32 of the intake sprocket 28 to the intake camshaft 14. The sensing side mounting hole 32 is provided in the sensing rotor 54 provided integrally with the intake side mounting portion 32. The sensing rotor 54 is provided on the side facing the chain cover 50 as shown in FIG.

An identification surface 56 is provided on the side of the sensing rotor 54 facing the chain cover 50. The identification surface 56 is provided in a planar shape that intersects at right angles with the axis of the intake camshaft 16. An identification portion 58 corresponding to the rotation angle of the intake camshaft 14 is provided on the identification surface 56 having a planar shape so as to face the chain cover 50 in a radially outer circumferential direction.
Is provided.

The positioning side intake hole 36, which is located on the identification surface 56 radially inside the identification portion 58 in the axial direction of the intake camshaft 16 and reaches the identification surface 58, is provided in the intake side mounting hole 36. A side notch 40 is provided. The discriminating portions 58 are provided in the circumferential direction of the discriminating surface 56 so as to be respectively recessed in a groove shape so as to face the sensor 60 serving as detecting means. As shown in FIG. 11, the intake side cutout portion 40 is provided on the identification surface 56 so as to be located on the same radial line L as one of the identification portions 58.

The identification section 58 is identified by the sensor 60 and detects the rotation angle of the intake camshaft 14. The sensor 60 is provided on the chain cover 50 side facing the sensing rotor 54, as shown in FIG. The chain cover 50 facing the sensing rotor 54 has an insertion hole 62 through which the sensor 60 is inserted. Sensor 6
9 is inserted into the insertion hole 62, the flange 64 is brought into contact with the chain cover 50 as shown in FIG.
Mounting bolt 66 on cylinder head 6 so as to face
It is attached by.

Next, the operation of the second embodiment will be described.

The internal combustion engine 2 is, as shown in FIGS.
At the time of driving, the crankshaft 1 is driven by the timing chain 44.
2 and the intake camshaft 16 and the exhaust camshaft 18
To open and close an intake valve and an exhaust valve (not shown).

The rotation angle detecting device 52 is shown in FIGS.
As shown in the figure, the identification portion 58 corresponding to the rotation angle of the intake camshaft 14 is provided on the identification surface 56 of the sensing rotor 54 provided integrally with the intake side attachment portion 32 of the intake camshaft 16 so as to face the chain cover 50. The identification portion 58 is identified by a sensor 60 provided on the chain cover 50 side to detect the rotation angle.

As shown in FIG. 12, the sensor 60 generates different voltages depending on the distance a1 to the identification surface 56 and the distance a2 to the bottom surface 68 of the groove-shaped identification portion 58, as shown in FIG. The generated voltage is formed into a rectangular wave at a threshold level by a sensor circuit (not shown) having a built-in voltage.
The rectangular wave output from the sensor 60 is input to control means (not shown), and is used to determine a cylinder, a crank angle, and the like.

The rotation angle detecting device 52 of the second embodiment
The identification portion 58 corresponding to the rotation angle of the intake cam shaft 14 is provided on the identification surface 56 of the sensing rotor 54 integrally provided on the intake side attachment portion 32 of the intake cam shaft 16 so as to face the chain cover 50. The sensor 60 for identifying the identification portion 58 and detecting the rotation angle is connected to the chain cover 50.
It is provided on the side.

For this reason, the rotation angle detecting device 52 of the second embodiment can provide the same effects as those of the first embodiment.

The rotation angle detection device 52 of the second embodiment
Are recessed on the identification surface 56 of the sensing rotor 54 integrally provided on the intake side mounting portion 32 of the intake sprocket 28 so as to face the chain cover 50 and correspond to the rotation angle of the intake camshaft 14. With this arrangement, a mounting jig (not shown) can be easily attached to the identification portion 58 when the intake sprocket 28 is attached to the intake camshaft 16 without interference, and the weight can be reduced. Can be.

That is, when attaching the intake sprocket 28 and the exhaust sprocket 30 to the intake camshaft 16 and the exhaust camshaft 18, first, the intake camshaft 16 and the exhaust camshaft 1
8 for positioning the intake side through hole 24 and the exhaust side through hole 2
6, the intake sprocket 28 and the exhaust sprocket 30 are positioned relative to the intake camshaft 16 and the exhaust camshaft 18 by the intake side notch 40 and the exhaust side notch 42 for positioning. It is positioned and press-fitted into the intake-side mounting boss 20 and the exhaust-side mounting boss 22 by the intake-side mounting hole 36 and the exhaust-side mounting hole 38.

