JP3322076B2 - Mounting structure of crank angle sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a crank angle sensor in an engine.

[0002]

2. Description of the Related Art Conventionally, in order to accurately detect the crank angle of an engine, a ring gear is provided on the outer periphery of a flywheel or a drive plate attached to an output shaft of the engine, and an electromagnetic wave is provided facing a tooth surface of the ring gear. A pick-up type crank angle sensor is disposed (see Japanese Patent Application Laid-Open No. 61-144448).

In this case, the crank angle sensor has a sensor part formed in a housing member near a junction between an engine side housing member (cylinder block or oil pan) and a transmission side housing member (converter housing, etc.). The ring gear is opposed to the tooth surface of the ring gear with a very small gap facing the housing member.

[0004]

However, in such a conventional mounting structure of a crank angle sensor, when the crank angle sensor is mounted on a transmission side housing member, for example, when the clutch is replaced, the engine side is mounted. When the housing member and the transmission-side housing member are separated or reassembled, the sensor portion of the opposed crank angle sensor and the ring gear are likely to collide with each other with a small gap, so that the heavy engine-side housing member and the transmission-side housing are heavy. There is a problem that the sensor may be broken by being crushed by the member.

When the crank angle sensor is mounted on the engine side housing member, collision between the crank angle sensor and the ring gear can be avoided.
When the engine-side housing member and the transmission-side housing member are separated or re-assembled, the transmission-side housing member may collide with the crank angle sensor and damage the sensor part. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to reliably prevent damage to a crank angle sensor when an engine side housing member and a transmission side housing member are separated or assembled. With the goal.

[0007]

Therefore, in the invention according to the first aspect, a sensor portion of a crank angle sensor is formed through a window hole formed in a housing member near a joint between an engine side housing member and a transmission side housing member. And a cover for covering the head of a bolt connecting the engine side housing member and the transmission side housing member in the mounting structure of the crank angle sensor facing the tooth surface of the ring gear mounted on the output shaft of the engine. Is provided, and the main body of the crank angle sensor and the cover are jointly fastened to the housing member by a common bolt.

The invention according to claim 2 is characterized in that the main body of the crank angle sensor and the cover are fastened together to a transmission side housing member. The invention according to claim 3 is characterized in that the main body of the crank angle sensor and the cover are fastened together to the engine side housing member. The invention according to claim 4 is characterized in that the window for mounting the crank angle sensor is formed between the joining surfaces of the engine side housing member and the transmission side housing member.

In the invention according to claim 5, the cover is
It also serves as a crank angle sensor protective cover that covers the main body of the crank angle sensor, a part of which is extended to form a bolt cover that covers the head of the coupling bolt. . The invention according to claim 6 is characterized in that the main body of the crank angle sensor and the cover are jointly fastened to the housing member by one bolt.

[0010] In the invention according to claim 7, the crank angle sensor is prevented from rotating by fitting the sensor portion of the crank angle sensor and the window hole, and the cover is provided with an engaging portion for preventing rotation. And

[0011]

According to the first aspect of the invention, when the engine side housing member and the transmission side housing member are to be separated from each other, these coupling bolts are removed, but the heads of the bolts are covered by the cover. Therefore, it is necessary to remove this cover first because no tool can be inserted. For this purpose, the bolt fixing the cover is removed, but since this bolt fastens the crank angle sensor and the cover together, the crank angle sensor is removed together with the cover. . Therefore, the crank angle sensor is always removed before the engine side housing member and the transmission side housing member are separated from each other. Can be prevented.

In the invention according to the second aspect, the crank angle sensor and the cover are fastened together to the transmission side housing member, so that a collision between the crank angle sensor and the ring gear can be avoided. In the invention according to claim 3, the crank angle sensor and the cover are fastened together to the engine side housing member, so that a collision between the crank angle sensor and the transmission side housing member can be avoided.

In the invention according to claim 4, the window for mounting the crank angle sensor is formed between the joining surfaces of the engine side housing member and the transmission side housing member. The joint between the crank angle sensor and the ring gear or the collision between the crank angle sensor and the transmission-side housing member can be prevented beforehand by tightening together with the housing member. Since the crank angle sensor also serves as a crank angle sensor protection cover that covers the sensor body, not only can the crank angle sensor be protected from thermal load and the like, but also the number of parts can be prevented from increasing.

