JP2015094233A - Head cover structure of engine and suspension structure of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve support rigidity of a head cover.SOLUTION: An engine has a driving force transmission mechanism for transmitting driving force of a crankshaft to a valve train on one end side of a cylinder row direction, an expansion part 36 covering an upper part of the driving force transmission mechanism is provided on one end side of the cylinder row direction of a head cover 18, a mount bracket for supporting a front side of the engine is attached to the expansion part 36, and a tilt surface part 52 having a tilt surface 37 falling and tilted toward the other end side of the cylinder row direction is provided on the expansion part 36, and the tilt surface 37 is formed so as to rise from an intermediate position of the cylinder row direction and continue to a first flat surface 40a and a second flat surface 40c as top surfaces of the expansion part 36 on the one end side of the cylinder row direction.

Description

  The present invention relates to, for example, an engine head cover structure mounted on an automobile or the like and a suspension structure thereof.

  In general, when mounting an engine on a vehicle, various mount arrangements that are optimal in the vertical direction, left-right direction, and front-rear direction of the vehicle have been studied for stable mounting. For example, the upper and lower sides of the engine are supported. The structure (for example, refer patent document 1 and patent document 2) which arrange | positions the engine mount (mount member) to be spaced apart in the front-back direction of an engine is known. In this case, it is known that when the mount members are separated in the vertical direction, the horizontal direction, and the front-back direction as much as possible, the engine can be stably supported when the vehicle travels.

  In order to mount the engine stably, for example, it is conceivable to attach a mount member to a component disposed on the upper part of the engine. However, the head cover constituting the upper part of the engine is a rectangular part made of a thin plate member with a hollow inside, and is vulnerable to a load in the vertical direction. For this reason, in order to support the heavy engine with the head cover, reinforcement such as forming a thick wall is necessary. However, if the thick wall is reinforced, the weight of the engine may be further increased. .

  Therefore, there is a known structure in which a mounting bracket is attached to a timing chain cover that can be fastened to an engine body such as a cylinder block even when the cover member is the same as the head cover.

  For example, in Patent Document 3, the timing chain cover (timing cover) is divided into three parts including a head cover part, a cylinder head part, and a cylinder body part, and the stay is fixed to the side wall of the head cover part constituting the timing chain cover. ing. In Patent Literature 3, an engine suspension structure is employed in which the engine head cover is fixed to the strut tower via the stay.

  Patent Document 4 discloses that a mounting bracket mounting seat on which a mounting bracket for mounting an engine is mounted is provided on the upper surface of an upper extension portion of a timing chain cover (timing cover).

JP-A-6-313463 Japanese Patent No. 3018867 Japanese Patent No. 2758478 Japanese Patent No. 4556921

  However, at the present time, it seems that no suitable mount mounting structure that harmonizes both the mounting rigidity and the optimal mounting position has been proposed. Therefore, unlike the structure in which stays and mount brackets are attached to the timing chain cover (timing cover) as in Patent Documents 3 and 4, when an engine mount for supporting the engine is attached to the head cover, Mount load is input to the head cover. Therefore, there is a demand for a head cover configuration having high rigidity (support rigidity) capable of supporting a mount input load corresponding to the weight of the engine while allowing the engine mount to be attached to the head cover.

  The present invention has been made in view of the foregoing points, and an object of the present invention is to provide an engine head cover structure and a suspension structure thereof capable of improving the support rigidity of the head cover.

  To achieve the above object, the present invention provides an engine head cover structure in which an engine mount portion for suspending an engine on a vehicle body frame is attached to an upper surface of a head cover that covers a valve operating mechanism. A driving force transmission mechanism that transmits the driving force of the crankshaft to the valve mechanism on one end side in the cylinder row direction, and covers the upper side of the driving force transmission mechanism on one end side in the cylinder row direction of the head cover. A bulging portion is provided, and the engine mount portion is attached to the bulging portion, and the bulging portion has an inclined surface portion having an inclined surface that is inclined toward the other end side in the cylinder row direction. The inclined surface is formed so as to rise from an intermediate position in the cylinder row direction and to be continuous with the top surface of the bulging portion at one end side in the cylinder row direction. .

  When an engine mount for supporting the engine is attached to the head cover, vibrations during vehicle travel, centrifugal force during turning, and longitudinal loads during acceleration / deceleration are input from the engine mount to the head cover. . Compared to a conventional rectangular head cover, in the present invention, the engine mount is attached to the protruding portion that covers the driving force transmission mechanism, so that the relatively expanded portion is not required even if the head cover is made thick. Since the inclined surface is formed so as to be connected to the bulging portion and the height dimension is gradually increased by the inclined surface toward one end side in the cylinder row direction, the entire inclined surface Functions as a rib (rigid rib). In addition, by configuring as a surface rather than a simple rib, the present invention can improve the centrifugal force and the rigidity in the left-right direction not only in the vertical direction, but also stably while suppressing the increase in the weight of the engine. The engine can be supported.

