JP6201662B2 - Internal combustion engine and internal combustion engine cover mounting structure - Google Patents

Description

  The present invention relates to an internal combustion engine and a cover mounting structure for an internal combustion engine, and more particularly, to an internal combustion engine including a seal member disposed between an internal combustion engine body and a cover member attached to the side of the internal combustion engine and a cover mounting structure for the internal combustion engine. About.

  2. Description of the Related Art Conventionally, an internal combustion engine including a seal member disposed between an internal combustion engine body and a cover member attached to the internal combustion engine body is known (see, for example, Patent Document 1).

  The above Patent Document 1 is an internal combustion engine including a cylinder head having an opening that opens upward, and a cam cover (cover member) that is attached to the cylinder head so as to cover the opening of the cylinder head from above. A sealing structure is disclosed in which a gasket (seal member) is disposed between the opening end surface of the cylinder head and the outer edge of the cam cover. In the sealed structure in the internal combustion engine described in Patent Document 1, the cam cover is overlapped with the cylinder head in a state in which the root portion of the gasket is fitted in the groove portion formed along the outer edge portion of the cam cover. The exposed end portion (seal portion) of the gasket is brought into contact with the opening end surface of the cylinder head. Thereby, it is comprised so that a clearance gap may not arise between the opening end surface of the cylinder head which opposes an up-down direction, and the outer edge part of a cam cover.

JP 2010-249270 A

  In the sealed structure in the internal combustion engine described in Patent Document 1, since the gasket is sandwiched between the opening end surface of the cylinder head facing the vertical direction and the outer edge of the cam cover, the gasket is positioned even when the cylinder head vibrates. Does not cause a shift.

  However, for example, when the opening formed in the vertical surface (side wall) extending in the vertical direction of the cylinder head (internal combustion engine body) is closed from the side by using a cover member, the horizontal direction (internal combustion engine body) Since the seal member is sandwiched between the opening end surface of the internal combustion engine body facing the side of the engine and the outer edge of the cover member, the seal portion of the seal member is displaced downward due to vibration of the internal combustion engine body. There is a possibility of moving.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to provide an internal combustion engine body and a cover member even when the cover member is attached to the side of the internal combustion engine body. An internal combustion engine and a cover mounting structure for the internal combustion engine that can sufficiently ensure a sealing property between the internal combustion engine and the internal combustion engine.

  In order to achieve the above object, an internal combustion engine according to a first aspect of the present invention includes a cover member attached to a side of an internal combustion engine body so as to cover a valve train timing member using lubricating oil of the internal combustion engine body, A seal member that is disposed between the internal combustion engine body and the cover member and includes a seal portion that contacts the seal surface of the internal combustion engine body, and at least a part of the seal portion receives a reaction force received from the seal surface of the internal combustion engine body Among them, the reaction force component in the upward direction opposite to the direction in which the gravity works is larger than the reaction force component in the downward direction in which the gravity works.

  In the internal combustion engine according to the first aspect of the present invention, as described above, the internal combustion engine includes a seal member that is disposed between the internal combustion engine body and the cover member and includes a seal portion that contacts the seal surface of the internal combustion engine body. At least a part of the reaction force received from the sealing surface of the internal combustion engine body has a larger reaction force component directed upward than the direction in which gravity acts than the force component directed downward in which gravity acts. Even when the opening formed in the vertical surface (side wall) extending in the vertical direction of the internal combustion engine body is closed from the side with the cover member facing horizontally, The seal member includes a seal portion having a shape such that the reaction force component directed upward from the reaction force component directed downward from which the gravity acts is larger than the reaction force received from the seal surface. The seal portion also moves downward in the direction of gravity even in a portion of the seal surface where the seal member is displaced due to the vibration of the internal combustion engine body or the weight of the cover member (seal region) where the seal performance is likely to be reduced (seal region) ( (Sliding down) is prevented. That is, the sealing portion can be continuously arranged at a position where the sealing performance is maintained with respect to the sealing surface of the internal combustion engine body. Thereby, even if it is a case where a cover member is attached to the side of an internal-combustion engine body, the seal nature between an internal-combustion engine body and a cover member can fully be secured.

  In the internal combustion engine according to the first aspect, preferably, when the seal member is elastically deformed in a state where the cover member is attached to the side of the internal combustion engine body via the seal member, the seal surface of the internal combustion engine body At least a part of the seal portion is configured to be deformed so that the reaction force component directed upward is larger than the reaction force component directed downward received. With this configuration, when the seal member is crushed into a predetermined shape with elastic deformation on the seal surface, the reaction force component directed upward is lower than the reaction force component directed downward from the seal surface of the internal combustion engine body. Since the seal portion can be deformed so as to increase the force component, the seal portion can be easily prevented from shifting (sliding down) in the downward direction of gravity.

  In the internal combustion engine according to the first aspect, preferably, the shape of the seal portion is a serrated uneven shape asymmetric with respect to the normal to the seal surface of the internal combustion engine body, or the seal surface of the internal combustion engine body. A shape having slits extending in the intersecting direction is included. If comprised in this way, the seal | sticker part in which the reaction force component which goes upwards rather than the reaction force component going to the downward direction where gravity acts among the reaction forces received from the sealing surface of an internal combustion engine main body will be easily provided in a seal member be able to.

  In this case, it is preferable that each saw-tooth portion of the seal portion having the asymmetric saw-tooth uneven shape has a cross-sectional shape in which the amount projecting toward the internal combustion engine body increases toward the lower end portion. If comprised in this way, in each sawtooth part of a seal | sticker part, the reaction received from the sealing surface of an internal combustion engine main body using the cross-sectional shape which the amount projected to the internal combustion engine main body side will increase as it goes to a lower end part. Of the force, the reaction force component directed upward can be easily increased more than the reaction force component directed downward where gravity acts.

  In the configuration in which the shape of the seal portion includes a serrated uneven shape or a shape having a slit, preferably, the serrated uneven shape or the shape having a slit extends in a direction intersecting with a downward direction in which gravity acts. The seal portion of the seal member includes a first seal portion extending in the vertical direction and a second seal portion extending in a direction crossing the vertical direction, and gravity is applied to at least a part of the second seal portion. A serrated uneven shape or a shape having a slit extending in a direction crossing the working downward direction is provided. If configured in this way, when a serrated uneven shape or a shape having a slit extending in a direction intersecting with the lower direction in which the gravity acts is formed in the second seal portion extending in the direction intersecting with the vertical direction, the gravity is reduced. Unlike the case where a serrated uneven shape extending in a direction intersecting with the working downward direction or a shape having a slit is formed in the first seal portion extending in the vertical direction (downward direction where gravity acts), the lubricating oil has a serrated uneven shape. Alternatively, since there is no leakage through the shape having the slit, it is possible to effectively prevent the seal member (second seal portion) from sliding downward from the seal region while ensuring the sealability of the entire seal region. be able to.

  In the internal combustion engine according to the first aspect, preferably, the reaction force component directed upward is larger than the reaction force component directed downward from the seal surface of the internal combustion engine body in the seal portion of the seal member. The portion where the shape is provided has a larger seal width than the portion where the shape is not provided. With this configuration, the length (seal width) of the seal portion for preventing the downward sliding of the gravity can be increased, and accordingly, the seal member is reduced in gravity on the seal surface of the internal combustion engine body. It is possible to effectively suppress (prevent) the downward shifting (sliding down).

