JP2010116020A - Engine support structure - Google Patents

Abstract

A structure for fastening a mount bracket to an engine cover such as a chain cover and using the mount bracket to support the engine on a vehicle body, the engine body and the engine body by means other than the fastening force of a fastener such as a bolt. Provided is an engine support structure capable of enhancing the sealing performance between mating surfaces with an engine cover.
The mating surface of the timing chain cover 10 and the engine side mounting bracket 2 is formed by inclined surfaces 22b, 23b, 24b, 10g, 10h, and 10i that are inclined toward the engine 1 side toward the lower side. The gravitational force acting on the engine 1 acts in a substantially horizontal direction, and the reaction force acts as a force for pressing the chain cover 10 toward the engine 1 side. For this reason, the sealing performance between the mating surfaces of the chain cover 10 and the cylinder block 11 and the cylinder head 12 is enhanced.
[Selection] Figure 6

Description

  The present invention relates to a support structure for an engine mounted on a vehicle. In particular, the present invention relates to an improvement in a structure for attaching a mount bracket to an engine cover and supporting the engine on a vehicle body using the mount bracket.

  Conventionally, as disclosed in, for example, Patent Documents 1 to 4 below, in a vehicle equipped with an engine (internal combustion engine), vibrations generated due to engine driving force fluctuations are transmitted to the vehicle body. In order to prevent this, the engine is elastically supported by the engine mount. Specifically, for example, the engine side mounting bracket is provided on the engine, and the vehicle body side mounting bracket is provided on the vehicle body (for example, a side member), and these brackets are connected to each other by means such as bolting, and the engine is mounted on each mount. It is elastically supported on the vehicle body via a bracket.

  In such an engine support structure, for example, a timing chain cover (hereinafter sometimes simply referred to as a chain cover) that forms a space for accommodating a timing chain, a sprocket, and the like is provided as an installation location of the engine side mounting bracket. The outer surface is mentioned. That is, the engine side mounting bracket is integrally fastened to the outer surface of the chain cover by means such as bolting. Then, the chain cover portion is elastically supported by the vehicle body by integrally connecting the engine side mount bracket and the vehicle body side mount bracket fastened to the vehicle body side by means such as bolts. I am doing so.

  The chain cover is made of metal (for example, aluminum) or synthetic resin, and forms an accommodation space for the timing chain and sprocket with the engine body (cylinder block or cylinder head) as described above. . For this reason, a sealing material (for example, FIPG: Formed In Place Gasket) is provided between the mating surfaces of the engine body and the chain cover so that oil that lubricates between the timing chain and the sprocket does not leak to the outside. Is intervened.

In addition, since the engine is supported by the vehicle body at a plurality of locations, the engine support structure using the mounting bracket as described above is applied not only between the chain cover and the vehicle body but also between the cylinder block and the vehicle body. Has been.
Japanese Patent Laid-Open No. 2007-113411 Japanese Patent Laid-Open No. 10-47157 JP-A-7-259578 Japanese Utility Model Publication No. 5-89845

  As described above, the chain cover is provided with a predetermined sealant between the engine body and the cylinder block or cylinder head so that oil does not leak from the timing chain and sprocket housing space. It is assembled by such means. For this reason, until now, securing the sealing performance of the seal portion to which the above-described sealing material is applied has to rely on bolt fastening force (bolt fastening force that presses the chain cover toward the cylinder block or the cylinder head). There wasn't.

  The inventors of the present invention have studied a configuration that can enhance the sealing performance by means other than the bolt fastening force in order to further improve the sealing performance of the sealing portion.

  The present invention has been made in view of such a point, and an object of the present invention is to fasten a mount bracket to an engine cover such as a chain cover and to support the engine on the vehicle body using the mount bracket. An object of the present invention is to provide an engine support structure capable of improving the sealing performance between the mating surfaces of the engine body and the engine cover by means other than the fastening force of a fastener such as a bolt.

-Principle of solving the problem-
The solution principle of the present invention devised to achieve the above object is that the component of gravity acting on the engine acts on the mount bracket via the engine cover with respect to the mount bracket fastened to the engine cover. The engine cover is pressed toward the engine body side by the reaction force of the component force acting on the mount bracket. That is, the structure which improves the sealing performance between the joint surfaces of an engine main body and an engine cover using the said gravity is implement | achieved.