  Further, the present invention is characterized in that a first rib extending along a cylinder row direction is formed on the head cover, and one end side of the first rib is continuous with the bulging portion.

  According to the present invention, by providing the first rib extending along the cylinder row direction at the bulging portion to which the mount input load is input, the rigidity of the head cover can be further increased, and the deformation of the head cover is suppressed. The engine can be supported stably.

  Further, according to the present invention, an opening is formed on a side wall on one end side in the cylinder row direction of the bulging portion, and a cover member that closes the opening is provided, and a part of the cover member is provided on the head cover. The remaining portion of the cover member is fastened to the cylinder head, and the bulging portion of the head cover is provided with a first fastening portion that fastens the engine mount portion to the head cover. The bulging portion is further provided with a second fastening portion for fastening the cover member to the head cover, and the fastening direction of the first fastening portion and the fastening direction of the second fastening portion are substantially orthogonal to each other. And

  According to the present invention, the fastening direction of the first fastening part for fastening the engine mount part to the head cover and the fastening direction of the second fastening part for fastening the cover member to the head cover are substantially orthogonal to each other, and the first By providing the second fastening portion of the cover member in the vicinity of the one fastening portion and configuring the fastening boss portion of the cover member around the first fastening portion, the thickness of the head cover can be partially increased. As a result, the rigidity of the head cover around the first fastening portion is increased, and the fastening boss portion of the first fastening portion and the fastening boss portion of the second fastening portion are formed in a direction substantially orthogonal to each other. Since the rigidity around one fastening part can be increased not only in one direction but also in multiple directions, the increase in engine weight is suppressed and sufficient rigidity against multi-directional loads input from the engine mount part is increased. Can do.

  Further, according to the present invention, the cover member includes a head cover covering portion fastened to the head cover and a cylinder head covering portion fastened to the cylinder head, and the cover member includes the head cover and the cylinder head. It is characterized by being fastened across the mating surfaces.

  When the engine mount portion is attached to the head cover, a force for separating the mating surfaces (coupling surfaces) of the head cover and the cylinder head from each other is generated by a load (mount input load) input from the engine mount portion. According to the present invention, when the mount input load acts on the mating surface of the head cover and the cylinder head, the cover member that covers both of the mating surfaces of the head cover and the cylinder head functions as a rigid member. It is possible to suitably avoid the occurrence of a gap between the mating surfaces due to opening of the mating surface between the cylinder head and the cylinder head.

  In other words, when the cover member is fastened across the mating surface of the head cover and the cylinder head, a force for coupling the mating surfaces of the head cover and the cylinder head works, and the coupling state of the mating surfaces can be firmly held. it can.

  Furthermore, the present invention provides a second fastening member in which a plurality of first fastening members fastened to the first fastening portion are provided apart from each other in a direction intersecting the cylinder row direction and fastened to the second fastening portion. At least one of these is located within a range between the axes of the first fastening members adjacent to each other.

  According to the present invention, when the mount input load acts within the range between the axes of the adjacent first fastening members, at least one second fastening member for fastening the cover member within the range is provided. Since the fastening boss portion of the first fastening member and the fastening boss portion of the second fastening member can locally increase the thickness of the portion to which the mount input load is input (partially), the rigidity can be increased. Deformation can be suppressed and the engine can be supported stably.

  Furthermore, in the present invention, at least two openings are formed in the head cover for inserting a member that passes through the head cover, and the head cover is connected with at least two openings in the cylinder row direction. The second rib is provided.

  According to the present invention, even when at least two openings for inserting a member that is held through are formed in the head cover, the second ribs that connect the two openings in the cylinder row direction are rigid. The desired rigidity can be ensured without lowering.

  Still further, according to the present invention, an insertion hole through which an oil control valve is inserted is formed in the bulging portion, and the first fastening member and / or the second is formed at one end of the bulging portion in the cylinder row direction. A boss portion for fastening the fastening member is formed to bulge inside the head cover, and a third rib for connecting the peripheral edge portion of the insertion hole and the boss portion is provided on the inner surface of the head cover. It is characterized by.

  According to the present invention, the third rib that connects the peripheral portion of the insertion hole and the boss portion even when the insertion hole for inserting the oil control valve is formed in the bulging portion that supports the engine mount portion. Therefore, the desired rigidity can be ensured without lowering the rigidity.

  Furthermore, the present invention is a vertical V-type engine suspension structure mounted on a vehicle body frame so that a cylinder row is positioned along the vehicle longitudinal direction, and the driving force of the crankshaft is controlled by a valve mechanism. And a first engine mount portion is fastened to an upper surface of a head cover that covers the valve operating mechanism of each bank, and the engine of the engine in the vehicle front-rear direction is provided. A second engine mount portion is fastened to a transmission attached to the rear end side, and a first engine mount portion on the front side provided on the head cover, and a second engine mount portion on the rear side provided on the transmission, It is attached so that it may be located on the inertia main axis | shaft of the said engine.