  In the internal combustion engine according to the first aspect, preferably, the cover member includes an attachment portion attached to the internal combustion engine body, and the attachment portion of the cover member has a predetermined attachment height with respect to the internal combustion engine body via the seal member. In a state of being separated from each other, it is attached to the internal combustion engine body by a fastening member capable of maintaining a predetermined mounting height. If comprised in this way, using the fastening member which can maintain predetermined | prescribed mounting height (separation space | interval of the attaching part of a cover member and an internal combustion engine main body), maintaining the separation space | interval of a cover member with respect to an internal combustion engine main body appropriately. In this state, it is possible to dispose the crushed seal member in an optimal shape in the gap between the internal combustion engine body and the cover member. That is, since the seal member is arranged without causing the crushing margin to be insufficient or excessive, the reaction force received from the seal surface of the internal combustion engine main body is higher than the reaction force component directed downward in the direction of gravity. The seal member (seal part) can be maintained in an optimum shape in which the reaction force component toward it increases.

  In the internal combustion engine according to the first aspect, preferably, the attachment surface of the cover member to the internal combustion engine main body is formed in a circumferential shape on the same plane, and the seal member is provided on the same planar attachment surface of the cover member. Is arranged. With this configuration, since the mounting surface of the cover member with respect to the internal combustion engine body can be suppressed to a single surface, the cover member can be kept in a simple shape as compared to the case where there are a plurality of mounting surfaces on the cover member. It is possible to obtain a cover member that achieves both weight reduction (weight reduction) and rigidity securing. Further, since the parallelism and flatness of the mounting surface can be kept appropriate as much as the rigidity of the cover member is obtained, the sealing performance when the cover member is attached to the internal combustion engine body using the seal member of the present invention is improved. Can be kept high.

  In the configuration in which the mounting surface of the cover member with respect to the internal combustion engine main body is formed in a circumferential shape in the same plane, preferably, the mounting surface in the same plane is continuously formed in a circumferential shape along the outer peripheral portion of the cover member. Has been. If comprised in this way, since the same planar attachment surface will be continuously provided along the outer peripheral part of a cover member, it will be equal, without making the fastening force with respect to an internal combustion engine main body unevenly distributed with respect to a cover member. Can be added. That is, since the pressing force of the seal portion against the seal surface of the internal combustion engine body is uniformly applied along the outer peripheral portion of the cover member, the durability of the seal member is ensured and the seal between the internal combustion engine body and the cover member is secured. Sex can be secured for a long time.

  In the configuration in which the same planar mounting surface is continuously formed along the outer peripheral portion of the cover member, preferably, the cover member is a flange provided circumferentially along the outer peripheral portion of the cover member. The attachment surface of the same plane shape is formed in the flange-shaped part. If comprised in this way, the attachment surface which becomes the same planar shape and circumferential shape can be easily provided in a cover member.

  In this case, it is preferable that the flange-like portion on which the same planar mounting surface is formed is provided in a circumferential shape so as to surround the valve timing system timing member. If comprised in this way, the same planar attachment surface of the cover member with respect to an internal combustion engine main body can be arrange | positioned in the part outside the valve operating system timing member driven by the lubricating oil of an internal combustion engine main body being supplied. Therefore, it is easy to avoid that the lubricating oil splashing to the inner region of the cover member due to the operation of the valve timing member leaks outside the internal combustion engine body beyond the seal surface with the cover member. Can do.

  In the internal combustion engine according to the first aspect, the cover member is preferably made of resin. If comprised in this way, since the high sealing performance is ensured in sealing member itself, a cover member is comprised using a resin material for the purpose of weight reduction (weight reduction) of components, and a resin-made cover member is used. Even when attached to the internal combustion engine body, high sealing performance can be realized between the internal combustion engine body and the cover member. Therefore, it is possible to easily reduce the weight of the internal combustion engine while ensuring high sealing performance against leakage of the lubricating oil to the outside.

  An internal combustion engine cover mounting structure according to a second aspect of the present invention includes a cover member that is attached to a side of an internal combustion engine body so as to cover a valve operating timing member that uses lubricating oil of the internal combustion engine body, and an internal combustion engine body. And a seal member that includes a seal portion that is in contact with the seal surface of the internal combustion engine body, wherein at least a portion of the seal portion is subjected to gravity out of a reaction force received from the seal surface of the internal combustion engine body. It has a shape such that the reaction force component in the upward direction opposite to the direction in which gravity works is larger than the reaction force component in the downward direction that is the working direction.

  In the cover mounting structure for an internal combustion engine according to the second aspect of the present invention, as described above, the seal member including the seal portion disposed between the internal combustion engine body and the cover member and contacting the seal surface of the internal combustion engine body. And at least a part of the seal portion has a reaction force directed in an upward direction opposite to the direction in which the gravity acts rather than a reaction force component in the downward direction, which is the direction in which the gravity acts, out of the reaction force received from the seal surface of the internal combustion engine body. Even when the opening formed in the vertical surface (side wall) extending in the vertical direction of the internal combustion engine body is closed from the side with the cover member facing in the horizontal direction by having a shape that increases the force component The seal portion having a shape in which the reaction force component directed upward is greater than the reaction component directed downward of the gravity acting among the reaction force received from the seal surface of the internal combustion engine body is a seal member As a result, the seal part is under gravity even at locations where the seal member is likely to be displaced due to vibration of the internal combustion engine body or the weight of the cover member (seal area). It is prevented from moving in the direction (sliding down). That is, the sealing portion can be continuously arranged at a position where the sealing performance is maintained with respect to the sealing surface of the internal combustion engine body. Thereby, even if it is a case where a cover member is attached to the side of an internal-combustion engine body, the seal nature between an internal-combustion engine body and a cover member can fully be secured.

  In the present application, the following configuration is also conceivable in the internal combustion engine according to the first aspect.

(Additional notes)
That is, in the internal combustion engine according to the first aspect, the shape of the seal portion is formed from one end portion to the other end portion in the width direction of the seal portion. If comprised in this way, not only a part of seal part but the whole area | region along the width direction of a seal part will keep the sealing performance with respect to the sealing surface of an internal combustion engine main body, without shifting | deviating to the downward direction of gravity. Therefore, the sealing property between the internal combustion engine main body and the cover member can be ensured more reliably.

  According to the present invention, as described above, even when the cover member is attached to the side of the internal combustion engine body, the internal combustion engine that can sufficiently ensure the sealing performance between the internal combustion engine body and the cover member. In addition, a cover mounting structure for an internal combustion engine can be provided.