This press-fitting is performed by an automatic machine.
At this time, the intake sprocket 28 and the exhaust sprocket 30, and the intake camshaft 16 and the exhaust camshaft 18 are rotated to position the intake side through hole 24 and the exhaust side through hole 2 for positioning.
6 and the intake side notch 40 and the exhaust side notch 4 for positioning
Searching for 2. At this time, if the identification portion 58 is provided so as to protrude from the identification surface 56 of the sensing rotor 54, the mounting jig interferes with the identification portion 58 and the sprocket 2
8.30 cannot be rotated.

The rotation angle detection device 52 of the second embodiment
Is provided on the identification surface 56 of the sensing rotor 54 by recessing the identification portion 58 so that the intake sprocket 28
When the is mounted on the intake camshaft 16, the mounting jig does not interfere with the identification portion 58, and can be easily mounted, and the weight can be reduced.

The intake sprocket 28 provided with the sensing rotor 54 is provided with the intake side notch 40 for positioning reaching the identification surface 56 and the identification portion 58 corresponding to the rotation angle. Therefore, the sensor 60
In some cases, the intake side notch 40 for positioning may be erroneously recognized as the identification unit 58 and detected as a signal of the rotation angle as shown in FIG. In this case, there is a disadvantage that the reliability of the control based on the rotation angle is impaired.

The rotation angle detection device 52 of the second embodiment
As shown in FIG. 11, a discriminating portion 58 is provided in a circumferential direction radially outside a discriminating surface 56 of the sensing rotor 54 facing the chain cover 50, and a discriminating surface 56 radially inside the discriminating portion 58. The intake side cutout 40 provided in the intake side mounting hole 36 located at
Is provided so as to be located on the same diameter line L as one of them.

As a result, in the rotation angle detecting device 52 of the second embodiment, the signal by which the sensor 60 misidentifies the intake side cutout 40 as the identification unit 58 matches the signal of the normal identification of the identification unit 58. Therefore, the rotation angle is not erroneously detected.

For this reason, the rotation angle detection device 52 of the second embodiment can prevent erroneous detection of the rotation angle, and can improve the reliability of control based on the rotation angle.

FIG. 16 shows a third embodiment of the present invention. Note that, in the third embodiment, FIGS.
Parts that perform the same functions as in the first embodiment shown in FIG.

The rotation angle detecting device 52 of the third embodiment includes an intake side mounting portion 32 of the intake camshaft 16 and the intake side mounting portion 3.
2, an intake-side mounting hole 36 is provided on the sensing rotor 54 integrally provided with the sensing rotor 54, and an identification surface 56 is provided on a side of the sensing rotor 54 facing the chain cover 50. An identification portion 58 corresponding to the rotation angle is provided in a recessed manner so as to face the sensor 60, and is directed in the axial direction of the intake camshaft 16 into the intake side mounting hole 36 located radially inside the identification portion 58. In addition, the intake side notch 40 reaching the identification surface 56 is provided, and the intake side notch 40 is provided on the identification surface 56 so as to be located on the same diameter line L as one of the identification portions 58 and the circumferential direction of the identification surface 56. Is provided so as to have the same width W as the identification portion 58.

The rotation angle detection device 52 of the third embodiment
Is the same diameter line L as the one of the identification portions 58
By being provided above and having the same width W as the identification unit 58, the width of the intake side notch 40 is erroneously identified as the identification unit 58 so that the width of the signal that is erroneously identified as the identification unit 58 is equal to the width of the signal of the identification unit 58. Can be matched.

Therefore, the rotation angle detecting device 52 of the third embodiment can provide the same effect as that of the first embodiment, and can more reliably prevent erroneous detection of the rotation angle by the sensor 60. it can.

FIG. 17 shows a fourth embodiment of the present invention. In the fourth embodiment, the aforementioned FIGS.
Parts that perform the same functions as in the first embodiment shown in FIG.