  According to the present invention, the front first engine mount portion provided on the head cover and the rear second engine mount portion provided on the transmission are attached so as to be positioned on the inertia main shaft of the engine. As a result, even when the weight of the cylinder head is relatively large, such as a V-type engine, it is possible to suppress vibration at the time of starting the engine and improve steering stability.

  According to the present invention, it is possible to obtain an engine head cover structure and its suspension structure capable of improving the support rigidity of the head cover.

1 is a front view of a V-type engine to which a head cover structure according to an embodiment of the present invention is applied. It is a partial cross section enlarged front view of a head cover and a cylinder head in the state where a cover member was removed from an engine. It is an expansion perspective view of the right bank containing a cover member. It is the disassembled perspective view which removed the cover member from the state shown in FIG. FIG. 5 is a plan view of the head cover shown in FIG. 4. FIG. 6 is a side view of the head cover as viewed from the direction of arrow X in FIG. 5. FIG. 6 is a bottom view of the head cover shown in FIG. 5. It is an expanded sectional view along the VIII-VIII line of FIG. It is an expanded sectional view along the IX-IX line of FIG. It is a partial virtual perspective view which shows the state in which the engine and the transmission were mounted in the vehicle body frame. It is a top view of the engine and transmission shown in FIG. It is a side view of the engine and transmission shown in FIG. It is a front view of the engine and transmission shown in FIG.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. FIG. 1 is a front view of a V-type engine to which a head cover structure according to an embodiment of the present invention is applied. FIG. 2 is a partially enlarged front view of a head cover and a cylinder head in a state where a cover member is removed from the engine. 3 is an enlarged perspective view of the right bank including the cover member, and FIG. 4 is an exploded perspective view of the cover member removed from the state shown in FIG. Note that “front and rear” and “up and down” indicated by arrows in each figure indicate the front and rear direction and vertical direction (vertical vertical direction) of the vehicle, and “left and right” indicate the left and right direction (vehicle width direction) of the vehicle. Each is shown. Reference symbol A indicates a cylinder axis, and reference symbols M1 and M2 indicate mount brackets, respectively.

  As shown in FIGS. 1 and 2, the engine 10 to which the head cover structure according to the embodiment of the present invention is applied is configured by a V-type multi-cylinder engine having left and right V-shaped banks 12. The engine 10 is arranged vertically along the vehicle front-rear direction. A transmission 14 (see FIGS. 10 to 12) that has a plurality of gear stages (not shown) and functions as a speed change mechanism is provided behind the engine 12.

  The engine 10 includes a cylinder head 16, a head cover 18 connected to the upper part of the cylinder head 16 via a bolt 17, a cylinder block 20 connected to the lower part of the cylinder head 16, and a cylinder provided at the lower part of the cylinder block 20. And a block lower 22. A mating surface 24 is provided between the head cover 18 and the cylinder head 16 to integrally couple the lower surface of the head cover 18 and the upper surface of the cylinder head 16 to each other. The mating surface 24 is a surface substantially orthogonal to the cylinder axis A, and extends along the cylinder row direction (see FIGS. 3 and 4). The cylinder row direction refers to the direction of a plurality of cylinder rows each having a plurality of cylinders arranged in series. In the present embodiment, since the engine 10 is arranged vertically, the cylinder row direction coincides with the vehicle longitudinal direction.

  The cylinder block 20 is provided with a cylinder bore and a crankcase (not shown). Inside the cylinder block 20, a piston, a connecting rod, a crankshaft and the like (not shown) are accommodated. In FIG. 1, a point O indicates an axis that is the center of the crankshaft (crankshaft). The axial direction of the crankshaft coincides with the cylinder row direction.

  The cylinder head 16 forms a combustion chamber (not shown) together with the cylinder block 20. An intake port and an exhaust port (not shown) communicating with the combustion chamber are formed inside the cylinder head 16, and a valve operating valve including an intake valve and an exhaust valve (not shown) that opens and closes the intake port and the exhaust port. A mechanism is provided. As shown in FIG. 2, two camshafts (not shown) including an intake side camshaft 17 a and an exhaust side camshaft 17 b are arranged on the upper side of the cylinder head 16. The two camshafts extend along the vehicle front-rear direction and are arranged side by side so that their axes are parallel to each other.

  A pair of cover members 26 provided over both the cylinder head 16 and the head cover 18 and a timing train cover (chain cover) 28 provided on the cylinder block 20 and the cylinder block lower 22 are provided at the vehicle front end of the engine 10. It is divided and arranged. The timing train cover 28 forms a timing train chamber with the engine body and covers a cam timing chain (not shown). The cam timing chain is disposed on one end side in the cylinder row direction of the engine 10 and functions as a driving force transmission mechanism. The rotational driving force of the crankshaft is transmitted to the valve operating mechanism via a cam timing chain (not shown). Since the pair of cover members 26 are formed in substantially the same shape on the left and right, the left cover member 26 will be described in detail toward FIG. 1, and the description of the right cover member 26 will be omitted.