1 is an exploded perspective view showing a schematic configuration of an engine according to a first embodiment of the present invention. It is the top view which looked at the timing chain cover single-piece | unit in the engine by 1st Embodiment of this invention from the back side (side attached to an engine main body). It is sectional drawing of the timing chain cover in the engine by 1st Embodiment of this invention. It is a figure for demonstrating the cross-section of the sealing member used in the engine by 1st Embodiment of this invention. It is a figure for demonstrating the cross-section of the sealing member used in the engine by 1st Embodiment of this invention. It is the expanded sectional view showing the state where the timing chain cover was attached via the seal member in the engine by a 1st embodiment of the present invention. It is the figure which showed the state of the force which acts internally in the state which the front-end | tip part of the sealing member shown in FIG. 6 deform | transformed. It is the enlarged plan view which showed the sealing member used in the engine by 2nd Embodiment of this invention. It is the expanded sectional view showing the state where the timing chain cover was attached via the seal member in the engine by a 2nd embodiment of the present invention. It is a figure for demonstrating the cross-section of the sealing member used in the engine by 3rd Embodiment of this invention. It is the expanded sectional view showing the state where the timing chain cover was attached via the seal member in the engine by a 3rd embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, the configuration of the engine 100 according to the first embodiment of the present invention will be described with reference to FIGS. In the following description, the direction in which the crankshaft 40 extends is defined as the X direction, the direction orthogonal to the crankshaft 40 in the horizontal plane is defined as the Y direction, and the direction in which the cylinder 3a extends is defined as the Z direction (vertical direction). Further, the XY plane is a horizontal plane.

  As shown in FIG. 1, an automobile engine 100 according to the first embodiment of the present invention includes an aluminum alloy engine body 10 including a cam cover 1, a cylinder head 2, a cylinder block 3, and a crankcase 4. An engine 100 including a gasoline engine is attached to a side end portion 10a on the X2 side of the engine body 10 and is made of a resin timing chain cover 20 (hereinafter referred to as TCC 20) that covers the timing chain 5 and its periphery, and a cylinder. A resin head cover 30 is provided on the upper side (Z1 side) of the head 2 via the cam cover 1. The engine 100 is an example of the “internal combustion engine” of the present invention, and the engine body 10 is an example of the “internal combustion engine body” of the present invention. The timing chain cover (TCC) 20 is an example of the “cover member” in the present invention.

  A camshaft 6 and a valve mechanism (not shown) are disposed above the cylinder head 2. A cylinder 3a (shown by a broken line) in which a piston (not shown) reciprocates in the Z direction is formed inside the cylinder block 3 connected to the lower side (Z2 side) of the cylinder head 2. The cylinder head 2 is connected to an intake device (not shown) that introduces intake air into each of a plurality (four) of cylinders 3 a formed in the cylinder block 3. In addition, a crankshaft 40 that is rotatably connected via a piston and a connecting rod is disposed inside the crankcase 4 that is connected to the lower side (Z2 side) of the cylinder block 3. In FIG. 1, the crankshaft 40 is illustrated in a substantially rod shape. However, in actuality, the crankshaft 40 has a balance between the crankpin with the rotating shaft being eccentric and the crankpin sandwiched immediately below each cylinder 3a. A weight is connected to the crank journal to form an integral structure.

  An oil reservoir 4a for accumulating engine oil (hereinafter simply referred to as oil) is provided at the lower portion (Z2 side) of the crankcase 4. The oil is pumped up from the oil reservoir 4a to the upper portion of the engine body 10 by an oil pump (not shown) and lubricates sliding portions such as the camshaft 6 and the outer peripheral surface of the piston, and then drops by its own weight to the oil reservoir 4a. Returned. Oil (engine oil) is an example of the “lubricating oil” in the present invention.

  The engine body 10 has an opening 11. The opening 11 is formed in a rectangular shape with the Z direction being the longitudinal direction and the Y direction being the short direction, and is formed at the side end 10a from the cam cover 1 on the Z1 side to the crankcase 4 on the Z2 side. Has been. Further, the side end portion 10 a has a mounting portion 10 b formed in a circumferential shape along the outer edge portion of the opening 11. The mounting portion 10b has a seal surface 10c formed from the cam cover 1 to the crankcase 4 in the same plane and in a circumferential shape.

  Inside the engine body 10 in the vicinity of the opening 11, a crankshaft timing sprocket 41 attached to the crankshaft 40 and a camshaft timing sprocket 42 for driving the camshaft 6 incorporated inside the cam cover 1 are provided. Are connected by a timing chain 5. The timing chain 5, the camshaft 6, the crankshaft timing sprocket 41, and the camshaft timing sprocket 42 are examples of the “valve system timing member” in the present invention.

  The TCC 20 includes a concave main body portion 21 formed so as to overlap the planar shape of the side end portion 10 a of the engine main body 10, and a mounting portion 22 formed in a circumferential shape and a flange shape along the outer peripheral portion of the main body portion 21. Including. The main body portion 21 includes a bottom surface portion 21a that extends in the YZ plane, and a frame-shaped side wall portion 21b that extends from the bottom surface portion 21a in the X1 direction and surrounds the bottom surface portion 21a. And the flange-shaped attachment part 22 is provided so that it may spread in the outer side direction of the main-body part 21 from the edge part on the opposite side to the bottom face part 21a of the side wall part 21b. The mounting portion 22 has a flat mounting surface 22a formed in a circumferential shape, and the mounting portion 22 has a plurality of through holes 22b penetrating the mounting surface 22a in the thickness direction at a predetermined interval. Is provided. The through hole 22b is provided at one or two places between the four corners of the attachment portion 22 and the adjacent corners. The attachment portion 22 is an example of the “flange-shaped portion” in the present invention.

  When the TCC 20 is viewed from the back side (the side on which the engine body 10 (see FIG. 1) is attached) in the direction of the arrow X2, the attachment surface 22a of the attachment portion 22 has 1 along the attachment portion 22 as shown in FIG. An annular groove 22c is formed. The groove 22c has a two-step groove width in the depth direction (X direction), and a base 51 (see FIG. 4) side of a seal member 50 (see FIG. 4) to be described later is fitted into the groove 22c. It is configured.

  On the lower side (Z2 side) of the main body portion 21 and in the vicinity of the center portion in the Y direction, a boss portion 23 that penetrates the bottom surface portion 21a is formed. An oil seal 7 is press-fitted into the inner peripheral surface 23 a of the boss portion 23. The oil seal 7 is slidably in contact with the outer peripheral surface of the crankshaft 40 (see FIG. 1). Further, the oil seal 7 prevents the oil in the crankcase 4 (see FIG. 1) from leaking out of the engine body 10 (see FIG. 1) along the outer peripheral surface of the crankshaft 40.

  Here, in the first embodiment, as shown in FIG. 1, the circumferential mounting portion 22 is mounted in a circumferential manner with the front end portion 40 a on the X2 side of the crankshaft 40 inserted through the boss portion 23 of the TCC 20. The TCC 20 is configured to be attached to the engine body 10 so as to face the portion 10b in the X direction.

  Specifically, the mounting portion 10b (seal surface 10c) of the engine body 10 is provided with a plurality of fixing holes 10d (for example, screw holes) so as to correspond to the formation positions and formation intervals of the through holes 22b of the TCC 20. . Then, the TCC 20 is disposed in the vicinity of the opening portion 11 by tightening the stepped bolt 90 into the fixing hole 10d through the respective through holes 22b with the TCC 20 placed on the opening portion 11 from the front side (X2 side). The timing chain 5 and the camshaft 6 are fixed to the side of the engine body 10 so as to cover the valve system timing members. The stepped bolt 90 is an example of the “fastening member” in the present invention.

  In the first embodiment, the TCC 20 is attached to the side of the engine body 10 with the annular seal member 50 sandwiched therebetween. Below, the attachment structure of TCC20 using the sealing member 50 is demonstrated in detail.

