JP5826002B2 - Engine cover structure - Google Patents

Description

  The present invention relates to an engine cover structure having a sensor mounting portion for detecting an angle of a crankshaft of an engine, and in particular, a cover member is provided on an outer surface of the engine, a crankshaft angle sensor is provided on the cover member, and an oil filter is provided. Is an invention relating to a cover structure of an engine when mounted on the same cover member.

  In an engine having a plurality of cylinders, fuel is sequentially burned between the cylinders by appropriately controlling the ignition timing in each cylinder. As the ignition timing control, a method of determining the ignition timing based on the angle from the reference position of the crankshaft is used. More specifically, a rotor that rotates integrally with the crankshaft is disposed at the end of the crankshaft, and the angle of the rotor is detected by an angle sensor.

  On the other hand, the camshaft that drives the valve for performing intake and exhaust in the cylinder is also driven by the rotation of the crankshaft. When power is transmitted to the camshaft with a chain, it is necessary to supply lubricating oil to the chain. When oil is supplied to a chain that is driven at high speed, the oil scatters, so a cover member that covers the front surface of the engine is required.

  When power is transmitted to the camshaft with a chain, a structure in which the rotor is installed on the crankshaft inside the cover member is conceivable. However, when such a structure is adopted, the oil is agitated by the rotor, and therefore the oil may be misted. The mist of oil in the crank chamber is recirculated to the intake air as blow-by gas and burned, which leads to promotion of oil consumption.

  Further, when the rotor is disposed inside the cover member, it is necessary to project the angle sensor inside the cover member. This requires high sealing performance to be provided to the seal portion of the angle sensor, leading to an increase in cost. Further, when oil adheres to the rotor and the angle sensor, not only the deterioration of these members but also the deterioration of the oil itself becomes a problem.

  Therefore, a structure in which the rotor and the angle sensor are arranged outside the cover member can be considered. However, outside the cover member, there is a possibility that stepping stones, road surface projections, etc. will fly off while traveling and collide with the rotor or angle sensor. Since these parts are sources of information for determining the ignition timing, the breakage of these members may lead to a deviation in the ignition timing or the loss of the ignition timing, resulting in an engine stall.

  With respect to such a problem, in Patent Document 1, the rotation of the crankshaft is transmitted to the camshaft via the chain, and then the crankshaft that penetrates the cover member that covers the chain and projects outside the cover member A rotating body that rotates integrally with the crankshaft is provided at the shaft end, a rotor and a sensor are disposed between the rotating body and the cover member, and a concave portion that accommodates the sensor is provided on the surface of the cover member that faces the rotating body. A formed engine is disclosed.

  In Patent Document 1, a driving pulley is disposed as a rotating body around a shaft end of a crankshaft protruding outside the cover member, and a V-belt for driving an AC generator and a water pump is wound around the shaft. Therefore, the drive pulley has a structure that covers the rotor and the angle sensor housed in the recess, so that these parts may be damaged by the jumping up of the stepping stones and the projections on the ground even outside the cover member. It is said that there is no.

JP-A-2-245424

  With the structure of Patent Document 1, the rotor and the angle sensor for knowing the angle of the crankshaft can be arranged outside the cover member. That is, these parts are not affected by the oil supplied to the chain that drives the camshaft inside the cover member. However, when replacing the angle sensor, the V-belt must be removed and the drive pulley removed. This is extremely poor workability.

  In recent years, the body has been made more compact and the engine room has been designed to be smaller. That is, the space around the engine has become very narrow. Therefore, removal of the drive pulley is envisioned even in situations where the engine must be taken off the mount. Therefore, it is necessary to remove the angle sensor relatively easily.

  The present invention has been conceived in view of the above problems, and a rotor and an angle sensor are arranged outside a cover member. Furthermore, an engine cover structure is provided in which a protruding wall shape is extended from the lower end of an oil filter arranged in the vicinity of the rotor toward the angle sensor so that the angle sensor is not damaged by flying stones or the like.