-Solution-
Specifically, according to the present invention, a mounting bracket is attached to the outer surface of the engine cover that is assembled to the side of the engine main body and extends in the substantially vertical direction, and the mounting bracket is connected to the vehicle body side to thereby connect the engine to the vehicle body side. Assumes a supporting engine support structure. With respect to this engine support structure, the overlapping surface on which the mount bracket and the engine cover are overlapped with each other has an inclined surface that inclines toward the engine body as it goes downward.

  With this specific matter, when the engine is supported on the vehicle body side by connecting the mount bracket attached to the outer surface of the engine cover to the vehicle body side, the overlapping surface (inclined surface) of the mount bracket and the engine cover is Inclining toward the engine body as it goes downward. For this reason, the component force of gravity (downward force) acting on the engine acts on the overlapping surface, and becomes a force for pressing the mount bracket toward the vehicle body in a substantially horizontal direction. On the other hand, since the vehicle body side is a highly rigid structure such as a vehicle body frame, for example, the force that presses in the substantially horizontal direction (component force of gravity) is the reaction that presses the mount bracket toward the engine cover side. Generate power. This reaction force acts as a force for pressing the engine cover toward the engine body. As a result, the engine cover is pressed against the engine body, and the sealing performance between the mating surfaces of the engine cover and the engine body is enhanced. In this way, in this solution, it is possible to improve the sealing performance between the mating surfaces of the engine cover and the engine body by utilizing the gravity acting on the engine, and conventionally fastening fasteners such as bolts The sealing performance between the mating surfaces that relied solely on the force can be greatly improved. Further, since it is not necessary to add a new member as a configuration for improving the sealing performance, the assembly work accompanying the increase in the number of parts, the increase in weight, and the increase in cost are not caused.

  Specific examples of the mounting bracket mounting portion with respect to the engine cover include the following. In other words, a plurality of bracket-side boss portions having bolt through holes formed in the mount bracket, while a plurality of cover-side boss portions having bolt through holes at positions corresponding to the bracket-side boss portions in the engine cover are formed. Form. Further, the mount bracket is attached to the engine cover by inserting the bolt through the bolt through hole of the mount bracket and the bolt through hole of the engine cover in alignment. And the inclined surface which inclines toward the engine main body side toward the said lower side is formed in each of the end surface which faces the engine cover side in the said bracket side boss part, and the end surface which faces the mount bracket side in the cover side boss part. Yes.

  Thereby, the said inclined surface can be formed using the cover side boss | hub part and the bracket side boss | hub part in which the bolt through-hole for attaching a mount bracket to an engine cover was formed. In other words, it is no longer necessary to design a new protrusion or the like for providing the inclined surface on the mount bracket or the engine cover, and no significant design change is required for the conventional mount bracket or engine cover. The practicality of the present invention can be improved.

  Specifically, the engine cover described in each of the above solutions is a timing chain cover that covers the arrangement space of the timing chain for transmitting the rotational force of the crankshaft of the engine to the camshaft. The timing chain cover is assembled to the engine body via a seal material.

  By applying the configuration according to each solution described above to the timing chain cover, it is possible to obtain a configuration with high sealing performance that can reliably prevent leakage of oil that lubricates the timing chain.

  Specific examples of the shape of the bolt through-hole formed in the bracket-side boss and the cover-side boss include the following. In other words, each axis of the bolt through hole formed in the bracket side boss portion of the mount bracket and the bolt through hole formed in the cover side boss portion of the engine cover extends in a direction perpendicular to the inclined surface. It has a configuration.

  That is, the axis of each bolt through hole is inclined upward rather than toward the engine cover rather than in the horizontal direction. According to this configuration, since the opening shape of the bolt through hole on each inclined surface of the mount bracket and the engine cover is a substantially perfect circle, alignment of these bolt through holes and insertion of the bolts across these bolt through holes are possible. Can be easily performed, and the assembly work of the mounting bracket to the engine cover becomes easy.

  In the present invention, the overlapping surface on which the mount bracket and the engine cover are overlapped with each other is an inclined surface that inclines toward the engine main body as it goes downward, so that it counteracts against the gravitational force acting on the engine. The force acts as a force for pressing the engine cover toward the engine body. For this reason, the sealing performance between the mating surfaces of the engine cover and the engine body can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. This embodiment demonstrates the case where this invention is applied to the timing chain cover of the engine for motor vehicles.