  The seal member 50 is made of a material having elasticity, and as shown in FIGS. 4 and 5, the base member 51 is formed in an annular shape without a joint and has a two-stage width, and the wide portion 51 a of the base portion 51 is extended. The seal part 52a (refer FIG. 4) and the seal part 52b (refer FIG. 5) which were formed integrally are comprised. The seal portion 52a and the seal portion 52b are examples of the “first seal portion” and the “second seal portion” in the present invention, respectively.

  The cross-sectional structure of the seal member 50 is different between the longitudinal direction (up and down direction of the side end portion 10a) and the short direction (horizontal direction) perpendicular thereto. As a cross-sectional structure in the longitudinal direction of the seal member 50, as shown in FIG. 4, a seal portion 52 a having a distal end portion 53 a made of a flat surface is connected to the wide portion 51 a of the base portion 51. Further, a portion protruding from the mounting surface 22a of the TCC 20 is a seal portion 52a, and the seal portion 52a has a width Wa. In FIG. 2, the seal portion 52 a is a portion that is attached corresponding to a region A that extends in the vertical direction on each of the Y1 side and the Y2 side of the mounting surface 22 a of the TCC 20. 4 shows a cross-sectional structure taken along the line 110-110 when the seal member 50 is attached to the groove 22c in the region A extending in the vertical direction in FIG. In addition, the front-end | tip part 53a of the seal | sticker part 52a is an example of the "part in which the shape is not provided" of this invention.

  On the other hand, as shown in FIG. 5, the seal portion 52b connected to the wide portion 51a of the base 51 has a width as a cross-sectional structure in the short direction of the seal member 50 (horizontal direction of the side end portion 10a). A tip portion formed in an uneven shape by continuously repeating a sawtooth shape a plurality of times (four times) from the upper (Z1 side) end to the lower (Z2 side) end in the direction (in this case, the Z direction) 53b. Here, the front end portion 53b is a serrated (a four-tiered saddle-like shape) asymmetrical in the Z direction with respect to the perpendicular L1 (one-dot chain line) of the seal surface 10c of the engine body 10 (indicated by a two-dot chain line). It has a shape. In this case, each saw-tooth part 54b which comprises the front-end | tip part 53b is cross-sectional shape in which the overhang | projection amount D which protrudes to the seal surface 10c side to X1 direction increases as it goes to the lower end part which becomes the Z2 side of the seal | sticker part 52b. Have Further, the distal end portion 53b of the seal portion 52b is constituted by four sawtooth portions 54b extending in parallel and continuously in the horizontal direction while having the cross-sectional shape shown in FIG. Further, the seal portion 52b has a width Wb. In FIG. 2, the seal portion 52 b is a portion that is attached corresponding to a region B that extends in the horizontal direction on each of the Z1 side and the Z2 side of the attachment surface 22 a of the TCC 20. 5 shows a cross-sectional structure taken along line 120-120 when the seal member 50 is attached to the groove 22c in the region B extending in the horizontal direction in FIG. The tip 53b is an example of the “sawtooth uneven shape” of the present invention, and the sawtooth 54b is an example of the “sawtooth portion” of the present invention. The tip 53b of the seal portion 52b is provided with a shape such that the reaction force component directed upward is larger than the reaction force component directed downward from the seal surface of the internal combustion engine body of the present invention. It is an example of “part”. The overhang amount D is an example of the “overhang amount” in the present invention. The four-stage sawtooth portion 54b is an example of the “sawtooth-like uneven shape” of the present invention, and the “sawtooth-like uneven shape” of the distal end portion 53b can be set according to the weight of the TCC 20. That is, the serrated uneven shape uses the upward reaction force received from the seal surface 10c to suppress unintentional downward movement of the TCC 20 or is set to the magnitude of such reaction force. Any shape is possible.

  As a whole, the seal member 50 has a circumferential seal of the engine body 10 facing the TCC 20 via a seal portion 52a (see FIG. 4) and a seal portion 52b (see FIG. 5) protruding from the circumferential mounting surface 22a. It is in contact with the surface 10c. That is, the seal member 50 is disposed between the seal surface 10c of the engine main body 10 and the mounting surface 22a of the TCC 20, and the seal member 50 has the tip 53a when the stepped bolt 90 (see FIG. 1) is tightened. The seal portion 52a including the tip portion 53b and the seal portion 52b including the tip portion 53b are pressed in the X1 direction and are in close contact with the groove portion 22c and the seal surface 10c. In this case, as shown in FIG. 1, the seal portion 52a disposed corresponding to the region A (see FIG. 2) of the TCC 20 (mounting portion 22) is in relation to the seal region 10e of the seal surface 10c extending in the vertical direction. The seal portion 52b disposed in contact with the region B (see FIG. 2) of the TCC 20 (attachment portion 22) contacts the seal region 10f of the seal surface 10c extending in the horizontal direction.

  Here, in the first embodiment, as shown in FIG. 6, the seal portion 52 b having four serrated portions 54 b is crushed in the X1 direction, whereby the seal portion 52 b is separated from the seal surface 10 c of the engine body 10. Among the reaction forces received, the seal surface 10c (in a state in which the reaction force component toward the upward direction opposite to the direction in which the gravity acts is larger than the reaction force component toward the downward direction in which the gravity acts is larger. It is configured to contact the seal area 10f). In other words, when the seal portion 52b is elastically deformed, the seal member 50 is higher in the upward direction than the downward reaction force component received from the seal surface 10c due to the deformation of the tip 53b of the seal portion 52b. It is comprised so that it may be maintained in the shape (shape shown in FIG. 6) which the reaction force component which goes to becomes large. Therefore, in a state where the TCC 20 is fixed to the engine body 10 with the separation distance H1 through the portion of the seal member 50 extending in the short direction (horizontal direction), the seal portion deformed by the fastening force of the stepped bolt 90. 52b is a seal region of the seal surface 10c while maintaining its deformed shape in a state in which a force is applied to the inside so that the tip 53b is always displaced upward (Z1 direction) instead of downward with deformation. 10f is in contact (contact). The separation distance H1 is an example of the “predetermined mounting height” in the present invention.

  Further, when the engine 100 is started in a state where the TCC 20 is fixed to a fixed size by the stepped bolt 90 (see FIG. 6) through the seal member 50 and attached to the engine body 10, the engine body 10 vibrates in small increments. . At this time, the TCC 20 that is floated with the separation distance H1 through the seal member 50 has a small amplitude (vibration width) in the position in the X direction with respect to the engine body 10 as the seal member 50 is elastically deformed. Thus, it is periodically changed (increased or decreased). That is, as shown in FIG. 7, the vibration (fine reciprocation) of the TCC 20 in the X direction repeatedly increases or decreases the force that crushes the seal portion 52b in the X1 direction. The seal portion 52b is repeatedly deformed between a state C1 in which the separation distance H1 is a relatively large moment and a state C2 in which the separation distance H1 is a relatively narrow moment with respect to the state C1. At this time, the seal portion 52b receives a reaction force that periodically increases and decreases from the seal surface 10c.