According to the sixth aspect of the present invention, since the two bolts are fastened together by one bolt, it can be easily attached and detached only by attaching and detaching one bolt. In the invention according to claim 7, not only the attachment and detachment can be performed by only attaching and detaching one bolt, but also the detent is secured, so that the bolt can be securely attached.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show one embodiment of the present invention. 1 is a perspective view of a main part of an engine and a transmission, FIG. 2 is a perspective view of a crank angle sensor mounting portion corresponding to a portion X in FIG. 1, and FIG. 3 is an enlarged sectional view of the crank angle sensor mounting portion.

In FIG. 1, reference numeral 1 denotes a rocker cover, 2 denotes a cylinder head, and 3 denotes a cylinder block, and these constitute an engine. Reference numeral 4 denotes a converter housing on the transmission side. In contrast to the cylinder block 3 as the engine side housing member, the converter housing 4 as the transmission side housing member is provided.
Are joined together and fixed by bolts 6.

On the other hand, as shown in FIG. 3, a ring gear 7 provided on the outer periphery of a flywheel or a drive plate attached to the output shaft of the engine is located in the converter housing 4. An electromagnetic pickup type crank angle sensor 8 is disposed so as to face the surface. That is, the sensor part (electromagnetic pickup part) 8a of the crank angle sensor 8 is made to face the housing 4 through the window hole 9 formed in the flange part 5 of the converter housing 4, and a small gap is formed on the tooth surface of the ring gear 7. I make them face each other.

A cover 10 is provided outside the converter housing 4 to cover the main body 8b of the crank angle sensor 8. The cover 10 is mainly for protecting the crank angle sensor 8 from heat of the upper exhaust gas recirculation pipe and the like. The main body 8b of the crank angle sensor 8 and the cover
10 is the one inserted in series into these mounting holes 8c and 10a.
The bolts 11 are fixed together on the outer surface of the flange portion 5 of the converter housing 4. In FIG. 1, reference numeral 12 denotes a screw hole formed on the outer surface of the flange portion 5 of the converter housing 4.

Here, the crank angle sensor 8 is a sensor unit 8
a fits into the window hole 9 to prevent rotation. The cover 10 is provided with an engagement portion 10b for preventing rotation, and the engagement portion 10b is engaged with the stopper surface 13 on the cylinder block 3 side to prevent rotation. Further, a part of the front end side of the cover 10 is extended to form a bolt cover portion 10c which covers the head of the coupling bolt 6 between the cylinder block 3 and the converter housing 4. That is, the distal end side of the cover 10 is extended above the bolt 6 mounting position, and further extended in the axial direction of the bolt 6, and is bent downward so as to cover the head of the bolt 6. In FIG. 3, reference numeral 14 denotes an insertion hole for the bolt 6 formed in the flange portion 5 of the converter housing 4.

Next, the operation will be described. When the converter housing 4 is removed from the cylinder block 3 on the engine side to separate them, these connecting bolts 6 are removed, but the heads of the bolts 6 are covered by the bolt cover portions 10c of the cover 10. Therefore, it is necessary to remove the cover 10 first. Then, for this purpose, the bolts 11 fixing the cover 10 will be removed,
Since the bolt 11 fastens the crank angle sensor 8 and the cover 10 together, the crank angle sensor 8
Will be removed.

Therefore, the cylinder block 3 on the engine side
Before the converter housing 4 is detached and separated therefrom, the crank angle sensor 8 is always removed.
At the time of separation, the sensor portion 8a of the crank angle sensor 8 does not contact the ring gear 7, and the crank angle sensor 8
Damage can be prevented beforehand. In this embodiment, a part of the crank angle sensor protection cover 10 that covers the main body 8b of the crank angle sensor 8 is extended to cover the head of the coupling bolt 6 between the cylinder block 3 and the converter housing 4. Since the bolt cover 10c is formed, one cover 10
In addition, the function of protecting the crank angle sensor 8 from heat load and the like and the function of preventing the bolt 6 from being removed before the crank angle sensor 8 is removed can be prevented from increasing the number of parts.

However, when a protective cover is not particularly required for the crank angle sensor 8, the cover 10 may have only the function of covering the head of the bolt 6. In this embodiment, the crank angle sensor 8 and the cover 10 are connected by one bolt.
Since the bolts 11 are tightened together, they can be easily attached and detached only by attaching and detaching one bolt 11. On the other hand, the crank angle sensor 8 has the sensor portion 8a fitted into the window hole 9 and is prevented from rotating. The cover 10 can be securely attached because the engaging portion 10b is engaged with the stopper surface 13 on the cylinder block 3 side to prevent rotation.