  As shown in FIG. 4, a substantially circular opening 19 is formed on the front end side of the engine 10 along the cylinder row direction by the side walls 16 a and 18 a of the cylinder head 16 and the head cover 18. The opening 19 is formed by combining an opening on the cylinder head 16 side and an opening on the head cover 18 side with a mating surface 24. The opening 19 has a shape surrounding the periphery thereof, and an attachment surface 21 to which the cover member 26 is attached from the direction described later is formed. A fastening hole (second fastening portion) 23 to which a fastening bolt 30 described later is fastened is formed on the mounting surface 21. The side walls 16a and 18a are not separated from the cylinder head 16 and the head cover 18, but are rigidly formed by being integrally formed with the cylinder head 16 and the head cover 18, respectively.

  The cover member 26 is configured integrally with a head cover covering portion 26a fastened to the head cover 18 and a cylinder head covering portion 26b fastened to the cylinder head 16 with the mating surface 24 as a boundary (FIG. 3, FIG. 3). (See FIG. 4). 1 and 2, when viewed from the front, the head cover covering portion 26a has a semi-elliptical shape, the cylinder head covering portion 26b has a triangular shape, and the cover member 26 has both shapes combined. It is formed in the shape. A curved portion 25 is formed on the outer peripheral edge of the cover member 26 so as to be spaced apart in the circumferential direction and project outward in the radial direction. The bending portion 25 is formed with an insertion hole for penetrating the cover member 26 and inserting a fastening bolt 30 described later.

  The cover member 26 is fastened across the mating surface 24 between the head cover 18 and the cylinder head 16 (see FIG. 3). Further, as shown in FIG. 4, the cover member 26 is provided with a fastening bolt (second fastening member) 30 such as a hexagon bolt from the direction orthogonal to the mating surface 24 of the cylinder head 16 and the head cover 18. Is attached through. Further, the cover member 26 has a width dimension W2 that substantially matches the entire width W1 of the mating surface 24 (see FIG. 1).

  Further, as shown in FIG. 2, the cover member 26 has a side 34 that is substantially parallel to the axis T of a fastening bolt (first fastening member) 32 that fixes the mount bracket M to the head cover 18. In the plurality of fastening bolts 30 that fasten the cover member 26, the side 34 is configured by a substantially straight line (see halftone dot portion) that connects the center of the upper fastening bolt 30a and the center of the lower fastening bolt 30b (see the halftone dot portion). 3 and 4).

  Furthermore, as shown in FIG. 1, the lower end of the cover member 26 along the cylinder axis A direction does not reach the cylinder block 20, and is partitioned by the lower portion of the cylinder head 16 along the cylinder axis A direction. ing. In addition, in this embodiment, although the hexagon bolt in which the head was formed in the hexagon as the fastening bolt 32 is illustrated, it is not limited to this, The stud bolt in which the head is not provided is used. Also good.

  As shown in FIGS. 3 and 4, the head cover 18 is provided with a bulging portion 36 that is located at an upper portion of the front end portion of the vehicle and protrudes upward from other portions of the head cover 18. The bulging portion 36 is provided with an inclined surface 37 that is inclined downward from the bulging portion 36 toward the vehicle rear side in the cylinder row direction. As shown in FIG. 9, the bulging portion 36 is formed larger in height than the other parts of the head cover 18, and the bulging portion 36 and the inclined surface 37 have increased rigidity and strength. .

  On one end side of the bulging portion 36 along the cylinder row direction, as shown in FIG. 2 as viewed from the front side of the vehicle, a first flat surface 40a close to the valley 38 side between the left and right banks 12, and a first flat surface An inclined surface 40b that falls from the surface 40a toward the outside in the vehicle width direction, and a second flat surface 40c that is positioned lower than the first flat surface 40a in the vertical direction and continues from the inclined surface 40b toward the outside in the vehicle width direction. Is provided.

  The first flat surface 40a and the second flat surface 40c are formed with screw holes 42 into which the screw portions of the fastening bolts 32 are screwed. One end portion of the mount bracket M1 (engine mount portion) is fastened through the fastening bolts 32 screwed into the screw holes 42 of the first flat surface 40a and the second flat surface 40c. The other end of the mount bracket M1 is fastened to the vehicle body frame 46a via a vibration isolator 44a (see FIG. 5).

  The fastening direction of the fastening bolt (first fastening member) 32 that fastens the mount bracket M1 with respect to the head cover 18 from the top to the bottom, and the cover member 26 with respect to the head cover 18 and the cylinder head 16 in the cylinder row direction. The fastening direction of the fastening bolt (second fastening member) 30 to be fastened along is set so as to be substantially orthogonal.

  Further, as shown in FIG. 1 with reference to FIG. 2, two fastening bolts 32 for fastening the mount bracket M1 to the head cover 18 are provided apart from each other in a direction intersecting the cylinder row direction. The two fastening bolts 30c and 30d in the plurality of fastening bolts 30 that fasten the bolt 26 to the head cover 18 and the cylinder head 16 are provided so as to be positioned within the range between the axes T of the pair of fastening bolts 30 adjacent to each other. It is done.