-Peripheral structure of timing chain cover-
Before describing the engine support structure that is a feature of the present embodiment, the structure of the peripheral portion of the timing chain cover will be described.

  FIG. 1 is a perspective view of a DOHC engine having a VVT (Variable Valve Timing) mechanism. A timing chain cover (engine cover in the present invention) 10 and a timing chain 7 are removed from a cylinder block 11 and a cylinder head 12. Shows the state.

  A cylinder head 12 is attached to the upper part of the cylinder block 11, and an oil pan 14 is attached to the lower part of the cylinder block 11 via a crankcase 13. The cylinder block 11 and the cylinder head 12 constitute an engine body referred to in the present invention.

  The cylinder block 11 and the cylinder head 12 are made of iron (cast iron), aluminum, magnesium, or an alloy containing these. The cylinder block 11 and the cylinder head 12 are fastened by a plurality of bolts via a gasket (metal gasket or liquid gasket) (not shown).

  An intake camshaft 4 and an exhaust camshaft 5 are disposed in the cylinder head 12. As shown in FIG. 2, the crankshaft 6 is disposed in the crankcase 13.

  Hereinafter, a camshaft drive mechanism for rotating the camshafts 4 and 5 will be described.

  This camshaft drive mechanism is connected to the first crank sprocket 61, which is integrally connected to one shaft end of the crankshaft 6, and one shaft end of the intake camshaft 4 of the cylinder head 12 to be integrally connected. The intake cam sprocket 4a, the exhaust cam sprocket 5a rotatably connected to one end of the exhaust cam shaft 5 of the cylinder head 12, and the first crank sprocket 61 and the cam sprockets 4a, 5a A timing chain 7 is provided, which is wound around and rotates each cam sprocket 4a, 5a by driving rotation of the first crank sprocket 61.

  The intake camshaft 4 is provided with a VVT mechanism for adjusting the operation timing of the intake valve. This VVT mechanism is controlled by an engine ECU (Electronic Control Unit) (not shown) to adjust the valve overlap or the like by advancing or retarding the operation timing of the intake valve so that desired engine characteristics can be obtained. I have to.

  An oil pump drive mechanism for rotationally driving the oil pump 8 by the crankshaft 6 is provided below the camshaft drive mechanism. This oil pump drive mechanism includes a second crank sprocket 62 that is integrally connected to the crankcase 13 side (right side in FIG. 2) of the crankshaft 6 with respect to the first crank sprocket 61, and one shaft end of the oil pump 8. An oil pump sprocket 81 that is integrally connected to the oil pump, and an oil pump drive chain that is wound around the second crank sprocket 62 and the oil pump sprocket 81 and that causes the oil pump sprocket 81 to be driven to rotate by driving rotation of the second crank sprocket 62. 71.

  The camshaft drive mechanism and the oil pump drive mechanism configured as described above are covered from the outside by the timing chain cover 10 attached to the front side (one end face side) of the cylinder head 12, the cylinder block 11, and the crankcase 13. The timing chain cover 10 is housed in the internal space. The timing chain cover 10 is formed using iron (cast iron), aluminum, magnesium, or an alloy containing these as a raw material.

  In FIG. 1, 72 is a chain tensioner device for adjusting the tension of the timing chain 7, and 73 is a guide for the stretched portion of the timing chain 7 located between the exhaust cam sprocket 5a and the first crank sprocket 61. It is a chain vibration damper.

  Oil (engine oil) for lubricating the timing chain 7 and the oil pump drive chain 71 is circulated in a space formed inside the timing chain cover 10. Therefore, a liquid gasket is provided as a seal member on the end surface of the timing chain cover 10 and on the joint surface between the cylinder head 12 and the cylinder block 11. By this liquid gasket, oil leakage from the outer edge portion of the timing chain cover 10 is avoided.

  An engine side mount bracket 2 for suspending the engine 1 on the chassis is fastened to the timing chain cover 10. The material of the engine side mounting bracket 2 is highly rigid iron (cast iron).

  The engine side mounting bracket 2 is fastened to the upper side surface of the timing chain cover 10 by a plurality of bolts 51, 51,... And is fastened to the cylinder head 12 and the cylinder block 11. Details of the configuration of the engine side mounting bracket 2 will be described later.