The rotation angle detecting device 52 of the fourth embodiment includes an intake side attachment portion 32 of the intake camshaft 16 and the intake side attachment portion 3.
2, an intake-side mounting hole 36 is provided on the sensing rotor 54 integrally provided with the sensing rotor 54, and an identification surface 56 is provided on a side of the sensing rotor 54 facing the chain cover 50. An identification portion 58 corresponding to the rotation angle is provided so as to be depressed so as to face the sensor 60 along the intake side mounting hole 36, and is directed in the axial direction of the intake camshaft 16 in the intake side mounting hole 36. An intake side notch 40 reaching the intake camshaft 16 is provided on the identification surface 56 of the identification section 58.
It is provided so as to overlap with one another.

As described above, in the rotation angle detecting device 52 of the fourth embodiment, the intake side notch 40 is provided so as to coincide with one of the identification portions 58 provided along the intake side mounting hole 36, so that the intake air is cut off. The side cutout portion 40 can be used as one of the identification portions 58, the number of processing portions can be reduced by reducing the number of the identification portions 58, and the recognition of the intake side cutout portion 40 by the sensor 60 is performed by regular identification. The identification of the portion 58 can be performed, and the rotation angle is not erroneously detected.

Therefore, the rotation angle detecting device 52 of the fourth embodiment can provide the same effects as those of the first embodiment, and can more reliably prevent erroneous detection of the rotation angle by the sensor 60. it can.

FIG. 18 shows a fifth embodiment of the present invention. In the fifth embodiment, FIGS.
Parts that perform the same functions as in the first embodiment shown in FIG.

The rotation angle detecting device 52 of the fifth embodiment includes an intake side mounting portion 32 of the intake camshaft 16 and the intake side mounting portion 3.
2, an intake-side mounting hole 36 is provided on the sensing rotor 54 integrally provided with the sensing rotor 54, and an identification surface 56 is provided on a side of the sensing rotor 54 facing the chain cover 50. An identification portion 58 corresponding to the rotation angle is provided in a recessed manner so as to face the sensor 60, and is directed in the axial direction of the intake camshaft 16 into the intake side mounting hole 36 located radially inside the identification portion 58. At the same time, the intake side notch 40 reaching the identification surface 56 is provided, and the identification surface 5
An annular stepped portion 70 is provided in the circumferential direction of 6, extending from the intake-side mounting hole 36 to the radially outermost end 40e of the intake-side cutout portion 40 and having a depth equal to or greater than the depth of the identification portion 58.

As described above, the rotation angle detecting device 52 of the fifth embodiment extends from the intake-side mounting hole 36 to the radially outermost end 40e of the intake-side notch 40 in the circumferential direction of the identification surface 56, and identifies the identification portion 58. By providing the annular step portion 70 depressed to the same depth or more, it is possible to judge under the same conditions whether the identification portion 58 is provided on the identification surface 56 and the portion where the identification portion 58 is not provided. Can be eliminated.

For this reason, the rotation angle detecting device 52 of the fifth embodiment can provide the same effects as those of the first embodiment, and can more reliably prevent erroneous detection of the rotation angle by the sensor 60. it can. Further, the rotation angle detection device 52 of the fifth embodiment can more reliably prevent the rotation angle from being erroneously detected by the sensor 60 by being applied to the identification surface 56 of the first embodiment. The step 7
The depth h1 of 0 is equal to the depth h2 of the identification unit 58 (h1
= H2) or larger than the depth h2 of the identification unit 58 (h1> h).
2).

FIG. 19 shows a sixth embodiment SG1 of the present invention. In the sixth embodiment, the same reference numerals will be given to portions having the same functions as those in the first embodiment shown in FIGS.

In each of the above embodiments, a plane intersecting the axis of the intake camshaft 16 at right angles to the axis of the intake camshaft 16 is provided on the side facing the chain cover 50 of the sensing rotor 54 integrally provided on the intake side mounting portion 32 of the intake sprocket 28. Shape identification surface 5
6 are provided.

The rotation angle detecting device 52 according to the sixth embodiment includes an axis of the intake camshaft 16 on a side facing the chain cover 50 of the sensing rotor 54 integrally provided on the intake side mounting portion 32 of the intake sprocket 28. A conical identification surface 56 that intersects at an angle is provided. Sensing rotor 5
4 is provided with an identification unit 58 in the circumferential direction of the identification surface 56 having a conical surface shape so as to face the sensor 60.