Further, the structure of the head cover 18 will be described in detail with reference to FIGS.
5 is a plan view of the head cover shown in FIG. 4, FIG. 6 is a side view of the head cover seen from the direction of arrow X in FIG. 5, FIG. 7 is a bottom view of the head cover shown in FIG. FIG. 9 is an enlarged cross-sectional view taken along line VIII-VIII, and FIG. 9 is an enlarged cross-sectional view taken along line IX-IX in FIG.

  As shown in FIG. 5, a bulging portion 36 that covers the upper side of the driving force transmission mechanism is provided on one end side of the head cover 18 in the cylinder row direction. On the upper surface of the bulging portion 36, an inclined surface portion 52 having an inclined surface 37 that is inclined toward the other end side in the cylinder row direction is provided.

  As shown in FIG. 6, the inclined surface 37 rises from an intermediate position in the cylinder row direction of the head cover 18 and is formed on the first flat surface 40 a and the second flat surface 40 c of the bulging portion 36 at one end side in the cylinder row direction. Each is formed to be continuous. In addition, the 1st flat surface 40a and the 2nd flat surface 40c of the bulging part 36 function as a top surface and a 1st fastening part, respectively.

  The inclined surface 37 includes a first inclined surface 37a having an inclination angle θ1 with respect to the lower surface 18a of the head cover 18, a second inclined surface 37b having an inclination angle θ2 with respect to the lower surface 18a, and a first inclined surface 37a. It is comprised from the substantially flat surface 37c interposed between the 2nd inclined surfaces 37b. By interposing a substantially flat surface 37c between the first inclined surface 37a and the second inclined surface 37b, the inclination angles θ1 and θ2 of the first inclined surface 37a and the second inclined surface 37b are set to be different from each other. Becomes easy. The inclination angles θ1 and θ2 of the first inclined surface 37a and the second inclined surface 37b may be set to the same or substantially the same inclination angle.

  The intermediate position where the inclined surface 37 rises in the cylinder row direction of the head cover 18 is preferably a position closer to one end side from the central position of one end side and the other end side of the head cover 18 in the cylinder row direction. In addition, the inclination angles θ1 and θ2 of the first inclined surface 37a and the second inclined surface 37b are components in the vertically downward direction of the mount input load received by the first flat surface 40a and the second flat surface 40c of the bulging portion 36, respectively. Is preferably set to be the largest.

  Further, as shown in FIG. 5, the head cover 18 is formed with a pair of first ribs 54 extending in the cylinder row direction in plan view. The pair of first ribs 54 are parallel to each other and extend linearly. One end side of the pair of first ribs 54 is formed continuously with the bulging portion 36.

  Further, as shown in FIG. 8, a hollow oil passage 56 that is sealed at one end side in the cylinder row direction is formed inside the pair of first ribs 54. Lubricating oil is dropped or discharged through a plurality of small holes (not shown) communicating with the oil passage 56, whereby the intake side camshaft 17a and the exhaust side camshaft 17b provided on the upper side of the cylinder head 16 are connected. Lubricity can be improved.

  Furthermore, the head cover 18 is formed with three openings 58 through which front and rear surfaces of the head cover 18 are inserted and through which a spark plug (not shown) held by the cylinder head 16 is inserted. The 2nd rib 60 connected by is provided. The second rib 60 is arranged in an inclined shape intersecting the axis B of the head cover in plan view (see FIG. 5), and is formed by a vertical wall protruding upward in the cross section (see FIG. 8).

  The bulging portion 36 is formed with a pair of openings (insertion holes) 64 through which an oil control valve (hereinafter referred to as OCV) 62 (see FIGS. 3 and 4) is inserted. The pair of openings 64 has a substantially oval shape in a plan view, and is disposed at a predetermined distance in a direction orthogonal to the cylinder row direction.

  The OCV 62 is attached to a cam holder (not shown) fastened to the cylinder head 16. This cam holder (not shown) is configured separately from the cylinder head 16. The OCV 62 is provided such that a part thereof is exposed to the outside through the opening 64 without being in contact with the inner peripheral edge of the opening 64. Further, since the OCV 62 is mounted (supported) on the cam holder on the cylinder head 16 side, the vibration of the head cover 18 to the OCV 62 is prevented from being transmitted. The cam holder (not shown) to which the OCV 62 is attached is preferably configured separately from the head cover 18.

  As shown in FIG. 7, a plurality of bosses 66 swelled and formed at one end in the cylinder row direction on the inner wall of the head cover 18 facing the cylinder head 16 are provided. The fastening bolt 30 is screwed into the boss portion 66. The head cover 18 is provided with a third rib 68 that connects the peripheral edge portion 64 a of the insertion hole 64 and the boss portion 66.

  10 is a partially virtual perspective view showing a state where the engine and the transmission are mounted on the body frame, FIG. 11 is a plan view of the engine and the transmission shown in FIG. 10, and FIG. 12 is a plan view of the engine and the transmission shown in FIG. FIG. 13 is a side view of the engine and transmission shown in FIG.