More specifically, the engine cover structure of the present invention includes:
A cover member covering the end of the engine;
A rotor disposed outside the cover member and rotating integrally with the crankshaft;
A rotating body arranged coaxially with the rotor and on which an accessory driving belt is hung,
A sensor that is installed on an outer wall surface of the cover member and detects an angle of the crankshaft through the rotor;
An oil filter attached to the outer wall surface in the vicinity of the joint portion of the cover member with the oil pan;
The engine and the oil filter are disposed outside a plane surrounded by the accessory driving belt that is hung on the rotating body , and the sensor is disposed on the cylinder head side of the oil filter. A member structure,
The sensor installation part for fixing the sensor to the outer wall surface of the cover member is
Formed with a protruding shape protruding outside the cover member, and a holding through-hole for holding the sensor provided in the protruding shape,
A protruding wall shape protruding from the lower end of the oil filter to at least the upper and lower boundary lines of the oil filter is provided between the oil filter and the rotor. And

  In the engine cover structure of the present invention, a rib with a protruding wall shape extends from the lower end of the oil filter arranged in the vicinity of the rotor toward the sensor. To prevent. Further, the protruding wall shape for covering the stepping stone has an effect of improving the strength of the sensor installation portion. Further, since the protruding wall shape is formed from the lower end of the oil filter, it has an effect of preventing the oil from being scattered on the V belt when the oil filter is replaced.

  The engine cover structure of the present invention has a protruding wall shape that can serve both as a function to protect the angle sensor disposed on the outer wall of the cover member and to prevent oil from scattering from the oil filter. Can contribute to lower costs.

It is a figure which shows the front surface of the engine cover which has a sensor installation part which concerns on this invention. FIG. 2 is a partially enlarged view of FIG. 1. It is a figure explaining the sensor installation part periphery which concerns on this invention. It is a figure explaining the sensor installation part periphery which concerns on this invention. It is a figure which shows the AA cross section of FIG.

  The present invention will be described below with reference to the drawings. The following description exemplifies an embodiment of the present invention, and the following embodiment may be modified without departing from the gist of the present invention.

  FIG. 1 shows a front view of an engine having an engine cover structure 1 of the present invention. In the present specification, the “front surface of the engine” refers to a side on which the driving pulley 16 that drives the V-belt 18 is disposed when the engine is viewed from the direction of the crankshaft 12. The engine having the engine cover structure 1 of the present invention includes an oil pan 50, a cylinder block 52 coupled on the oil pan 50, a cylinder head 54 coupled on the cylinder block 52, and a head cover 56 that covers the upper surface of the cylinder head 54. Have

  The cover member 10 is a member that covers at least the cylinder block 52. A chain that transmits rotational power from the crankshaft 12 to the camshaft drive gear disposed on the front surface of the cylinder block 52 is disposed inside the cover member 10 (not visible in the figure). Therefore, the cover member 10 is also a chain cover.

  The cover member 10 is provided with a through hole 14 (see FIG. 5) through which the crankshaft 12 passes, and the shaft end of the crankshaft 12 is exposed. In the cover member 10, the side where the camshaft drive gear exists is called “inside the cover member 10”, and the opposite side is called “outside the cover member 10”. The outer surface of the cover member 10 is an “outer wall surface”. It can be said that the shaft end of the crankshaft 12 protrudes outside the cover member 10.

  A rotor 21 for detecting the angle of the crankshaft 12 is attached to the crankshaft 12 protruding outside the cover member 10. Further, a rotating body 16 is inserted outside thereof. The rotating body 16 is a drive pulley, and a V-belt 18 that drives an AC generator (not shown) and a drive pulley 17 of a water pump is hung thereon. A device driven by the V belt 18 is called an auxiliary machine. Therefore, the V belt 18 is an auxiliary machine driving belt.

  The rotor 21 has a metal gear shape and has a slightly larger diameter than the rotor 16. This is because the V belt 18 is hung on the rotating body 16 but the V belt 18 does not contact the angle sensor 22.

  A sensor installation portion 20 for fixing the angle sensor 22 to the outer wall surface of the cover member 10 is provided obliquely above the rotating body 16. Since the angle sensor 22 often uses a magnetic force that varies depending on the distance between the peaks and valleys formed in the rotor 21, the distance between the rotor 21 and the angle sensor 22 needs to be determined accurately. Therefore, the outer wall surface of the cover member 10 is suitable for the installation position of the sensor installation unit 20. Moreover, if it is on the outer wall surface of the cover member 10, the upper half side of the rotary body 16 which is a position far from the ground with little influence of flying stones or the like is more preferable.

  The sensor installation portion 20 is formed by providing a holding through hole 25 for holding the angle sensor 22 in a protruding shape protruding outward from the outer wall surface of the cover member 10. This is called a sensor protrusion shape 24. After being inserted into the holding through hole 25, the angle sensor 22 is fastened and fixed by a bolt screwed from a fastening bolt hole (not shown) in the vicinity of the holding through hole 25.

  FIG. 5 shows an AA cross section of FIG. A V-groove 16m is formed on the outer periphery of the rotating body 16, and a V-belt 18 is suspended. The angle sensor 22 is held with a slight angle with respect to the outer wall surface of the cover member 10. The circumferential end portion 21e of the rotor 21 is given an elevation angle so that the end surface faces the sensor surface 22f of the angle sensor 22. The holding through hole 25 of the sensor projection shape 24 is formed so that the sensor surface 22f of the angle sensor 22 has an angle with the position of FIG.