As described above, the rotation angle detecting device 52 of the sixth embodiment includes the chain cover 50 of the sensing rotor 54.
The sensor 60 is attached to the sensing rotor 54 by providing a conical identification surface 56 that is inclined and intersects with the axis of the intake camshaft 16 on the side facing the intake cam shaft 16, and the identification portion 58 is provided in the circumferential direction of the identification surface 56. It can be arranged in close proximity and can be compactly arranged.

Therefore, the rotation angle detecting device 52 of the sixth embodiment can provide the same effects as those of the first embodiment, and can further contribute to downsizing of the internal combustion engine 2.

FIG. 20 shows a seventh embodiment SG2 of the present invention. Seventh Embodiment Rotation Angle Detector 52
The sensing rotor 54 provided integrally with the intake side mounting portion 32 of the intake sprocket 28 has a flat identification surface 56 intersecting at right angles with the axis of the intake camshaft 16 on the side facing the chain cover 50. Identification surface 56 having a planar shape
An identification portion 58 having a triangular cross section in a radially outer circumferential direction is provided so as to protrude therefrom.

The identification unit 58 includes the sensing rotor 5
4 is provided with a projecting surface 72 inclined with respect to the identification surface 56 so as to be directed obliquely forward in the rotation direction of the sensor 4. It is provided on the cover 50 side inclining.

The rotation angle detecting device 52 of the seventh embodiment
Is provided with an inclined protruding surface 72 at an identification portion 58 protruding from an identification surface 56 having a planar shape of the sensing rotor 54, and a sensor 60 is provided obliquely so as to face the protruding surface 72, so that the sensor 60 is sensed. It can be arranged close to the rotor 54 and can be located radially inward of the sensing rotor 54, so that it can be arranged compactly and the internal combustion engine 2 can be made more compact.

Further, the rotation angle detecting device 52 of the seventh embodiment
Is that the height of the protruding surface 72 from the identification surface 56 is not constant as in the above-described embodiments, and the sensing rotor 5
Since the height changes with the rotation of the sensor 4, the sensor 6
0 can be changed more greatly,
The rotation angle can be detected more accurately.

FIG. 21 shows an eighth embodiment SG3 of the present invention. Rotation angle detection device 52 of eighth embodiment
The sensing rotor 54 provided integrally with the intake side mounting portion 32 of the intake sprocket 28 has a flat identification surface 56 intersecting at right angles with the axis of the intake camshaft 16 on the side facing the chain cover 50. Identification surface 56 having a planar shape
An identification portion 58 having a triangular groove shape in cross section is provided so as to be depressed in the circumferential direction on the outer side in the radial direction.

The identification unit 58 includes the sensing rotor 5
4 is provided with a concave surface 74 inclined with respect to the identification surface 56 so as to be directed obliquely forward in the rotation direction of the sensor 4, and the sensor 60 is chained so as to face the concave surface 74 and be directed obliquely rearward in the rotational direction of the sensing rotor 54. It is provided on the cover 50 side inclining.

The rotation angle detector 52 of the eighth embodiment
Is provided with an inclined protruding surface 72 at an identification portion 58 protruding from a planar identification surface 56 of the sensing rotor 54, and a sensor 60 which is inclined opposite to the protruding surface 72, whereby the sensor 60 is 54 and can be located radially inward of the sensing rotor 54, so that the internal combustion engine 2 can be further downsized.

Further, the rotation angle detecting device 52 of the eighth embodiment
The height of the concave surface 74 from the identification surface 56 is not constant as in the above-described embodiments by moving the identification portion 58 so as to intersect the sensor 60, and the sensing rotor 5
Since the height changes with the rotation of the sensor 4, the sensor 6
0 can be changed more greatly,
The rotation angle can be detected more accurately.

FIG. 22 shows a ninth embodiment SG4 of the present invention. Rotation angle detection device 52 of ninth embodiment
The sensing rotor 54 provided integrally with the intake side mounting portion 32 of the intake sprocket 28 has a flat identification surface 56 intersecting at right angles with the axis of the intake camshaft 16 on the side facing the chain cover 50. Identification surface 56 having a planar shape
An identification portion 58 that protrudes in a radially outer circumferential direction in a triangular cross section and is recessed in a triangular groove shape is provided.