4 to 9 show another embodiment of the present invention. 4 is an exploded perspective view of the oil pan and the converter housing, FIG. 5 is an assembled perspective view of the same, FIG. 6 is a front view of the converter housing viewed from the direction A in FIG. 4, and FIG.
FIG. 8 is an enlarged view of a middle crank angle sensor mounting portion, and FIG.
FIG. 9 is a sectional view taken along the line CC in FIG.

Referring to FIGS. 4 and 5, reference numeral 101 denotes an oil pan which is an engine side housing member, and reference numeral 102 denotes a converter housing which is a transmission side housing member. These are joined with each other's flanges, and bolts 10
3 is fixed. This will be further described with reference to FIGS. A window 104 is formed at the joint between the oil pan 101 and the converter housing 102 and on the bottom side, and the sensor portion 105a of the crank angle sensor 105 is connected to the housing 10 through the window 104.
2 so as to face the tooth surface of the ring gear 106 with a small gap.

Further, a cover 107 is provided outside the housing 102 to cover the main body 105b of the crank angle sensor 105.
The crank angle sensor 105 and the cover 107 are fastened and fixed to the oil pan 101 by one common bolt 108. The cover 107 extends circumferentially downward along the oil pan 101 and the converter housing 102.
Here, the oil pan 101 and the converter housing 102
An oil guide channel 109 for spilled oil, which will be described later, is formed between the cover 107 and the cover 107, and the oil guide channel 109 is open near the bottommost position.

Then, a part of the front end of the cover 107 is extended and bent, so that the oil pan 101 and the converter housing 10 are bent.
Bolt cover 107a that covers the head of bolt 103 for connection with 2
Is formed. The window 104 and the crank angle sensor
An oil seal 110 is provided in a gap between the oil seal 105 and the oil seal 105.
Specifically, an oil seal mounting groove 111 is formed in a portion of the converter housing 102 where the window hole 104 is formed, an outer main body flange portion 110a of the oil seal 110 is mounted here, and an inner lip seal portion 110b is connected to a crank angle. It is in contact with the sensor 105.

A projection 112 is formed on the inner surface of the oil pan 101 and the converter housing 102 at a position on the front side of the opening of the window 104 when viewed in the engine rotation direction. Next, the operation will be described. If the converter housing 102 is removed from the oil pan 101 to separate them, these connecting bolts 103 will be removed.
The head of the bolt 103 is connected to the bolt cover 107a of the cover 107.
It is necessary to remove the cover 107 first because the tool is not covered by the cover 107. And for this,
The bolts 108 that secure the cover 107 will be removed.
Since the crank angle sensor 105 is fixed together with the cover 107, the crank angle sensor 105 is removed together with the cover 107. Therefore, before removing the converter housing 102 from the oil pan 101 and separating them, the crank angle sensor 105 is always removed, so that there is no danger of damaging the crank angle sensor 105 during separation. Damage can be prevented beforehand.

In this embodiment, when the oil seal of the torque converter comes off due to an abnormal situation such as a D range stall or a component failure, the A / T oil (converter oil) enters the converter housing 102. Due to the internal pressure and the rotation of the engine, the gas flows out from the window 104 for mounting the crank angle sensor 105 on the bottom side (gap between the crank angle sensor 105) and adheres to high temperature parts such as exhaust system parts. In view of the problem that fire or smoke may occur, this is addressed.

That is, in the unlikely event that the A / T oil flows out into the oil pan 101 and the converter housing 102,
Even if the oil spouts out of the housing 102 through the gap in the window hole 104 for mounting the crank angle sensor 105, the spouted oil
After colliding with the cover 107, the oil pan 101 and the converter housing 102
The oil guide 109 is guided by an oil guide passage 109 between the cover and the cover 107, and is released near the lowest position where the oil guide passage 109 is opened, and drops from this. Since there is no high-temperature portion below the vicinity of the bottommost position and only dripping on the road surface, no ignition or smoking occurs. In FIG. 7, the outflow path of the oil is indicated by arrows.

The window hole 104 and the crank angle sensor 10
Since the oil seal 110 is mounted in the gap with the gap 5, the oil can be prevented from being spouted from the gap, or the flow of the spouted oil can be reduced, thereby reducing the range of scattering. A / T oil is used in the converter housing
When the oil flows out into the housing 102, the oil flows in the housing 102 along the inner surface thereof in the direction of engine rotation. The flowing oil flows through the window 104 for mounting the crank angle sensor 105.
Before hitting the opening 112, it collides with the projection 112 and is guided by its inclined surface, so that the flow direction is changed inward. Therefore,
The dynamic pressure can be reduced, and direct ejection from the window 104 can be prevented.