  Also in this case, since the four serrated portions 54b formed at the distal end portion 53b have a serrated uneven shape that is asymmetric in the Z direction with respect to the perpendicular L1 (one-dot chain line) of the seal surface 10c, A force is exerted on the portion 52b such that a reaction force component directed upward (Z1 direction) is larger than a reaction force component directed downward (Z2 direction) among reaction forces received from the seal surface 10c. Therefore, even when the TCC 20 vibrates in small increments, the force that the tip end portion 53b (four sawtooth portions 54b) is displaced upward always acts on the inside of the crushed seal portion 52b while repeating strength. doing. In other words, the portion of the seal member 50 extending in the short direction (horizontal direction) does not slide down at least downward from the seal surface 10c due to the small vibration of the TCC 20, and the self is always pulled upward. While trying to rise, it keeps its dynamic deformation shape on the seal surface 10c and is in contact with the seal region 10f of the seal surface 10c.

  Thus, in engine 100, regardless of whether the engine 100 is starting or stopping, seal portion 52b extending in the short direction (horizontal direction) of seal member 50 is upward from the corresponding portion of seal surface 10c extending in the horizontal direction. The contact area 10f of the seal surface 10c is in contact with a potential force that tends to shift to the inside.

  In addition, in the seal portion 52a (see FIG. 4) including the tip 53a formed of a flat surface, even if the seal portion 52a is deformed by the fastening force of the stepped bolt 90 (see FIG. 1), the seal portion 52b (see FIG. 6). ) Such a force that shifts upward (Z1 direction) does not act on the inside. Even if the seal region 10e of the seal surface 10c extending in the vertical direction is shifted downward, the sealing direction is maintained because the direction in which the seal portion 52a is displaced and the direction in which the seal surface 10c extends is the same. Further, at the corner of the seal member 50, the seal portion 52a and the seal portion 52b are seamlessly connected. Further, the flat surface-like seal portion 52a originally has a protruding amount (X direction) that has a separation distance H1 and is crushed in the X1 direction in the same manner as the seal portion 52b is crushed in the X1 direction at the separation distance H1. Is formed. Thereby, it is comprised so that oil may not leak out also in the joint part of the seal part 52a and the seal part 52b.

  Further, in the first embodiment, the width Wb (see FIG. 5) of the seal portion 52b that applies a force that shifts upward when crushed in the X1 direction is the same as that when the seal portion 52b is not provided. It is configured to be larger than the width Wa (see FIG. 4) of the seal portion 52a that does not require an upward force to be applied to the inside (the width Wb> the width Wa). In this regard, since the seal portion 52b has a serrated portion 54b with a pointed tip 53b, the contact area of the seal surface 10c with respect to the tip portion 53a formed of a flat surface is originally small, so that the seal portion 52b is made larger. This is because the contact area after deformation (after sealing) is ensured by forming the width Wb.

  Moreover, in 1st Embodiment, as shown in FIG. 6, TCC20 is attached to the engine main body 10 using the stepped volt | bolt 90 which can maintain the separation distance H1. Here, the stepped bolt 90 includes a head 91 to which a tool (not shown) is engaged, a large diameter portion 92 for defining the separation distance H1, and a screw having a diameter smaller than that of the large diameter portion 92. Part 93. When the stepped bolt 90 is tightened into the fixing hole 10d through the through hole 22b, the end surface of the stepped portion 94 between the large diameter portion 92 and the screw portion 93 projects circumferentially into the mounting portion 10b (seal surface 10c). By being put together, a fixed squeezing state is achieved in which the height H2 of the large-diameter portion 92 from the seal surface 10c to the lower surface of the head 91 is uniquely determined. And TCC20 is being fixed in the state in which the attachment part 22 was floated in the separation distance H1 by the sealing member 50 being pinched | interposed between the engine main bodies 10. FIG. The seal member 50 pushes the mounting portion 22 in the X2 direction and presses it against the lower surface of the head 91 by crushing the seal portion 52b by a predetermined amount (appropriate amount) in the X1 direction.

  As shown in FIG. 1, outside the TCC 20, a crank pulley (not shown) is rotatably attached to the front end portion 40 a of the crankshaft 40. Auxiliaries such as a cooling water circulation water pump and a vehicle air conditioning compressor attached to the engine 100 are driven by a belt hung on a crank pulley. Further, the rear end portion 40b of the crankshaft 40 is connected to a power transmission unit (not shown) including a transmission or the like. The structure around the TCC 20 including the engine 100 and the seal member 50 in the first embodiment is configured as described above.

  In the first embodiment, the following effects can be obtained.

  That is, in the first embodiment, as described above, the seal member 50 is provided between the engine body 10 and the TCC 20 and includes the seal portion 52a and the seal portion 52b that contact the seal surface 10c of the engine body 10, Of the reaction force received from the seal surface 10c of the engine body 10, a shape in which the reaction force component in the upward direction opposite to the direction in which gravity acts is larger than the reaction force component in the downward direction, which is the direction in which gravity works ( The tip portion 53b of the seal portion 52b is configured to have the shape shown in FIG. Thus, even when the opening 11 formed in the vertical surface (side end portion 10a) extending in the vertical direction of the engine body 10 is closed from the side with the TCC 20 facing in the horizontal direction, the sealing surface of the engine body 10 is sealed. Since the seal member 52 includes a seal portion 52b having a shape in which the reaction force component directed upward is greater than the reaction component directed downward in which gravity acts, among the reaction forces received from 10c, the seal member 50 includes an annular seal. Even in a portion of the surface 10c where the seal member 50 is displaced due to the vibration of the engine body 10 or the weight of the TCC 20 and the sealing performance is liable to deteriorate (the seal region 10f of the seal surface 10c extending in the horizontal direction). The portion 52b is prevented from shifting in the downward direction of gravity. That is, the seal portion 52b can be continuously disposed at a position where the sealing performance is maintained with respect to the seal surface 10c of the engine body 10. Thereby, even if it is a case where TCC20 is attached facing the horizontal direction with respect to the engine main body 10, the sealing performance between the engine main body 10 and TCC20 is fully securable.

  Further, in the first embodiment, when the TCC 20 is attached to the side of the engine body 10 via the seal member 50, the downward direction received from the seal surface 10c of the engine body 10 when the seal member 50 is elastically deformed. The tip portion 53b of the seal portion 52b is configured to be deformed so as to have a shape (a shape shown in FIG. 6) in which the reaction force component upward is larger than the reaction force component toward . Thereby, when the seal member 50 is crushed in the X1 direction with elastic deformation on the seal surface 10c, the reaction force is directed upward from the reaction force component directed downward from the seal surface 10c of the engine body 10. Since the seal portion 52b can be deformed so as to increase the component, it is possible to easily prevent the seal portion 52b from shifting in the downward direction of gravity (arrow Z2 direction).

  In the first embodiment, the shape of the seal portion 52b is asymmetrical with respect to the vertical line L1 of the seal surface 10c of the engine body 10 and the sawtooth portion 54b extending in the obliquely downward direction intersecting with the downward direction in which gravity acts. The tip part 53b comprised by having uneven | corrugated shape by providing 4 items | stripes is included. As a result, the seal member 52 is easily provided with the seal portion 52b in which the reaction force component directed upward from the reaction force component directed downward from the gravity acting on the reaction force received from the seal surface 10c of the engine body 10 is larger. be able to.