  As shown in FIG. 2, one shaft end of the crankshaft 6 protrudes outward from the timing chain cover 10 and drives various accessories (alternator, compressor for air conditioner, etc.) by belt transmission. A crank pulley 63 is attached integrally with the rotation. Further, reference numeral 9 in FIG. 1 denotes a water pump, and the water pump 9 is also driven by the rotational force of the crankshaft 6 to perform the circulating operation of the cooling water.

-Engine support structure-
Next, an engine support structure using the engine-side mount bracket 2 that is a characteristic feature of the present embodiment will be described.

  FIG. 3 is an exploded perspective view showing a fastening portion of the engine side mount bracket 2 and the vehicle body side engine mount 3 with respect to the timing chain cover 10.

  As shown in FIG. 3, the engine 1 is elastically supported by the vehicle body (side member 70: see FIG. 6) via the engine side mount bracket 2 and the vehicle body side engine mount 3. Hereinafter, configurations of the engine side mount bracket 2 and the vehicle body side engine mount 3 will be described.

-Engine side mounting bracket-
The configuration of the engine side mounting bracket 2 will be described with reference to FIGS.

  The engine-side mount bracket 2 is a member that is attached to the upper part of the side surface of the chain cover 10 of the engine 1. The bracket main body 21 and the left and right sides of the bracket main body 21 (front and rear of the vehicle: a direction substantially orthogonal to the paper surface in FIG. 3). Lower boss portions 22 and 23 provided on both sides, a vertical wall 25 extending obliquely upward from one end portion of the bracket body 21 (end portion on the lower boss portion 22 side), and an upper boss provided on the upper end portion of the vertical wall 25 The part 24, the protective wall 20 and the like are integrally formed.

  The left and right lower boss portions 22 and 23 and the upper boss portion 24 of the bracket main body 21 are members for fixing the entire engine-side mount bracket 2 to the upper portion of the chain cover 10, and each boss portion 22, 23, 24. Are provided with bolt through holes 22a, 23a, 24a, respectively.

  As shown in FIG. 3, the chain cover 10 has outer side (engine-side mounting brackets 2 at positions corresponding to the left and right lower boss portions 22, 23 and the upper boss portion 24 of the bracket body 21. Boss portions 10d, 10e, 10f projecting toward the mounting side) are provided, and bolt through holes 10a, 10b, 10c are also formed in these boss portions 10d, 10e, 10f.

  For this reason, the boss portions 22, 23, 24 of the engine side mounting bracket 2 are overlapped with the boss portions 10d, 10e, 10f of the chain cover 10, and the bolt through holes 22a, 10a, 23a, 10b, 24a, 10c are connected to each other. Are aligned, and the bolts 51, 51, 51 are inserted through the bolt through holes 22a, 10a, 23a, 10b, 24a, 10c, and the bolts 51, 51, 51 are inserted into the cylinder block 11 and the cylinder head. The entire engine-side mount bracket 2 can be fixed to the upper part of the chain cover 10 by being screwed into the female screw hole formed in 12.

  A positioning hole 21 a is provided in a substantially central portion of the bracket body 21. The positioning hole 21a is a through-hole having a size that can be fitted into a stud pin 33a of a vehicle body side engine mount 3 to be described later. By fitting the positioning hole 21a into the stud pin 33a, an engine side mounting bracket is mounted. 2 (engine 1) and vehicle body side engine mount 3 can be positioned in the vehicle left-right direction. The substantially upper half of the positioning hole 21a is processed into a conical taper shape whose diameter increases toward the upper side, so that the fitting property with the stud pin 33a of the vehicle body side engine mount 3 is enhanced.

  The bracket body 21 is provided with female screw holes 21b and 21b on both sides of the positioning hole 21a (both sides in the longitudinal direction of the vehicle). The positional relationship between the positioning holes 21a and the female screw holes 21b and 21b on both sides thereof corresponds to the positional relationship between stud pins 33a of the vehicle body side engine mount 3 described later and bolt through holes 33b and 33b on both sides thereof.