  Inside the vibration isolator 44a, for example, a cylindrical bush (not shown) formed of an elastic body is provided, and the front side of the engine 10 is floatingly supported by this bush. The vibration isolator 44a is preferably a liquid seal type active vibration isolator. Thus, the front side of the engine 10 along the vehicle front-rear direction is suspended and supported via the pair of mount brackets M1 and the vibration isolator 44a fastened to the vehicle body frame 46a (see FIG. 7). Note that the pair of mount brackets M1 and the vibration isolator 44a function as a first engine mount.

  As shown in FIGS. 10 to 13, a transmission 14 connected to the rear side of the engine 10 is provided with a pair of bolts 50 at a lower portion of the rear end portion of the vehicle and on both left and right sides in the vehicle width direction. A mount bracket M2 is attached. The pair of mount brackets M2 is floatingly supported on the vehicle body frame 46b via, for example, a vibration isolator 44b having a cylindrical bush (not shown). Note that the pair of mount brackets M2 and the vibration isolator 44b function as a second engine mount.

  The engine 10 includes a pair of front mounting brackets M1 and a vibration isolator 44a (first engine mount portion) provided on the head cover 18, and a pair of rear mounting brackets M2 and a vibration isolation device 44b attached to the transmission 14. The second engine mount is suspended so as to be positioned on the inertial main axis PAI of the engine 10.

  That is, as shown in a side view of FIG. 7, a fastening point P1 of the mount bracket M1 with respect to the head cover 18 is provided on the front side on the principal axis of inertia (PAI), and the mount bracket M2 with respect to the transmission 14 is provided on the rear side. A fastening point P2 is provided. The inertia main axis PAI refers to a special axis having the center of gravity G of the engine 10 as the origin.

  Thus, by arranging the mount fastening points P1 and P2 in the front-rear direction of the engine 10 on the inertial main axis PAI, the steering stability can be improved. Further, by considering the inertial spindle PAI, the mount position of the engine 10 can be set to an appropriate position where engine vibration can be reduced.

  The engine 10 to which the head cover structure according to the present embodiment is applied is basically configured as described above. Next, the function and effect will be described.

  When the mount bracket M1 for supporting the engine 10 and the vibration isolator 44a are attached to the head cover 18, vibration during vehicle travel, centrifugal force during turning, and front and rear during acceleration / deceleration from the mount bracket M1 to the head cover 18 Directional load etc. are input. In this embodiment, the mount bracket M1 is attached to the bulging portion 36 that protrudes so as to cover the driving force transmission mechanism, so that the head cover 18 does not have to be thicker than the conventional rectangular head cover. By forming the inclined surface 37 so that the bulging portion 36 has relatively high rigidity and is connected to the bulging portion 36, the inclined surface 37 gradually increases the height dimension toward one end side in the cylinder row direction. Since it is large, the entire inclined surface 37 functions as a rib (partial rigid rib). In the present embodiment, the inclined surface 37 forms partial rigid ribs in the bulging portion 36 to which the mount input load corresponding to the weight of the engine 10 is input, so that the mount input load from multiple directions is prevented. High rigidity can be secured.

  In this embodiment, the pair of first ribs 54 extending in the cylinder row direction is provided in the bulging portion 36 to which the mount input load is input, thereby preventing the head cover 18 from being deformed in the cylinder row direction. The sealing property of the head cover 18 can be ensured.

  Furthermore, in this embodiment, the fastening direction of the fastening bolt 32 that fastens the mount bracket M1 to the head cover 18 and the fastening direction of the fastening bolt 30 that fastens the cover member 26 to the head cover 18 and the cylinder head 16 are substantially orthogonal to each other; The fastening hole 23 (mounting surface 21) for fastening the cover member 26 is provided in the vicinity of the first flat surface 40a and the second flat surface 40c of the bulging portion 36, and the first flat surface 40a and the first flat surface 40a of the bulging portion 36 are provided. 2 By arranging the fastening hole 23 (mounting surface 21) of the cover member 26 around the flat surface 40c, the thickness of the head cover 18 can be partially increased (see FIG. 9). As a result, the rigidity of the head cover 18 around the first flat surface 40a and the second flat surface 40c of the bulging portion 36 is increased, and further, the screw hole 42 (fastening boss portion of the first fastening portion) of the fastening bolt 32 is fastened. Since the fastening holes 23 of the bolts 30 (fastening bosses of the second fastening part) are formed in a direction substantially perpendicular to each other, the rigidity around the first flat surface 40a and the second flat surface 40c of the bulging part 36 is obtained. Can be increased not only in one direction but also in multiple directions, it is possible to increase sufficient rigidity against a multidirectional load input from the mount bracket M1 while suppressing an increase in engine weight.