  Further, in the first embodiment, each of the sawtooth portions 54b of the seal portion 52b has a cross-sectional shape in which the protruding amount D toward the engine body 10 increases toward the lower end portion on the Z2 side of the seal portion 52b. Have. As a result, in each of the sawtooth portions 54b of the seal portion 52, the reaction received from the seal surface 10c of the engine body 10 using a cross-sectional shape in which the protruding amount D toward the engine body 10 increases toward the lower end portion. Of the force, the reaction force component directed upward can be easily increased more than the reaction force component directed downward where gravity acts.

  In the first embodiment, the seal member 50 includes a seal portion 52a extending in the vertical direction (Z direction) and a seal portion 52b extending in the horizontal direction (Y direction). And it forms in the uneven | corrugated shape which consists of the sawtooth part 54b extended in the direction which cross | intersects the downward direction which gravity acts with respect to the front-end | tip part 53b of the seal | sticker part 52b. As a result, when the sawtooth portion 54b extending obliquely downward intersecting the downward direction in which gravity acts is formed in the seal portion 52b extending in the horizontal direction, the sawtooth portion 54b is sealed in the vertical direction (downward direction in which gravity acts). Unlike the case where it is formed in the portion 52a, the oil (lubricating oil) does not leak to the outside through the tip portion 53b composed of the sawtooth portion 54b, so that the sealing performance of the entire sealing regions 10e and 10f is secured. It is possible to effectively prevent the seal member 50 (the seal portion 52b) from sliding down in the gravity direction from the region 10f.

  In the first embodiment, the serrated tip 53b of the seal member 50 in which the reaction force component in the upward direction is larger than the reaction force component in the upward direction received from the seal surface 10c of the engine body 10 is used. The width Wb of the seal portion 52b provided with is larger than the width Wa of the seal portion 52a not provided with this shape. As a result, the length (seal width Wb) of the seal portion 52b for preventing sliding downward in the direction of gravity can be increased, and accordingly, the seal member 50 is reduced by gravity on the seal surface 10c of the engine body 10 accordingly. It is possible to effectively suppress (prevent) the downward shifting (sliding down).

  Further, in the first embodiment, the TCC 20 includes an attachment portion 22 attached to the engine main body 10, and the attachment portion 22 of the TCC 20 is separated from the engine main body 10 via the seal member 50 by a separation distance H1. The engine is configured to be attached to the engine body 10 by a stepped bolt 90 capable of maintaining the separation distance H1. This makes it possible to use a stepped bolt 90 capable of maintaining the separation distance H1 to perform fixed-size tightening to keep the separation distance of the TCC 20 from the engine body 10 appropriately, and in this state, it is optimal for the gap between the engine body 10 and the TCC 20 It is possible to arrange the seal member 50 that has been crushed and formed into a simple shape. That is, since the seal member 50 is arranged without causing the crushing margin to be insufficient or excessive, the reaction force received from the seal surface 10c of the engine body 10 is higher than the reaction force component directed downward in the direction of gravity. The seal member 50 (seal portion 52b) can be maintained in an optimal shape in which the reaction force component toward the direction increases.

  Moreover, in 1st Embodiment, the attachment surface 22a of the attachment part 22 with respect to the engine main body 10 of TCC20 is formed in the same planar shape at the periphery, and the groove part 22c provided in the same planar attachment surface 22a of TCC20. The base 51 is fitted along the seal member 50. Thereby, since the attachment surface 22a of the attachment part 22 of the TCC 20 with respect to the engine body 10 can be suppressed to a single surface, the shape is kept simple compared to the case where there are a plurality of attachment surfaces 22a on the TCC 20. As a result, it is possible to obtain the TCC 20 in which both weight reduction (weight reduction) and rigidity ensuring are achieved. Moreover, since the parallelism and flatness of the mounting surface 22a can be properly maintained as much as the rigidity of the TCC 20 is obtained, the sealing performance when the TCC 20 is mounted on the engine body 10 using the seal member 50 is maintained high. can do.

  In the first embodiment, the same planar mounting surface 22a is continuously formed in a circumferential shape along the outer peripheral portion of the TCC 20 (the end portion on the side opposite to the bottom surface portion 21a of the side wall portion 21b). Configure. As a result, the same planar mounting surface 22a is continuously provided circumferentially along the outer periphery of the TCC 20, so that the fastening force of the stepped bolt 90 on the engine body 10 is evenly distributed to the TCC 20 without being unevenly distributed. Can be added. That is, since the pressing force of the seal portions 52a and 52b against the seal surface 10c of the engine body 10 is uniformly applied along the mounting portion 22 which is the outer peripheral portion of the TCC 20, the durability of the seal member 50 is ensured and the engine body is secured. 10 and the TCC 20 can be secured over a long period of time.

  Moreover, in 1st Embodiment, the attaching part 22 is formed in the flange shape provided circumferentially along the outer peripheral part of TCC20. And the attachment part 22a which has the same planar shape is provided in the attachment part 22 which has a flange shape. Accordingly, the TCC 20 can be easily provided with the mounting surface 22a that is coplanar and circumferential.

  In the first embodiment, the mounting portion 22 having the same mounting surface 22a is used as the valve timing system timing member such as the timing chain 5, the camshaft 6, the crankshaft timing sprocket 41, and the camshaft timing sprocket 42. Is provided in a circumferential shape so as to surround. Thus, the same planar mounting surface 22a of the TCC 20 with respect to the engine body 10 may be disposed at a portion outside the above-described valve timing system member that is driven by being supplied with oil (engine oil) of the engine body 10. Therefore, it is possible to easily avoid the oil that splashes up to the inner region of the TCC 20 due to the operation of the valve timing member from leaking outside the engine body 10 beyond the seal surface 10c with the TCC 20. it can.

  In the first embodiment, the TCC 20 is made of resin. Thereby, since the high sealing performance is ensured in the sealing member 50 itself, the TCC 20 is configured using a resin material for the purpose of weight reduction (weight reduction) of the component, and the resin-made TCC 20 is attached to the engine body 10. Even in this case, high sealing performance can be realized between the engine body 10 and the TCC 20. Therefore, it is possible to easily reduce the weight of engine 100 while ensuring high sealing performance against leakage of oil to the outside.

  In the first embodiment, the serrated tip 53b of the seal portion 52b is continuously formed from the upper end to the lower end in the width direction (Z direction) of the seal portion 52b. As a result, not only a part of the seal portion 52b but also all the regions along the width direction (Z direction) of the seal portion 52b are moved in the downward direction of gravity without moving the seal member 50 in the seal surface 10c (seal of the engine body 10). Since it can be arranged at a position where the sealing performance with respect to the region 10f) is maintained, the sealing performance between the engine body 10 and the TCC 20 can be ensured more reliably.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. 1, FIG. 6, FIG. 8, and FIG. In the second embodiment, the tip 253a is applied not only to the seal surface 10c extending in the horizontal direction (Y direction) of the side end portion 10a but also to the seal surface 10c (see FIG. 1) extending in the vertical direction (Z direction). A description will be given of an example in which the seal member 250 is configured so as to contact the seal portion 252a formed in a sawtooth shape. In the figure, components similar to those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

  In the engine according to the second embodiment of the present invention, the TCC 20 is attached to the engine body 10 using the seal member 250. The seal member 250 has a seal portion 52b (see FIG. 5) in the short side direction (horizontal direction), and has a seal portion 252a in the longitudinal direction (vertical direction) as shown in FIG. FIG. 8 shows a surface state of the seal portion 252a when viewed along the X2 direction from the seal surface 10c (see FIG. 1) side. That is, there is a base 51 extending in the Z direction (vertical direction) on the back side of the drawing. The seal portion 252a is an example of the “first seal portion” in the present invention.