  And the protective wall 20 is integrally formed in the bracket main body 21 in the position which becomes the engine 1 side with respect to the positioning hole 21a. The protective wall 20 is a wall body that rises from the bracket body 21 toward the upper side of the positioning hole 21a, and in a state where the engine side mounting bracket 2 is attached to the chain cover 10 (the state shown in FIG. 6), the positioning hole 21a. A protective wall 20 is arranged between the chain cover 10 and the chain cover 10. The surface 20a on the positioning hole 21a side of the protective wall 20 is an inclined surface that inclines downward from the engine 1 side toward the positioning hole 21a.

  And as one of the features of this embodiment, the end face on the chain cover 10 side of each boss portion 22, 23, 24 of the engine side mounting bracket 2 is inclined toward the chain cover 10 side as it goes downward. It is formed by inclined surfaces 22b, 23b, and 24b. More specifically, the engine side mounting bracket 2 is erected so that the axial center of each of the bolt through holes 22a, 23a, 24a is horizontal (the state shown in FIGS. 3 and 4C). Thus, the end surfaces on the chain cover 10 side of the boss portions 22, 23, 24 are formed as inclined surfaces 22 b, 23 b, 24 b that are inclined toward the chain cover 10 side toward the lower side.

  These inclined surfaces 22b, 23b, and 24b are inclined at an inclination angle of, for example, about 30 ° with respect to the vertical direction. This value is not limited to this, and can be set arbitrarily.

  The chain cover 10 corresponds to the inclined surfaces 22b, 23b, 24b, and the end faces of the boss portions 10d, 10e, 10f in which the bolt through holes 10a, 10b, 10c are formed in the chain cover 10 are also directed downward. It is formed of inclined surfaces 10g, 10h, and 10i that are inclined toward the 10 side (engine 1 side). More specifically, each boss portion 10d, 10e in a state where the chain cover 10 is erected (the state shown in FIG. 3) so that the axial centers of the bolt through holes 10a, 10b, 10c are horizontal. , 10f are formed as inclined surfaces 10g, 10h, 10i that are inclined toward the chain cover 10 side (engine 1 side) toward the lower side.

  The inclination angles of the inclined surfaces 10g, 10h, and 10i are also inclined, for example, by about 30 ° with respect to the vertical direction. This value is not limited to this, and can be arbitrarily set. However, it is preferable that the values substantially coincide with the inclination angles of the inclined surfaces 22b, 23b, 24b of the engine-side mount bracket 2.

  With such a configuration, in the state where the engine side mount bracket 2 is overlapped at a predetermined position with respect to the chain cover 10 as described above, the inclined surfaces 22b of the boss portions 22, 23, 24 of the engine side mount bracket 2 are provided. 23b, 24b and the inclined surfaces 10g, 10h, 10i of the boss portions 10d, 10e, 10f of the chain cover 10 are overlapped with each other, and the bolt through holes 22a, 23a, 24a on the chain cover 10 side The bolt through holes 10a, 10b, 10c on the chain cover 10 side are formed as continuous holes. Bolts 51, 51, 51 are respectively inserted into these holes and screwed into female screw holes formed in the cylinder block 11 and the cylinder head 12, whereby the engine side mounting bracket 2 is connected to the chain cover 10. Will be.

-Vehicle side engine mount-
The configuration of the vehicle body side engine mount 3 will be described with reference to FIGS.

  The vehicle body side engine mount 3 is mainly composed of a frame 31, a mount rubber (insulator) 32, a vehicle body side mount bracket 33, and mounting legs 34.

  The frame 31 is a member in which an upper plate 31a and a pair of side plates 31b and 31c extending downward from both ends of the upper plate 31a are integrally formed. A mounting leg 34 is integrally formed at the lower part of the frame 31, and is mounted in a space (rectangular opening) surrounded by the bottom plate 34a of the mounting leg 34, the upper plate 31a of the frame 31 and the side plates 31b and 31c. A rubber 32 is accommodated. The mounting leg 34 is provided with bolt through holes 34b and 34b on both sides of the frame 31, respectively.

  The mount rubber 32 is a substantially rectangular ring-shaped elastic body in which a rectangular through hole 32a is formed in a substantially central portion, and is accommodated in a space surrounded by the frame 31 and the bottom plate 34a of the mounting leg 34. The through hole 32a is disposed along a direction substantially orthogonal to the bottom plate 34a of the mounting leg 34 (a direction substantially orthogonal to a plane passing through the centers of the two bolt through holes 34b and 34b).

  The vehicle body side mount bracket 33 is a member connected to the engine side mount bracket 2 described above, and the bracket base portion is inserted into the through hole 32 a of the mount rubber 32.