  When the mount bracket M1 is attached to the bulging portion 36 of the head cover 18, a force for separating the mating surfaces 24 (joint surfaces) of the head cover 18 and the cylinder head 16 from each other by the mount input load input from the mount bracket M1. Occurs. In the present embodiment, when the mount input load acts on the mating surface 24 of the head cover 18 and the cylinder head 16, the cover member 26 that covers both the straddling surfaces 24 of the head cover 18 and the cylinder head 16 is used as the rigid member. By functioning, it is possible to suitably avoid the occurrence of a gap between the mating surfaces 24 due to opening of the mating surface 24 between the head cover 18 and the cylinder head 16.

  In other words, when the cover member 26 is fastened across the mating surface 24 between the head cover 18 and the cylinder head 16, a force for coupling the mating surface 24 between the head cover 18 and the cylinder head 16 works. The state can be held firmly.

  Furthermore, in the present embodiment, when the mount input load acts within the range between the axes T of the pair of adjacent fastening bolts 32, the two fastening bolts 30c and 30d for fastening the cover member 26 are provided within the range. (See FIG. 1), the mount input load is caused by the screw hole 42 (fastening boss portion of the first fastening portion) of the fastening bolt 32 and the fastening hole 23 (fastening boss portion of the second fastening portion) of the fastening bolt 30. Since the thickness of the part to be input can be locally increased (partially) to increase the rigidity, the deformation of the head cover 18 can be suppressed and the engine can be supported stably.

  Furthermore, in the present embodiment, even when three openings 58 for inserting a member held by the cylinder head 16 through a spark plug or the like are formed in the head cover 18, for example, Rigidity is not reduced by the second rib 60 that connects the openings 58 in the cylinder row direction, and desired rigidity can be ensured.

  Furthermore, in the present embodiment, even if the opening 64 through which the OCV 62 is inserted is formed in the bulging portion 36 that supports the mount bracket M1, the peripheral edge portion 64a of the opening 64 and the boss portion 66 are connected. Rigidity is not reduced by the third rib 68, and desired rigidity can be ensured.

  Furthermore, when the mount bracket M1 that functions as the engine mount portion is attached to the head cover 18, the mating surface 24 (joint surface) between the head cover 18 and the cylinder head 16 is separated from each other by the mount input load input from the mount bracket M1. A force to try is generated. However, in this embodiment, since the cover member 26 is provided so as to cover both the mating surfaces 24 of the head cover 18 and the cylinder head 16, the mating surfaces 24 of the head cover 18 and the cylinder head 16 are coupled. The force to work can work and can hold | maintain the combined state of the mating surface 24 firmly.

  As a result, in this embodiment, when the mount input load acts on the mating surface 24 of the head cover 18 with the cylinder head 16, the cover member 26 fastened across the mating surface 24 with the head cover 18 and the cylinder head 16 is a rigid member. Therefore, it is possible to preferably avoid the occurrence of a gap between the mating surfaces 24 due to the mating surface 24 of the head cover 18 and the cylinder head 16 being opened (opened).

  Furthermore, in the present embodiment, the cover member 26 covers from one end to the other end of the mating surface 24 by setting the width dimension W2 of the cover member 26 so as to substantially match the entire width W1 of the mating surface 24. It is possible to prevent the mouth opening from occurring in substantially the entire range of the mating surface 24.

  Furthermore, in the present embodiment, by setting the width dimension W2 of the cover member 26 to substantially match the entire width W1 of the mating surface 24, the point (part) where the cover member 26 opens is one end of the mating surface 24. It is possible to separate from the other end to the other end, and mouth opening can be suppressed. If the width dimension W2 of the cover member 26 is set to be smaller than the total width W1 of the mating surface 24 (W1> W2), the parts of the mating surface 24 that are not covered by the cover member 26 need to be coupled by, for example, a fastening member or the like. In addition, the number of parts increases and a mouth opening may occur at a portion of the mating surface 24 that is not covered by the cover member 26.

  Furthermore, in the present embodiment, the mating surface 24 by the cover member 26 is set by setting the input direction of the mount input load from the mount bracket M1 and the side 34 provided on the cover member 26 to be substantially parallel. The holding power can be improved.

  Furthermore, in this embodiment, the lower part of the cylinder head 16 is connected to the cylinder block 20, so that the rigidity of the cylinder head 16 can be increased. By increasing the rigidity of the cylinder head 16, deformation of the cylinder block 20 can be suppressed even when a mount input load is input to the cylinder block 20.

  Furthermore, in this embodiment, the cover member 26 covers up to the head cover 18 and the cylinder head 16 and does not cover the cylinder block 20, thereby increasing the joining accuracy between the head cover 18 and the cylinder head 16 and increasing the coupling strength. Can be improved.

