JP2020006761A - Support structure of internal combustion engine - Google Patents

Abstract

To inhibit vibration of a mount bracket which connects an internal combustion engine with a vehicle body member.SOLUTION: A support structure of an internal combustion engine has: an internal combustion engine (2); a vehicle body member (8); and a mount bracket (5) which supports the internal combustion engine on the vehicle body member. The internal combustion engine has: an internal combustion engine body (3); and a cover member (10) jointed to a joint surface facing a vehicle body member (8) side. The cover member has: a body part (11); and an expansion part (12) which expands to the vehicle body member side further than the body part. The expansion part has: a lateral wall part (12A) extending to the vehicle body member (8) side further than the body part (11); and a vertical wall part (12B) extending in a vehicle vertical direction and connected to a vehicle body member (8) side end part of the lateral wall part. A first cover fastening part (18) to which the mount bracket is fastening is provided at an upper part of the lateral wall part. A second cover fastening part (16) to which a lower part of the mount bracket is fastened is provided at the vertical wall part.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a support structure for an internal combustion engine that supports the internal combustion engine on a vehicle body member.

  2. Description of the Related Art A support structure for an internal combustion engine including an internal combustion engine, a vehicle body member, and a mount bracket that supports the internal combustion engine on the vehicle body member is known (for example, Patent Document 1). The internal combustion engine includes an internal combustion engine main body, and a cover member joined to a surface of the internal combustion engine main body on the side of the vehicle body member.

  The cover member of Patent Literature 1 has a main body and a bulging portion that swells in a direction away from the internal combustion engine (a direction approaching the vehicle body member) than the main body. The cover member includes a first fastening portion disposed on an upper surface of the bulging portion and fastening the upper portion of the mount bracket, and a second fastening portion disposed on an inclined surface below the bulging portion and fastening the lower portion of the mount bracket. And

JP 2017-100567 A

  The second fastening portion of Patent Literature 1 includes a boss having a hole into which the fastening member is inserted, and protrudes outward from the inclined surface. The inclined surface is inclined so as to move away from the vehicle body member side toward the lower side of the bulging portion. Therefore, the boss of the second fastening portion protrudes toward the vehicle body member from the inclined surface of the bulging portion. Therefore, the boss of the second fastening portion may vibrate in the vertical direction of the vehicle, and vibration from the internal combustion engine may be easily transmitted to the vehicle body member via the mount bracket.

  Further, in the case of an internal combustion engine in which cylinders are arranged horizontally so as to be arranged in the vehicle width direction, downsizing may be attempted by reducing the number of cylinders from the viewpoint of improving fuel efficiency of the internal combustion engine. At this time, since the distance between the vehicle body member and the internal combustion engine becomes long, unless the coupling rigidity of the mount bracket to the cover member is increased, vibration from the internal combustion engine may be easily transmitted to the vehicle body member via the mount bracket. was there.

  In view of such circumstances, an object of the present invention is to provide a support structure for an internal combustion engine in which vibration of the mount bracket is suppressed and vibration from the internal combustion engine is hardly transmitted to a vehicle body member.

  The support structure for an internal combustion engine according to one aspect is a support structure for an internal combustion engine having an internal combustion engine, a vehicle body member, and a mount bracket that supports the internal combustion engine on the vehicle body member. A cover member joined to a joint surface of the internal combustion engine main body facing the vehicle body member, wherein the cover member swells toward the body member side with respect to the main body and the main body. The bulging portion has a horizontal wall portion extending from the main body portion toward the vehicle body member, and a vertical wall portion extending in a vehicle vertical direction and connected to an end of the horizontal wall portion. A first fastening portion to which an upper portion of the mount bracket is fastened, and a second fastening portion to which a lower portion of the mount bracket is fastened, is provided at an upper portion of the horizontal wall portion. I have.