  Referring to FIG. 1 again, the cover member 10 is provided with an oil filter 40. Since it is necessary to replace the oil filter 40 according to the travel distance, it is preferable to install the oil filter 40 in a place where it can be easily replaced. The side of the engine, which is formed at a substantially right angle to the cover member 10, is densely packed with intake and exhaust system parts such as an intake manifold (not shown) and an exhaust manifold (not shown). Because there is.

  The oil filter 40 is disposed before oil is supplied to each part of the engine from an oil pump (not shown), and removes fine foreign matters in the oil. Therefore, when the oil filter 40 is replaced, the oil may leak from the oil filter mounting seat (not shown) or the oil may be scattered around. Therefore, the oil filter 40 is preferably disposed as low as possible (on the oil pan 50 side).

  Further, the oil filter 40 and the angle sensor 22 are arranged outside the plane surrounded by the V belt 18. The plane surrounded by the V-belt 18 is the inner side 18i of the V-belt 18 that is a closed ring, and refers to the outer wall surface of the cover member 10. If the angle sensor 22 and the oil filter 40 are disposed inside the V-belt 18, the V-belt 18 becomes an obstacle when replacing these components. Further, when the oil filter 40 is disposed inside the V belt 18, oil is easily scattered on the V belt 18 when the oil filter 40 is replaced.

  Further, if the oil filter 40 can be disposed sufficiently separated from the rotating body 16, there is no need to worry about oil scattering to the V belt 18. However, such conditions hinder downsizing of the engine. Therefore, the oil filter 40 is located at a position where the rotor 21 does not interfere even when the component tolerance and the installation tolerance are worst, and at a position where the sealing performance of the oil passage formed inside the cover member 10 is established. Be placed.

  The oil filter 40 is disposed closer to the oil pan 50 than the angle sensor 22. This is because it is necessary to dispose the protruding wall shape 42 for preventing falling stones, which will also be used as an oil receiver, which will be described later, below the angle sensor 22. In other words, it can be said that the angle sensor 22 is disposed closer to the cylinder head 54 than the oil filter 40.

  On the other hand, the oil pump that sends oil to the oil filter 40 sucks oil from the oil pan 50, and is therefore disposed inside the cover member 10 close to the oil pan 50. Therefore, the oil filter 40 is also disposed on the cover member 10 close to the oil pan 50. That is, it can be said that the oil filter 40 is attached to the outer wall surface in the vicinity of the joint portion between the cover member 10 and the oil pan 50.

  In the engine cover structure 1 of the present invention, a protruding wall shape 42 that protrudes outward from the outer wall of the cover member 10 is formed from below the oil filter 40 toward the angle sensor 22. That is, the protruding wall shape 42 is formed between the oil filter 40 and the rotor 21. The protruding wall shape 42 is preferably formed at the same time as the cover member 10 is formed. This is because when the cover member 10 is formed at the same time, the protruding wall shape 42 can be formed with an increase of only a few grams of raw materials. Further, when formed at the same time, the protruding wall shape 42 becomes a part of the cover member 10 and contributes to improvement of the rigidity of the cover member 10.

  FIG. 2 shows a partially enlarged view of FIG. The protruding wall shape 42 is formed between the oil filter 40 and the rotor 21 from the lower end 40 d of the oil filter 40. Here, the lower end 40 d of the oil filter 40 is a point on the cover member 10 that does not contact the oil filter 40 under the gravity when viewed from the center 40 c of the oil filter 40.

  If the engine is tilted when it is attached to the vehicle body, it may be under gravity in consideration of the tilt. This is because the protruding wall shape 42 is provided in order to prevent oil leakage from the oil filter 40 from scattering to the rotor 21 side. Further, if the protruding wall shape 42 comes into contact with the oil filter 40, the oil filter 40 cannot be attached.

  Moreover, if it is too close to the junction part (flange 10f) of the cover member 10 and the oil pan 50, workability | operativity, such as bolt fastening, will fall. Therefore, the lower end 40d is a point on the cover member 10 below the gravity 40 from the center 40c of the oil filter 40, and a portion where the workability of attachment of the oil filter 40 and joining of the cover member 10 and the oil pan 50 is not deteriorated appropriately. You can decide.