The identification unit 58 includes the sensing rotor 5
4 is provided with a plane 76 which is inclined so as to intersect with the identification surface 56 so as to be directed obliquely forward in the rotation direction of the sensor 4. Are provided on the chain cover 50 side.

The rotation angle detector 52 of the ninth embodiment
Is provided with an inclined plane 76 on the discriminating portion 58 that protrudes from the planar identification surface 56 of the sensing rotor 54 and is depressed, and a sensor 60 that is inclined opposite to this plane 74 is provided. Can be disposed close to the sensing rotor 54 and can be positioned radially inward of the sensing rotor 54, so that the internal combustion engine 2 can be downsized.

Further, the rotation angle detecting device 52 of the ninth embodiment
Is that the height of the plane 76 from the identification surface 56 is not constant as in the above-described embodiments, and the area of the plane 76 is Since the height is larger than the protruding surface 72 and the concave surface 74 in the seventh and eighth embodiments, the height of the plane 76 from the identification surface 56 changes greatly with the rotation of the sensing rotor 54, and thus the sensor The voltage output by the output terminal 60 can be further greatly varied, and the rotation angle can be detected more accurately.

In each of the above embodiments, the sensing rotor 54 is provided integrally with the intake sprocket 28. However, the sensing rotor 54 can be applied to the crank sprocket 14 and the exhaust sprocket 30. It can also be applied to pulleys (not shown). Further, the identification portion 58 is provided in the identification surface 56 of the sensing rotor 54 so as to be recessed in a groove shape, but may be provided so as to protrude in a bank shape.

[0109]

As described above, the rotation angle detecting device for an internal combustion engine according to the present invention does not increase the size of the rotary motion transmitting body or increase the length of the rotary shaft in the axial direction. This makes it easy to dispose the detection means in close proximity to the identification body, and can also suppress the vibration of the envelope, increase the size of the rotary motion transmitter and reduce the axial length of the rotary shaft. It is possible to arrange the detection means close to the identification body without causing an increase.

Further, according to the rotation angle detecting device of the present invention, when the rotary motion transmitter is mounted on the rotary shaft, the mounting jig does not interfere with the discriminating portion, the mounting can be easily performed, and the weight can be reduced. Since the timing at which the notch is erroneously identified as the identification unit by the detection unit coincides with the normal identification timing of the identification unit, the rotation angle is not erroneously detected.

Further, the rotation angle detecting device of the present invention
The notch portion can be used as one of the identification portions, the number of the identification portions can be reduced, the weight can be reduced, and the recognition of the notch portion by the detecting means can be used as the identification of the regular identification portion. An angle is not erroneously detected, and it is possible to determine a part provided with the identification part on the identification surface and a part without the identification part under the same condition, thereby eliminating erroneous recognition.

In the rotation angle detecting device according to the present invention, the layout of the detecting means is facilitated, the detecting means can be arranged close to the discriminating body, and the length of the detecting means protruding from the enclosing body can be improved. The length can be shortened and the arrangement can be made compact.

Therefore, the rotation angle detecting device according to the present invention can avoid an increase in the size of the rotary motion transmitting member provided with the identification member for detecting the rotation angle, can reduce the restriction on the layout of the detecting means, and The vibration of the package can be reduced, the position accuracy of the identification body with respect to the rotation axis can be improved, the assembly man-hour can be reduced, the weight can be reduced, the cost can be reduced, and the rotation angle can be reduced. Can be prevented from being erroneously detected, the reliability of control based on the rotation angle can be improved, and the present invention can be applied to an existing rotation angle detection device.

[Brief description of the drawings]

FIG. 1 is a sectional view of an internal combustion engine provided with a rotation angle detecting device according to a first embodiment of the present invention.

FIG. 2 is a schematic front view of the internal combustion engine.

FIG. 3 is a front view of an intake sprocket.

FIG. 4 is a sectional view of an intake sprocket.

FIG. 5 is an enlarged sectional view of a main part of the intake sprocket.

FIG. 6 is an assembled perspective view of the rotation angle detection device.

FIG. 7 is a schematic sectional view of a rotation angle detection device.

FIG. 8 is a diagram illustrating a relationship between a position of a sensor with respect to an identification unit, a generated voltage, and a rectangular wave to be output.