  The seal portion 252a has a tip portion 253a having a width Wa (Y direction) and formed in a sawtooth shape. Here, as shown in FIG. 8, the tip portion 253a has a sawtooth shape repeated in the direction of the arrow Z2 (a sawtooth shape from the trough to the next trough from the trough to the next trough) about half in the Z direction (1 A total of five rows from the first row to the fifth row shifted by a half of the length in the Z direction of the two sawtooth portions 254a have a surface shape sequentially connected in the Y direction. Therefore, the valley part (the lowest part of the inclined part) of each row hits the side surface of the inclined part of the sawtooth of the adjacent row, and the valley part ends. As a result, even if valleys (valley width = Wa / 5) extending in the Y direction (horizontal direction) are formed in each row, when viewed as the whole seal portion 252a, The lowest portion is not penetrated from one side (Y1 side) to the other side (Y2 side) along the width direction (Y direction) of the seal portion 252a. The tip portion 253a is an example of the “sawtooth uneven shape” of the present invention, and the sawtooth portion 254a is an example of the “sawtooth portion” of the present invention. Further, the tip portion 253a of the seal portion 252a is provided with a shape such that the reaction force component in the upward direction is larger than the reaction force component in the downward direction received from the seal surface of the internal combustion engine body of the present invention. It is an example of “part”.

  Therefore, in the second embodiment, as shown in FIG. 9, the seal portion 252a having a plurality of sawtooth portions 254a repeatedly provided in the Z direction is crushed in the X1 direction by the fastening force of the stepped bolt 90, The seal portion 252a heads in an upward direction opposite to the direction in which the gravity acts rather than the reaction force component in the downward direction, which is the direction in which the gravity acts, out of the reaction force received from the seal surface 10c (seal region 10e) of the engine body 10. In a state where the reaction force component is deformed so as to increase, it comes into contact with the seal region 10e of the seal surface 10c. The cross-sectional shape of FIG. 9 shows a cross section along line 220-220 (fifth row) in FIG. 8, and the portions of the seal portion 252a corresponding to each row also in the other first to fourth rows. Is deformed in the X1 direction as in FIG.

  As a result, in a state where the TCC 20 is fixed to the engine body 10 with a separation distance H1 through the seal member 250 (fixed to a fixed size), the fastening force of the stepped bolt 90 can be used only in the short direction (horizontal direction). First, the seal portion 252a extending in the longitudinal direction (vertical direction) is subjected to a force that causes the tip 253a to always shift upward (Z1 direction) instead of downward with the deformation in the X1 direction. In this state, the deformed shape is continuously maintained and is in contact (contact) with the seal surface 10c. In addition, the other structure of the engine by 2nd Embodiment is the same as that of the said 1st Embodiment.

  In the second embodiment, the following effects can be obtained.

  That is, in the second embodiment, the seal member 250 includes a seal portion 252a extending in the vertical direction (Z direction) and a seal portion 52b extending in the horizontal direction (Y direction), and includes not only the seal portion 52b but also the seal portion. The tip 253a of the 252a is formed in a shape such that the reaction force component directed upward is larger than the reaction component directed downward from the seal surface 10c of the engine body 10. As a result, in the seal portion 252a extending in the vertical direction of the seal member 250, the reaction force component directed upward is larger than the reaction force component directed downward in the direction of gravity of the reaction force received from the seal surface 10c of the engine body 10. Therefore, it is possible to reliably prevent the seal member 250 (the seal portion 252a) from being displaced downward from the seal surface 10c even in the portion where the seal surface 10c extends in the vertical direction.

  In the second embodiment, the phase of the sawtooth shape (sawtooth shape from the valley to the next valley) repeated in the direction of the arrow Z2 is approximately half in the Z direction (the Z direction of one sawtooth 254a). The front end portion 253a of the seal portion 252a is configured so that a total of five rows from the first row to the fifth row shifted by a half of the length of the first portion to the fifth row have a surface shape sequentially connected in the Y direction. Thus, even when the sealing surface 10c extending in the vertical direction (Z direction) of the engine body 10 is sealed using the sealing portion 252a having a sawtooth shape repeated in the arrow Z2 direction, a valley portion of one sawtooth portion 254a. Does not penetrate horizontally from one side (Y1 side) to the other side (Y2 side) along the width direction (Y direction) of the seal portion 252a. Therefore, the engine body 10 and the TCC 20 are used by using the seal portion 252a. The sealing performance between the two can be ensured. The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. 2, FIG. 10, and FIG. In the third embodiment, unlike the seal member 50 of the first embodiment in which the tip portion 53b is formed in a sawtooth shape, the seal member 350 is configured by forming a plurality of slits (cuts) 354b in the tip portion 353b. Will be described. In the figure, components similar to those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

  In the engine according to the third embodiment of the present invention, the TCC 20 is attached to the engine body 10 using the seal member 350. As shown in FIG. 10, the seal member 350 has a seal portion 352b extending in the short direction (horizontal direction). The seal portion 352b has a tip 353b formed with six slits 354b extending obliquely downward from the upper side (Z1 side) in the width direction (Z direction) toward the lower side (Z2 side). doing. In this case, each of the slits 354b extends in an in-plane direction obtained by rotating the YZ plane around the Y axis with respect to the seal surface 10c (see FIG. 11) formed of the YZ plane of the engine body 10. . Accordingly, the tip 353b including the six slits 354b is configured such that the slit 354b is opened to form an uneven shape when deformed. Here, the uneven shape of the distal end portion 353b when deformed is to suppress the unintentional downward movement of the TCC 20 by utilizing the upward reaction force received from the seal surface 10c, or such Any shape that can be set to the magnitude of the reaction force may be used. The seal portion 352b is an example of the “second seal portion” in the present invention.

  Thereby, in 3rd Embodiment, as shown in FIG. 11, when the seal part 352b in which the six slits 354b were formed in the front-end | tip part 353b is crushed in the X1 direction by the fastening force of the stepped bolt 90, The seal portion 352b has a larger reaction force component in the upward direction opposite to the direction in which the gravity acts than the reaction force component in the downward direction, which is the direction in which the gravity acts, out of the reaction force received from the seal surface 10c of the engine body 10. In a state of being deformed into such a concavo-convex shape, it contacts the seal region 10f of the seal surface 10c. In other words, when the seal portion 352b is elastically deformed, the seal member 350 is higher in the upward direction than the downward reaction force component received from the seal surface 10c due to the deformation of the tip portion 353b of the seal portion 352b. It is comprised so that it may be maintained in the shape (shape shown in FIG. 11) which the reaction force component which goes to becomes large. In addition, the other structure of the engine by 3rd Embodiment is the same as that of the said 1st Embodiment.

  In the third embodiment, the following effects can be obtained.