  The protruding wall shape 42 is formed on the side close to the rotor 21 from the lower end 40d of the oil filter 40 to the upper and lower boundary lines 40h of the oil filter 40 along the shape of the oil filter 40. The upper and lower boundary line 40h of the oil filter 40 is a direction (indicated by a two-dot chain line) perpendicular to the above-described direction of gravity at the center 40c of the oil filter 40. This is formed along the direction in which the rotating body 16 rotates. This is to prevent stepping stones from hitting the angle sensor 22.

  More preferably, the protruding wall shape 42 may have an extending portion 42e extending in the direction of the angle sensor 22 beyond the upper and lower boundary line 40h. This is because the protruding wall shape 42 also has a role of preventing the stepping stones from colliding with the angle sensor 22 and is therefore preferably extended as close to the angle sensor 22 as possible. The extending portion 42e may be extended as appropriate to the sensor protrusion shape 24, or may be extended until it contacts the sensor protrusion shape 24.

  The protruding wall shape 42 is formed with a distance that does not contact the rotor 21. Further, the height of the protruding wall shape 42 is preferably formed from the outer wall surface of the cover member 10 to the height surface of the V-belt 18 (see reference numeral 18t in FIG. 5) or higher. This is because the protruding wall shape 42 is provided in order to prevent oil from scattering to the V-belt 18.

  An inclined shape 44 that is inclined downward from the lower end 40d of the protruding wall shape 42 in the direction opposite to the rotor 21 in the direction of gravity may be formed continuously with the protruding wall shape 42. This is because when oil leaks from the mounting portion of the oil filter 40, the oil flows through the inclined shape 44 and can be guided to a desired place.

  If oil adheres to the connecting portion 51 between the cover member 10 and the oil pan 50, it may be mistaken for oil bleeding from the oil pan 50. Oil bleeding from the oil pan 50 is suspected of oil leakage from the oil pan 50 and requires extensive repair. Therefore, the oil leakage from the oil filter 40 needs to be guided to a location where the oil filter 40 does not adhere to the connecting portion 51 between the cover member 10 and the oil pan 50.

  Specifically, as a specific example in which oil is not attached to the coupling portion 51, in FIG. 2, a structure in which the oil dropping member 46 connected to the flange 10 f of the cover member 10 is arranged below the inclined shape 44 is arranged. Show. The oil drop member 46 has an inclined surface 46s and a semicircular cutout 46c on the lower side. The oil that has fallen on the inclined surface 46s from the tip of the inclined shape 44 flows along the inclined surface 46s and falls downward at the end point of the inclined surface 46s. The semicircular cutout portion 46 c is a cutout for preventing oil from flowing into the coupling portion 51 along the lower side of the oil dropping member 46.

Referring to FIG. 3, a rib shape 26 for protecting the angle sensor from a flying stone or the like is extended in the sensor projection shape 24. The rib shape 26 is formed in the circumferential direction of a circle whose radius is the distance r ₀ from the center of the crankshaft to the sensor projection shape 24. In FIG. 3, the circumferential direction is indicated by an arrow 27. The distance r ₁ from the center of the crankshaft 12 is shorter than the distance r ₀ to the sensor projection shape 24 at the tip 26t in the extending direction of the rib shape 26. That is, the rib shape 26 extends in the circumferential direction 27 so as to be close to the rotor 21 from the sensor projection shape 24.

  The height of the rib shape 26 is equal to or lower than that of the sensor projection shape 24. This is because if the height is higher than the sensor protrusion shape 24, the strength of the rib shape 26 is reduced, and the rib shape 26 itself may be damaged when hit with a stepping stone or the like. The tip 26t of the rib shape 26 is such that it does not come into contact with the rotating body 16, the V belt 18 or the rotor 21, and the predicted flying stone does not collide with the angle sensor 22 (especially the sensor surface 22f shown in FIG. 5). What is necessary is just to form so that the clearance gap 28 can be provided between the rotary bodies 16. FIG.

  The rib shape 26 arranged in this way is arranged as an obstacle that narrows the gap 28 between the sensor projection shape 24 and the rotating body 16. That is, stepping stones are blocked by the rotating body 16 and the rib shape 26 and do not reach the tip of the angle sensor 22. In FIG. 3, the rib shape 26 is formed in one direction, but the rib shape 26a may be formed in the opposite direction. The rib shape 26a is indicated by a two-dot chain line.

  Referring to FIG. 4, a protrusion shape other than the sensor protrusion shape 24 may be formed in the vicinity of the sensor installation portion 20. Such a protrusion shape is referred to as a near protrusion shape 30. The adjacent protrusion shape 30 has an effect of strengthening the sensor protrusion shape 24. The angle sensor 22 detects the angle of the crankshaft 12 by detecting the strength of magnetic coupling due to the uneven shape provided at the periphery of the rotor 21.