  The stud pin 33a (for example, made of an iron-based material) is provided at the distal end portion of the vehicle body side mounting bracket 33. The stud pin 33 a is a member that can be fitted into the positioning hole 21 a of the engine-side mount bracket 2 described above, and extends downward from the center of the front end portion of the vehicle body-side mount bracket 33. The stud pin 33a is implanted by screwing a male screw formed at the upper end of the stud pin 33a into a female screw hole of the vehicle body side mounting bracket 33.

  The vehicle body side mounting bracket 33 is provided with bolt through holes 33b and 33b on both sides of the stud pin 33a. The positional relationship between the stud pin 33a and the bolt through holes 33b and 33b on both sides thereof corresponds to the positional relationship between the positioning hole 21a of the engine-side mount bracket 2 and the female screw holes 21b and 21b on both sides as described above.

  According to the vehicle body side engine mount 3 having the above structure, since the vehicle body side mounting bracket 33 is connected to the frame 31 and the mounting leg 34 via the mount rubber 32, an engine mounting state (state shown in FIG. 6) to be described later. Thus, the engine 1 is elastically supported by the vehicle body (side member 70) via the engine side mount bracket 2 and the vehicle body side engine mount 3, and the vibration of the engine 1 is absorbed by the mount rubber 32. This can prevent the engine vibration from being transmitted to the vehicle body.

-Engine mounting method-
Next, an example of a mounting method for mounting the engine 1 on a vehicle will be described with reference to FIGS. 3 and 6.

  (1) First, the engine side mounting bracket 2 is attached to the upper part of the chain cover 10. Specifically, as described above, the bolt through holes 22a, 23a, 24a of the lower boss portions 22, 23 and the upper boss portion 24 of the engine side mounting bracket 2 are connected to the bolt through holes 10a, 10b, In a state of being aligned with 10c, bolts 51, 51, 51 are inserted through the respective through holes 22a, 10a, 23a, 10b, 24a, 10c, and the bolts 51, 51, 51 are inserted into the cylinder block 11 and the cylinder. The engine side mount bracket 2 is fixed to the chain cover 10 by screwing into a female screw hole formed in the head 12.

  With the engine-side mount bracket 2 attached to the chain cover 10 in this manner, the positioning hole 21a of the engine-side mount bracket 2 and the chain cover 10 are separated by the protective wall 20.

  On the other hand, with respect to the vehicle body side engine mount 3, the entire vehicle body side engine mount 3 is mounted on the vehicle body by fixing the mounting legs 34 of the frame 31 to the vehicle body (side member 70) using bolts 52.

  (2) The engine 1 is moved by a mounting device such as an engine hanger, and the positioning hole 21a of the engine side mounting bracket 2 is disposed below the vehicle body side mounting bracket 33. Next, the positioning hole 21a and the vehicle body side mounting bracket 33 are While positioning with the stud pin 33a, the engine 1 is raised and the positioning hole 21a is fitted into the stud pin 33a, thereby positioning the engine 1 with respect to the vehicle body side engine mount 3 (positioning in the vehicle lateral direction). .

  In this state, the engine side mount bracket 2 and the vehicle body side mount bracket 33 are connected to each other by using bolts 53 (see FIG. 3), whereby the engine 1 is connected to the engine side mount bracket 2 and the vehicle body side engine mount. 3 is elastically supported by the vehicle.

  In a state where the engine 1 is supported on the vehicle body side through the engine side mounting bracket 2 assembled to the outer surface of the chain cover 10 in this way, the boss portions 22, 23, 24 of the engine side mounting bracket 2 and the chain Overlapping surfaces (the aforementioned inclined surfaces 22b, 23b, 24b, 10g, 10h, and 10i) of the boss portions 10d, 10e, and 10f of the cover 10 are inclined toward the engine 1 side toward the lower side. .

  Therefore, the gravitational force (downward force) acting on the engine 1 acts between the inclined surfaces 22b, 10g, 23b, 10h, 24b, 10i, which are the overlapping surfaces, and the engine side mounting bracket. This is a force that pushes 2 toward the vehicle body side in a substantially horizontal direction (left direction in FIG. 6). On the other hand, since the vehicle body side is a highly rigid structure such as the side member 70, the force that presses in the substantially horizontal direction (component of gravity) causes the engine side mounting bracket 2 to move toward the chain cover 10 side. A reaction force (refer to an arrow F in FIG. 6) that presses toward is generated. The reaction force acts as a force that presses the chain cover 10 toward the engine 1 (the cylinder block 11 and the cylinder head 12).