  That is, in the third embodiment, as described above, the seal portion 352b is in a direction intersecting the seal surface 10c of the engine body 10 and from the upper side (Z1 side) in the width direction (Z direction) to the lower side. It has a tip portion 353b in which six slits 354b extending obliquely downward toward (Z2 side) are formed. As a result, the seal member 352b is easily provided with the seal portion 352b in which the reaction force component directed upward from the reaction force component directed downward from the gravity acting on the reaction force received from the seal surface 10c of the engine body 10 is larger. be able to. As a result, the sealing performance between the engine body 10 and the TCC 20 can be sufficiently ensured using the sealing member 350. The remaining effects of the third embodiment are similar to those of the aforementioned first embodiment.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first and second embodiments, the seal portion 52b is provided with the tip portion 53b having an uneven shape composed of the sawtooth portion 54b asymmetric with respect to the perpendicular L1 of the seal surface 10c of the engine body 10, and the third embodiment. In the embodiment, the tip portion 353b formed with six slits 354b extending obliquely downward from the upper side (Z1 side) to the lower side (Z2 side) with respect to the seal surface 10c of the engine body 10 is used as the seal portion 352b. However, the present invention is not limited to this. That is, a shape in which the reaction force component directed upward in the opposite direction is larger than the reaction force component directed downward in the direction in which gravity acts, among the reaction force received from the seal surface 10c (shape capable of preventing deviation). If the seal portion can be configured so as to have the shape, the tip portion that contacts the seal surface 10c and causes deformation may have a shape other than the above-described shape.

  In the second embodiment, the portions where the serrated portions 254a of the seal member 250 are repeated in a row in the vertical direction are joined in the horizontal direction by shifting the phase of the saw-tooth shape in the horizontal direction and integrated with the seal portion 252a. Although the configuration example is shown, the present invention is not limited to this. The number of columns connected in the horizontal direction may be other than five as long as it is three or more.

  In the first to third embodiments, the seal members 50 (250) and 350 are used when the TCC 20 is attached to the side end portion 10a extending in the vertical direction of the engine body 10 in the horizontal direction. Although an example has been shown, the present invention is not limited to this. For example, even when the head cover is attached to the cylinder head (cam cover) from above, a part of the sealing surface for sealing the opening is a vertical surface and extends in a narrow width in the horizontal direction. You may apply the sealing member which has the seal part 52b or the seal part 352b with respect to a part. In this way, any cover member that is attached to the engine body 10 so as to cover the valve train timing member can be applied to a cover member attachment structure other than the TCC 20.

  Moreover, in the said 1st-3rd embodiment, although shown about the example which applied this invention to the engine 100 which consists of a gasoline engine, this invention is not limited to this. That is, if the internal combustion engine has a crankshaft, the present invention may be applied to gas engines other than gasoline engines (internal combustion engines such as diesel engines and gas engines). Further, the present invention may be applied to an internal combustion engine that is installed as a drive source (power source) of equipment other than for automobiles.

1 Cam Cover 2 Cylinder Head 3 Cylinder Block 4 Crankcase 5 Timing Chain (Valve Valve Timing Member)
6 Camshaft (Valve system timing member)
10 Engine body (Internal combustion engine body)
10a Side end portion 10b Mounting portion 10c Seal surface 10e, 10f Seal region 20 Timing chain cover (TCC) (cover member)
22 Mounting part (flange-shaped part)
22a Mounting surface 40 Crankshaft 41 Crankshaft timing sprocket (valve system timing member)
42 Camshaft timing sprocket (valve system timing member)
50, 250, 350 Seal member 52a, 252a Seal part (first seal part)
52b, 352b Seal part (second seal part)
53b, 253a, 353b Tip (saw-toothed irregular shape)
54b, 254a sawtooth portion (sawtooth portion, serrated irregular shape)
90 Stepped bolt (fastening member)
100 engine (internal combustion engine)
354b slit

Claims (13)

A cover member attached to the side of the internal combustion engine body so as to cover the valve timing system member using the lubricating oil of the internal combustion engine body;
A seal member disposed between the internal combustion engine body and the cover member and including a seal portion that abuts against a seal surface of the internal combustion engine body,
At least a part of the seal portion is directed upward in the direction opposite to the direction in which gravity acts, rather than the reaction force component in the downward direction, which is the direction in which gravity acts, out of the reaction force received from the seal surface of the internal combustion engine body. An internal combustion engine having a shape in which a reaction force component increases.   In a state where the cover member is attached to the side of the internal combustion engine main body via the seal member, when the seal member is elastically deformed, the downward reaction received from the seal surface of the internal combustion engine main body. The internal combustion engine according to claim 1, wherein at least a part of the seal portion is deformed so as to have the shape such that a reaction force component directed upward is larger than a force component. .   The shape of the seal portion has a serrated irregular shape that is asymmetric with respect to the normal of the seal surface of the internal combustion engine body, or a slit that extends in a direction intersecting the seal surface of the internal combustion engine body. The internal combustion engine according to claim 1 or 2, comprising a shape.   4. The sawtooth portion of each of the seal portions having the asymmetric serrated uneven shape has a cross-sectional shape in which an amount of protrusion toward the internal combustion engine body increases toward a lower end portion. Internal combustion engine. The serrated irregular shape or the shape having the slit is formed so as to extend in a direction intersecting with the lower direction in which gravity works,
The seal portion of the seal member includes a first seal portion extending in the vertical direction and a second seal portion extending in a direction intersecting the vertical direction,
5. The internal combustion engine according to claim 3, wherein at least a part of the second seal portion is provided with the serrated uneven shape or the shape having the slits extending in a direction intersecting a lower direction in which the gravity acts. organ.   Of the seal portion of the seal member, the shape is provided such that the reaction force component in the upward direction is larger than the reaction force component in the downward direction received from the seal surface of the internal combustion engine body. The internal combustion engine according to claim 1, wherein the portion has a larger seal width than a portion where the shape is not provided. The cover member includes an attachment portion attached to the internal combustion engine main body,
The internal combustion engine main body is formed by a fastening member capable of maintaining the predetermined mounting height in a state where the mounting portion of the cover member is spaced from the internal combustion engine main body by a predetermined mounting height via the seal member. The internal combustion engine according to claim 1, wherein the internal combustion engine is attached to the engine. The attachment surface of the cover member to the internal combustion engine main body is formed in a circumferential shape in the same plane,
The internal combustion engine according to any one of claims 1 to 7, wherein the seal member is disposed on the same flat mounting surface of the cover member.   The internal combustion engine according to claim 8, wherein the coplanar mounting surface is continuously formed circumferentially along an outer peripheral portion of the cover member. The cover member includes a flange-like portion provided circumferentially along the outer periphery of the cover member;
The internal combustion engine according to claim 9, wherein the mounting surface having the same planar shape is formed in the flange-shaped portion.   11. The internal combustion engine according to claim 10, wherein the flange-shaped portion on which the same mounting surface is formed is provided in a circumferential shape so as to surround the valve timing member.   The internal combustion engine according to claim 1, wherein the cover member is made of resin. A cover member attached to the side of the internal combustion engine body so as to cover the valve timing system member using the lubricating oil of the internal combustion engine body;
A seal member disposed between the internal combustion engine body and the cover member and including a seal portion that abuts against a seal surface of the internal combustion engine body,
At least a part of the seal portion is directed upward in the direction opposite to the direction in which gravity acts, rather than the reaction force component in the downward direction, which is the direction in which gravity acts, out of the reaction force received from the seal surface of the internal combustion engine body. A cover mounting structure for an internal combustion engine having a shape that increases a reaction force component.

Images