  Therefore, the distance between the tip of the angle sensor 22 and the rotor peripheral end 21e of the rotor 21 needs to be as close as possible, and the distance must be stably maintained. Therefore, the positional accuracy of the sensor projection shape 24 needs to be strong against disturbances such as vibration and heat shock. Forming the proximate protrusion shape 30 in the vicinity of the sensor protrusion shape 24 leads to an improvement in the strength of the sensor protrusion shape 24.

A rib shape 32 can also be formed in the protrusive protrusion shape 30. In FIG. 4, a rib shape 32 extending from the adjacent protrusion shape 30 in the same direction as the rib shape 26 provided in the sensor protrusion shape 24 is shown. The ribs 32 are also extended toward the center of the crank shaft 12 to the circumference of the circumferential direction of the distance r ₃ to the near設突raised shape 30 and the radius (arrow 33).

Further, a distance r ₃ from the center of the crankshaft 12 to the tip 32 t of the rib shape 32 is formed shorter than a distance r ₂ from the center of the crankshaft to the adjacent protrusion shape 30. That is, the rib shape 32 extending from the adjacent protrusion shape 30 is also extended in the circumferential direction 33 so as to be close to the rotating body 16 from the adjacent protrusion shape 30.

  The height of the rib shape 32 of the adjacent protrusion shape 30 is the same as the height of the rib shape 26 of the sensor protrusion shape 24, and is preferably equal to or lower than the height of the adjacent protrusion shape 30. Also, the extended length of the rib shape 32 is such that the tip 32t does not contact the rotating body 16, the V belt 18 or the rotor 21, and the predicted stepping stone is the angle sensor 22 (particularly in FIG. 5). What is necessary is just to form so that the clearance gap which does not collide with the sensor surface 22f) shown can be provided between the rotary bodies 16. FIG.

  As described above, the engine cover structure 1 of the present invention can safely arrange the rotor 21 and the angle sensor 22 for detecting the angle of the crankshaft 12 on the outer wall surface of the engine. Therefore, since the interval between the angle sensor 22 and the rotor 21 can be visually confirmed, the distance between the rotor 21 and the angle sensor 22 can be arranged close to each other. Further, the angle sensor 22 can be easily replaced.

  The cover structure of the present invention can be suitably used for an engine in which the camshaft is driven by a chain, and is also suitable when an angle sensor that detects the angle of the crankshaft is exposed on the outer wall of the engine. Can be used.

DESCRIPTION OF SYMBOLS 1 Engine cover structure 10 Cover member 10f Flange of cover member 12 Crankshaft 14 Through-hole (of cover member from which crankshaft protrudes) 16 Rotating body 16m V groove 17 Drive pulley of water pump 18 V belt 18i Plane surrounded by V belt 18t Height surface of V-belt 20 Sensor installation portion 21 Rotor 21e Rotor peripheral end portion 22 Angle sensor 22f Sensor surface (of angle sensor) 24 Sensor projection shape 25 Holding through hole 26 Rib shape (sensor projection shape) 26a Rib shape (installed in the opposite direction) 26t Tip end of rib shape extending direction 27 Circumferential direction 28, 29 Gap 30 Protrusion shape 32 (Rear shape of near protrusion) 32t Rib shape of near protrusion shape Tip of 33 33 circumferential direction 40 oil filter 40c center of oil filter 40d oil Lower end of filter 40h Upper and lower boundary lines of oil filter 42 Protruding wall shape 42e Extending portion of protruding wall shape 44 Inclined shape 46 Oil dropping member 46c Semi-circular cutout 46s Inclined surface 50 Oil pan 51 Cover member and oil pan 52 Cylinder block 54 Cylinder head 56 Head cover

Claims (1)

A cover member covering the end of the engine;
A rotor disposed outside the cover member and rotating integrally with the crankshaft;
A rotating body arranged coaxially with the rotor and on which an accessory driving belt is hung,
A sensor that is installed on an outer wall surface of the cover member and detects an angle of the crankshaft through the rotor;
An oil filter attached to the outer wall surface in the vicinity of the joint portion of the cover member with the oil pan;
The engine and the oil filter are disposed outside a plane surrounded by the accessory driving belt that is hung on the rotating body , and the sensor is disposed on the cylinder head side of the oil filter. A member structure,
The sensor installation part for fixing the sensor to the outer wall surface of the cover member is
Formed with a protruding shape protruding outside the cover member, and a holding through-hole for holding the sensor provided in the protruding shape,
A protruding wall shape protruding from the lower end of the oil filter to at least the upper and lower boundary lines of the oil filter is provided between the oil filter and the rotor. Engine cover structure.