  Furthermore, in the present embodiment, the side walls 16a and 18a of the cylinder head 16 and the head cover 18 provided at the front end in the cylinder row direction are not separated from the cylinder head 16 and the head cover 18, but are respectively separated from the cylinder head 16 and the head cover 18. Rigidity can be provided by integral molding. Further, the lower end of the cylinder head 16 is integrally fastened to the upper end of the cylinder block 20 by fastening means such as a bolt, and a bag-like space (the upper portion of the timing train chamber) is formed between the side wall 16a of the cylinder head 16 and the cylinder head 16. ) Can be formed. In this case, by providing the side wall 16a of the cylinder head 16 that forms a space with the cylinder head 16, a fastening surface for the timing train cover (chain cover) 28 can be provided at the lower end of the cylinder head 16. It becomes.

  In the present embodiment, the V-type engine 10 is described. However, the present invention is not limited to this, and can be applied to, for example, an inline engine (not shown).

DESCRIPTION OF SYMBOLS 10 Engine 14 Transmission 16 Cylinder head 18 Head cover 19 Opening part 20 Cylinder block 23 Fastening hole (2nd fastening part)
24 mating surface 26 cover member 26a head cover covering portion 26b cylinder head covering portion 30 fastening bolt (second fastening member)
32 Fastening bolt (first fastening member)
36 bulging portion 37 inclined surface 40a, 40c flat surface (top surface, first fastening portion)
46a, 46b Body frame 52 Inclined surface portion 54 First rib 58 Opening 60 Second rib 62 Oil control valve 64 Opening (insertion hole)
66 Boss portion 68 Third rib A Cylinder axis O Crankshaft axis W1 Full width of mating surface W2 Cover member width T Tightening bolt axis M1 Mount bracket (engine mount portion, first engine mount portion)
M2 mount bracket (second engine mount)
PAI Inertia spindle G Engine center of gravity P1, P2 Fastening point

Claims (8)

The engine mount part for suspending the engine on the vehicle body frame is an engine head cover structure attached to the upper surface of the head cover that covers the valve mechanism,
The engine has a driving force transmission mechanism that transmits a driving force of a crankshaft to the valve mechanism on one end side in a cylinder row direction,
On one end side of the head cover in the cylinder row direction, a bulging portion that covers the upper side of the driving force transmission mechanism is provided,
The engine mount portion is attached to the bulge portion,
The bulging portion is provided with an inclined surface portion having an inclined surface that is inclined to fall toward the other end side in the cylinder row direction,
2. The engine head cover structure according to claim 1, wherein the inclined surface is formed so as to rise from an intermediate position in the cylinder row direction and to be continuous with the top surface of the bulging portion on one end side in the cylinder row direction. The engine head cover structure according to claim 1,
The head cover is formed with a first rib extending along the cylinder row direction,
An engine head cover structure, wherein one end side of the first rib is continuous with the bulging portion. The engine head cover structure according to claim 1 or 2,
An opening is formed in the side wall on one end side in the cylinder row direction of the bulging portion,
A cover member for closing the opening is provided;
A part of the cover member is fastened to the head cover, and the remaining part of the cover member is fastened to the cylinder head,
The bulging part of the head cover is provided with a first fastening part for fastening the engine mount part to the head cover,
The bulging portion of the head cover is further provided with a second fastening portion for fastening the cover member to the head cover,
A head cover structure for an engine, wherein a fastening direction of the first fastening portion and a fastening direction of the second fastening portion are substantially orthogonal to each other. The engine head cover structure according to claim 3,
The cover member has a head cover covering portion fastened to the head cover, and a cylinder head covering portion fastened to the cylinder head,
The engine head cover structure is characterized in that the cover member is fastened across a mating surface between the head cover and the cylinder head. The engine head cover structure according to claim 3 or 4,
A plurality of first fastening members fastened to the first fastening portion are provided apart in a direction intersecting the cylinder row direction,
At least one of the second fastening members fastened to the second fastening portion is located within a range between the axes of the first fastening members adjacent to each other. The head cover structure for an engine according to any one of claims 1 to 5,
The head cover is formed with at least two openings for inserting a member that is held through the head cover.
A head cover structure for an engine, wherein the head cover is provided with a second rib for connecting at least two of the openings in a cylinder row direction. The engine head cover structure according to claim 5,
The bulging portion is formed with an insertion hole through which the oil control valve is inserted,
A boss portion for fastening the first fastening member and / or the second fastening member is formed at one end portion in the cylinder row direction of the bulging portion so as to bulge inside the head cover.
3. A head cover structure for an engine, wherein an inner surface of the head cover is provided with a third rib for connecting a peripheral edge portion of the insertion hole and the boss portion. A vertically mounted V-type engine suspension structure mounted on the vehicle body frame so that the cylinder row is positioned along the vehicle longitudinal direction,
A driving force transmission mechanism that transmits the driving force of the crankshaft to the valve mechanism is provided so as to be positioned on the front side in the vehicle front-rear direction.
A first engine mount is fastened to the upper surface of the head cover that covers the valve mechanism of each bank,
A second engine mount is fastened to a transmission attached to the rear end side of the engine in the longitudinal direction of the vehicle,
A front first engine mount portion provided on the head cover and a rear second engine mount portion provided on the transmission are attached so as to be positioned on the inertia main shaft of the engine. The suspension structure of the V-type engine.

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