FIG. 9 is a sectional view of an internal combustion engine provided with a rotation angle detecting device according to a second embodiment of the present invention.

FIG. 10 is a schematic front view of the internal combustion engine.

FIG. 11 is a front view of the intake sprocket.

FIG. 12 is a schematic sectional view of a rotation angle detection device.

FIG. 13 is an enlarged sectional view of a main part of the intake sprocket.

FIG. 14 is a diagram showing a rectangular wave output from a sensor.

FIG. 15 is a diagram illustrating a rectangular wave output from a sensor that has detected a positioning intake side notch portion as an identification portion.

FIG. 16 is a front view of an intake sprocket provided with a rotation angle detecting device according to a third embodiment of the present invention.

FIG. 17 is a front view of an intake sprocket provided with a rotation angle detecting device according to a fourth embodiment of the present invention.

FIG. 18 is a front view of an intake sprocket provided with a rotation angle detecting device according to a fifth embodiment of the present invention.

FIG. 19 is a schematic sectional view of a rotation angle detecting device according to a sixth embodiment of the present invention.

FIG. 20 is a schematic side view of a rotation angle detecting device according to a seventh embodiment of the present invention.

FIG. 21 is a schematic side view of a rotation angle detecting device according to an eighth embodiment of the present invention.

FIG. 22 is a schematic side view of a rotation angle detecting device according to a ninth embodiment of the present invention.

FIG. 23 is a cross-sectional view of a crankshaft provided with a rotation angle detection device showing a conventional example.

FIG. 24 is a rear view of the crank sprocket.

FIG. 25 is a sectional view of a crank sprocket.

FIG. 26 is an assembled perspective view of a rotation angle detection device showing another conventional example.

FIG. 27 is a cross-sectional view showing a relationship between a sensing rotor and a sensor.

FIG. 28 is an assembled perspective view of a rotation angle detection device showing still another conventional example.

[Explanation of symbols]

 2 Internal combustion engine 4 Cylinder block 6 Cylinder head 16 Intake camshaft 28 Intake sprocket 44 Timing chain 50 Chain cover 52 Rotation angle detection device 32 Intake side attachment part 36 Intake side attachment hole 40 Intake side notch 52 Rotation angle detection device 54 Sensing rotor 56 identification surface 58 identification unit 60 sensor

[Procedure amendment]

[Submission date] August 11, 1998

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 5

FIG. 6

FIG. 7

FIG. 13

FIG. 14

FIG.

FIG. 25

FIG. 8

FIG. 9

FIG. 10

FIG. 11

FIG.

FIG.

FIG. 16

FIG.

FIG.

FIG.

FIG. 21

FIG.

FIG. 23

FIG. 24

FIG. 26

FIG. 27

FIG. 28

Continued on the front page (72) Inventor Takashi Ito 300 Suzuki, Suzuki-cho, Hamamatsu-shi, Shizuoka Prefecture (72) Inventor Takashi Nakamura 300 Suzuki-Takazuka-cho, Hamamatsu-shi, Shizuoka Suzuki Co., Ltd. (72) Inventor, Kazuhiro Hounaga 300, Takatsuka-cho, Hamamatsu-shi, Shizuoka Suzuki Co., Ltd. (72) Inventor Shinji Yamada 300, Takatsuka-cho, Hamamatsu-shi, Shizuoka Suzuki Co., Ltd.

Claims (9)