  As a result, the chain cover 10 is pressed against the cylinder block 11 and the cylinder head 12, and the sealing performance between the mating surfaces of the chain cover 10 and the cylinder block 11 and the cylinder head 12 is enhanced.

  Thus, in this embodiment, it is possible to improve the sealing performance between the mating surfaces of the chain cover 10, the cylinder block 11, and the cylinder head 12 by using the gravity acting on the engine 1. For this reason, conventionally, the sealing performance between the mating surfaces, which has depended only on the fastening force of a fastener such as a bolt, can be greatly enhanced by utilizing the gravity. Further, since it is not necessary to add a new member as a configuration for improving the sealing performance, the assembly work accompanying the increase in the number of parts, the increase in weight, and the increase in cost are not caused.

(Modification)
Next, a modified example of the present invention will be described. In the embodiment described above, the axial direction (fastening direction) of the bolt 51 for fastening the engine side mounting bracket 2 to the cylinder block 11 and the cylinder head 12 via the chain cover 10 is the horizontal direction. In this modification, the fastening direction of the bolt 51 is different from that of the above embodiment. Therefore, only the differences from the above embodiment will be described here.

  FIG. 7 is a view showing a fastening portion of the engine side mounting bracket 2 in the present modification. As shown in FIG. 7, in this modified example, the shaft center of the female screw holes 11a and 12a formed in the cylinder block 11 and the cylinder head 12 for attaching the chain cover 10 and the engine-side mount bracket 2, the chain Inclinations in which the shaft centers of the bolt through holes 10b and 10c formed in the cover 10 and the shaft centers of the bolt through holes 23a and 24a formed in the engine side mount bracket 2 are formed in the engine side mount bracket 2, respectively. The surfaces 24b and 23b and the inclined surfaces 10i and 10h formed on the chain cover 10 are inclined so as to be orthogonal to each other. That is, each hole 10b, 10c, 23a, 24a is formed as an inclined hole inclined upward toward the engine 1 side. In FIG. 7, only two fastening locations of the bolt 51 are shown. However, as in the case of the above-described embodiment, there is another fastening location on the back side of the paper surface, and the chain cover 10 On the other hand, the engine side mounting bracket 2 is attached at three locations.

  According to the configuration of this modification, the shapes of the bolt through holes 23a, 24a, 10b, 10c opened to the inclined surfaces 23b, 24b, 10h, 10i of the engine-side mount bracket 2 and the chain cover 10 are substantially perfect circles. Therefore, it is possible to easily align the bolt through holes 23a, 10b, 24a, and 10c and to insert the bolts 51 and 51 over the bolt through holes 23a, 10b, 24a, and 10c. The assembly work of the engine side mounting bracket 2 to the cover 10 is facilitated.

  Other configurations and operational effects are the same as those of the above-described embodiment.

-Other embodiments-
The shapes of the engine-side mount bracket 2 and the vehicle body-side engine mount 3 are not limited to those of the above-described embodiment and modified examples. For example, in the above-described embodiment, the protective wall 20 is provided as a protective member on the engine-side mount bracket 2, but the protective wall 20 is not always necessary.

  In the above embodiment, the vehicle body side engine mount 3 is of a type that absorbs vibration with the mount rubber 32, but is not limited thereto, and other types of engines such as a fluid-filled engine mount are used. Mounts may be applied.

  In the above-described embodiment and the modification, the example in which the present invention is applied to the engine 1 mounted on the FF (front engine / front drive) type vehicle is shown. However, the present invention is not limited to this, and the FR (front engine) -It can also be applied to engines mounted on rear drive type vehicles and four-wheel drive vehicles.

  Further, the present invention can be applied to other in-vehicle engines such as diesel engines in addition to gasoline engines. Furthermore, the present invention is also applicable to various types of in-vehicle engines such as an inline engine, a V engine, and a horizontally opposed engine.

  Further, in the embodiment and the modification described above, the case where the present invention is applied to the timing chain cover 10 as the engine cover has been described. The present invention is not limited to this and can be applied to a cylinder head cover.