In FIG. 4, reference numeral 113 denotes an oil pan 101.
And crank angle sensor 105 of converter housing 102
The cover is mounted above the mounting position of, and prevents splashing oil from jumping up and completely prevents adhesion to high-temperature parts such as exhaust system parts.

[0032]

As described above, according to the first aspect of the present invention, the crank angle sensor is always removed before removing the transmission side housing member from the engine side housing member and separating them. Therefore, there is no danger of damaging the crank angle sensor at the time of separation, and the effect of preventing damage to the crank angle sensor can be obtained.

According to the second aspect of the invention, a collision between the crank angle sensor and the ring gear can be avoided. According to the invention according to claim 3, a collision between the crank angle sensor and the transmission side housing member can be avoided beforehand. According to the fourth aspect of the present invention, it is possible to prevent collision between the crank angle sensor and the ring gear or between the crank angle sensor and the transmission side housing member. An effect is obtained that not only can the sensor be protected from a thermal load or the like, but also an increase in the number of components can be prevented.

According to the sixth aspect of the present invention, an effect is obtained that mounting and dismounting can be easily performed only by attaching and detaching one bolt. According to the seventh aspect of the present invention, not only the attachment and detachment can be performed only by attaching and detaching one bolt, but also the effect that the bolt can be securely attached by securing the detent is obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of an engine and a transmission showing an embodiment of the present invention.

FIG. 2 is a perspective view of a crank angle sensor mounting portion corresponding to a portion X in FIG. 1;

FIG. 3 is an enlarged sectional view of a mounting portion of a crank angle sensor.

FIG. 4 is an exploded perspective view of an oil pan and a converter housing showing another embodiment of the present invention.

FIG. 5 is an assembled perspective view of the same.

FIG. 6 is a front view of the converter housing viewed from a direction A in FIG. 4;

FIG. 7 is an enlarged view of a crank angle sensor mounting portion in FIG. 6;

8 is a view taken in the direction of arrow B in FIG. 7;

9 is a sectional view taken along the line CC in FIG. 8;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rocker cover 2 Cylinder head 3 Cylinder block (engine side housing member) 4 Converter housing (transmission side housing member) 5 Flange part 6 Coupling bolt 7 Ring gear 8 Crank angle sensor 8a Sensor part 8b Body part 8c Mounting hole 9 Window hole 10 Cover 10a Mounting hole 10b Engagement part 10c Bolt cover part 11 Bolt for joint tightening 12 Screw hole 13 Stopper surface 14 Bolt insertion hole 101 Oil pan (engine side housing member) 102 Converter housing (transmission side housing member) 103 Coupling bolt 104 Window hole 105 Crank angle sensor 105a Sensor part 105b Main body part 106 Ring gear 107 Cover 107a Bolt cover part 108 Co-tightening bolt

Claims (7)

(57) [Claims] 1. A ring gear attached to an output shaft of an engine with a sensor portion of a crank angle sensor facing a window hole formed in a housing member near a joint between an engine side housing member and a transmission side housing member. In a mounting structure of a crank angle sensor opposed to a tooth surface, a cover is provided to cover a head of a bolt connecting an engine side housing member and a transmission side housing member, and a main body of the crank angle sensor and the cover are connected to each other. A mounting structure for a crank angle sensor, wherein the mounting structure is fastened to a housing member by a common bolt. 2. The mounting structure for a crank angle sensor according to claim 1, wherein the main body of the crank angle sensor and the cover are fastened together to a transmission side housing member. 3. The mounting structure for a crank angle sensor according to claim 1, wherein the main body of the crank angle sensor and the cover are fastened together to an engine side housing member. 4. A window hole for mounting a crank angle sensor is formed between joining surfaces of an engine side housing member and a transmission side housing member.
A mounting structure for a crank angle sensor according to claim 1. 5. A cover which also serves as a crank angle sensor protective cover for covering a main body of the crank angle sensor, and a part of which is extended to form a bolt cover for covering a head of the coupling bolt. The mounting structure of the crank angle sensor according to claim 1, wherein the mounting structure is formed. 6. The crank angle sensor according to claim 1, wherein the main body of the crank angle sensor and the cover are fastened together to the housing member by a single bolt. Mounting structure. 7. The crank angle sensor is prevented from rotating by fitting a sensor portion of the crank angle sensor and a window hole, and an engaging portion for preventing rotation is formed on the cover. Mounting structure of the crank angle sensor.