[Claims] 1. An endless rotary motion transmitting device on which an endless rotary motion transmitting device is wound is provided at one axial end of a rotary shaft supported by an engine component of an internal combustion engine. An enclosing body that is attached to the engine component body so as to cover the rotational motion transmitting body, and an identification body for identifying a rotation angle is integrally provided at a mounting portion of the rotational motion transmitting body to the rotating shaft;
An identification unit corresponding to the rotation angle of the rotation shaft is provided on a side of the identification body facing the envelope, and detection means for identifying the identification unit and detecting the rotation angle of the rotation shaft is provided. A rotation angle detecting device for an internal combustion engine, characterized in that means is inserted into an insertion hole of an envelope facing the identification body and attached to the engine structure so as to face the identification portion. 2. The rotation angle detecting device according to claim 1, wherein an identification surface is provided on a side of the identification body provided integrally with the mounting portion of the rotational motion transmitting body, the identification surface being opposed to the envelope. The rotation angle detection device for an internal combustion engine according to claim 1, wherein the identification unit is provided so as to face the detection unit. 3. The rotation angle detecting device according to claim 1, wherein an identification surface is provided on a side of the identification body provided integrally with the mounting portion of the rotational motion transmitting body, the identification surface facing the enclosing body. 2. The rotation angle detecting device for an internal combustion engine according to claim 1, wherein the identification unit is provided so as to be depressed so as to face the detection unit. 4. The rotation angle detecting device, wherein a mounting hole is provided in a mounting portion of the rotary motion transmitting body and the identification body provided integrally with the mounting portion, and the mounting body of the identification body faces the enclosing body. The identification surface is provided on the side to be identified, and the identification portion is provided so as to be depressed so as to face the detecting means in the circumferential direction of the identification surface, and the rotation is provided in the mounting hole located radially inward of the identification portion. A notch for positioning, which is directed in the axis direction of the shaft and reaches the identification surface, is provided, and the notch is provided on the identification surface so as to be located on the same radial line as one of the identification portions. The rotation angle detection device for an internal combustion engine according to claim 3. 5. The rotation angle detecting device, wherein a mounting hole is provided in a mounting portion of the rotational motion transmitting body and the identification body provided integrally with the mounting portion, and the mounting body of the identification body faces the enclosing body. The identification surface is provided on the side to be identified, and the identification portion is provided so as to be depressed so as to face the detecting means in the circumferential direction of the identification surface, and the rotation is provided in the mounting hole located radially inward of the identification portion. A notch for positioning, which is directed in the axis direction of the shaft and reaches the identification surface, is provided, and the notch is provided so as to be located on the same diameter line as one of the identification portions on the identification surface, and the periphery of the identification surface is provided. 4. The rotation angle detection device for an internal combustion engine according to claim 3, wherein the rotation angle detection device is provided to have the same width as the identification unit in a direction. 6. The rotation angle detecting device, wherein a mounting hole is provided in a mounting portion of the rotational motion transmitting body and the identification body integrally provided in the mounting portion, and the mounting body of the identification body faces the enclosing body. The identification portion is provided on the side to be provided, and the identification portion is provided so as to be depressed so as to face the detection means along the mounting hole in the circumferential direction of the identification surface, and is provided in the mounting hole in the axial direction of the rotating shaft. The notch for positioning which is directed and reaches the identification surface is provided, and the notch is provided so as to overlap one of the identification portions on the identification surface. A rotation angle detection device for an internal combustion engine. 7. The rotation angle detecting device, wherein a mounting hole is provided in a mounting portion of the rotational motion transmitting body and the identification body provided integrally with the mounting portion, and the mounting body of the identification body faces the enclosing body. The identification surface is provided on the side to be identified, and the identification portion is provided so as to be depressed so as to face the detecting means in the circumferential direction of the identification surface, and the rotation is provided in the mounting hole located radially inward of the identification portion. A notch for positioning is provided that is directed in the axial direction of the shaft and reaches the identification surface, and extends from the mounting hole to a radially outermost end of the notch in the circumferential direction of the identification surface and has the same depth as the identification portion. 4. The rotation angle detecting device for an internal combustion engine according to claim 3, further comprising an annular step portion depressed more than that. 8. A rotation angle detecting device, comprising: a plane intersecting at right angles to an axis of the rotation shaft on a side of the identification body provided integrally with a mounting portion of the rotation movement transmitting body, the side facing the envelope; 8. The method according to claim 3, wherein an identification surface having a shape is provided, and the identification portion is provided so as to be depressed so as to face the detection means in a circumferential direction of the identification surface having the planar shape. A rotation angle detection device for an internal combustion engine according to any one of the preceding claims. 9. The rotation angle detection device according to claim 1, wherein the identification body provided integrally with the mounting portion of the rotation motion transmission body obliquely intersects with the axis of the rotation shaft on a side facing the envelope. 8. The method according to claim 3, wherein a conical identification surface is provided, and the identification portion is provided to be depressed so as to face the detection means in a circumferential direction of the conical identification surface. A rotation angle detection device for an internal combustion engine according to any one of the above.