  Further, the present invention is applicable not only to automobile engines but also to engine covers for engines used for other purposes.

  Further, the timing chain cover 10 is not limited to being made entirely of metal, but may be composed of a composite material of metal (for example, aluminum) and synthetic resin (for example, nylon resin).

  In addition, in the embodiment and the modification described above, the inclination angles of the plurality of inclined surfaces 22b, 23b, and 24b provided in the engine-side mount bracket 2 are all the same angle. The present invention is not limited to this, and the inclined surfaces 22b, 23b, and 24b may have different inclination angles. In this case, since the inclination angles of the plurality of inclined surfaces 10g, 10h, 10i provided on the timing chain cover 10 also need to be set to angles corresponding to the respective inclined surfaces 10g. , 10h, 10i have different inclination angles.

  Further, end faces 22b, 23b, 24b on the timing chain cover 10 side of the boss parts 22, 23, 24 of the engine side mount bracket 2 and end faces on the engine side mount bracket 2 side of the boss parts 10d, 10e, 10f of the timing chain cover 10 10g, 10h, and 10i do not need to be inclined as a whole, and it is possible to obtain the operational effects of the present invention even when a part is an inclined surface and the other part is a vertical surface. .

It is a perspective view of the engine which shows the state which removed the timing chain cover, the engine side mount bracket, etc. from the cylinder block and the cylinder head. It is a side view of an engine which shows a timing chain cover and its circumference in a section. It is a disassembled perspective view for demonstrating the fastening operation | work of each mount bracket with respect to a timing chain cover and an engine. FIG. 4A is a front view, FIG. 4B is a plan view, and FIG. 4C is a cross-sectional view taken along the line CC in FIG. 4A. It is. FIG. 5A is a front view, FIG. 5B is a plan view, and FIG. 5C is a side view. It is a side view which shows the state by which the engine was supported by the vehicle body side by the engine side mount bracket and the vehicle body side mount bracket. In a modification, it is a side view showing the state where the engine was supported by the body side by the engine side mounting bracket and the body side mounting bracket.

Explanation of symbols

1 Engine 2 Engine side mounting bracket 4 Intake camshaft 5 Exhaust camshaft 6 Crankshaft 7 Timing chain 10 Timing chain cover (engine cover)
10a, 10b, 10c Bolt through holes 10d, 10e, 10f Cover side bosses 10g, 10h, 10i Overlapping surfaces (inclined surfaces) of timing chain cover
11 Cylinder block (engine body)
12 Cylinder head (engine body)
22, 23, 24 Boss (Bracket side boss)
22a, 23a, 24a Bolt through holes 22b, 23b, 24b Overlapping surfaces (inclined surfaces) of the engine side mounting bracket
51 Bolt 70 Side member (vehicle body side)

Claims (4)

In the engine support structure for supporting the engine on the vehicle body side by attaching a mount bracket to the outer surface of the engine cover assembled on the side of the engine body and extending in the substantially vertical direction, and connecting the mount bracket to the vehicle body side,
An engine support structure, wherein an overlapping surface on which the mount bracket and the engine cover are overlapped with each other has an inclined surface that inclines toward the engine body as it goes downward. The engine support structure according to claim 1,
The mount bracket has a plurality of bracket side boss portions with bolt through holes formed therein, while the engine cover has a plurality of cover sides having bolt through holes at positions corresponding to the bracket side boss portions. A boss is formed, and the mount bracket can be attached to the engine cover by inserting bolts into the bolt through hole of the mount bracket and the bolt through hole of the engine cover aligned with each other. ,
The inclined surfaces that incline toward the engine body as they go downward are formed on the end surface facing the engine cover side of the bracket-side boss portion and the end surface facing the mount bracket side of the cover-side boss portion, respectively. Engine support structure characterized by The engine support structure according to claim 1 or 2,
The engine cover is a timing chain cover that covers an arrangement space of the timing chain for transmitting the rotational force of the crankshaft of the engine to the camshaft, and is assembled to the engine body via a sealing material. Engine support structure characterized by The engine support structure according to claim 2,
Each axis of the bolt through hole formed in the bracket side boss portion of the mount bracket and the bolt through hole formed in the cover side boss portion of the engine cover extends in a direction orthogonal to the inclined surface. An engine support structure characterized by that.

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