  The cover member has a main body and a bulging portion, and the bulging portion is provided with a first fastening portion and a second fastening portion. By providing the first fastening portion and the second fastening portion on the swelling portion which is larger in size and higher in rigidity than the conventional swelling portion, the cover member and the mounting bracket can be firmly connected, and the vibration of the mounting bracket can be suppressed. . Further, the second fastening portion is provided on the vertical wall portion extending at the end of the bulging portion and extending in the vehicle vertical direction by increasing the length of the bulging portion extending toward the body member. Vibration of the two fastening portions in the vehicle vertical direction can be suppressed. Therefore, the vibration of the entire support structure of the internal combustion engine in the vertical direction of the vehicle can be suppressed, and the transmission of the vibration from the internal combustion engine to the vehicle body member can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the vibration of a mount bracket can be suppressed and the vibration from an internal combustion engine can be made difficult to transmit to a vehicle body member.

FIG. 1 is a plan view of a support structure for an internal combustion engine according to the embodiment. FIG. 2 is a rear view of the cover member and the mount bracket as viewed in the direction of arrow A shown in FIG. FIG. 3 is an outer side view of the cover member and the first mount bracket according to the embodiment as viewed from the vehicle body member side. FIG. 4 is an inner side view of the cover member and the first mount bracket according to the embodiment as viewed from the internal combustion engine side. FIG. 5 is a side view of the cover member according to the embodiment as viewed from the outside in the vehicle width direction. FIG. 6 is a cross-sectional view along the 6A-6A cross section shown in FIG. FIG. 7 is a cross-sectional view along the 7A-7A cross section shown in FIG. FIG. 8 is a perspective view of the first mount bracket as viewed from the internal combustion engine side. FIG. 9 is a perspective view of the first mount bracket viewed from the vehicle body member side. FIG. 10 is a plan view of the first mount bracket. FIG. 11 is a side view of the first mount bracket as viewed from the internal combustion engine side. FIG. 12 is a sectional view taken along the section 12A-12A shown in FIG. FIG. 13 is a sectional view taken along the section 13A-13A shown in FIG. FIG. 14 is a sectional view taken along the section 14A-14A shown in FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. In addition, parts having different dimensional relationships and ratios between drawings may be included. In the specification and the drawings, elements having substantially the same function and configuration will be denoted by the same reference numerals, and redundant description will be omitted. Elements not directly related to the present invention will be omitted.

(1) Overall Schematic Configuration of Support Structure for Internal Combustion Engine FIG. 1 is a plan view of a support structure for an internal combustion engine according to the present embodiment. FIG. 2 is a rear view of the cover member and the mount bracket as viewed in the direction of arrow A shown in FIG. Arrow X shown in the drawing indicates the vehicle front-rear direction, arrow Y indicates the vehicle width direction, and Z indicates the vehicle vertical direction. The vehicle longitudinal direction X, the vehicle width direction Y, and the vehicle vertical direction Z are orthogonal to each other.

  In FIG. 1, the vehicle includes an engine 2 as an internal combustion engine, a body frame 8 as a body member, a mount bracket 5 for supporting the engine 2 on the body frame 8, and a vibration isolator 9. . The mount bracket 5 includes a first mount bracket 20 fastened to the engine 2 and a second mount bracket 30 fastened to the first mount bracket 20 and the vibration isolator 9. The vibration isolator 9 is fastened to the vehicle body frame 8 and suppresses transmission of vibration transmitted from the engine 2 via the mount bracket 5 to the vehicle body frame 8.

  The engine 2 has an engine body 3 having a plurality of cylinders 4 (see FIG. 7), and a cover member 10. The engine main body 3 of the present embodiment constitutes the internal combustion engine main body of the present invention. The cylinders 4 of the engine body 3 are arranged in series. The arrangement direction of the cylinders 4 is referred to as a cylinder row direction. The cylinder row direction in the present embodiment is along the vehicle width direction Y. The vehicle body frame 8 (body member) side is the outside in the vehicle width direction with respect to the components of the present invention, and the engine 2 (internal combustion engine) side is the vehicle width direction inside with respect to the components of the present invention. Hereinafter, the outer side in the vehicle width direction will be described as Y1, and the inner side in the vehicle width direction will be described as Y2. The vertical direction of the vehicle in the present embodiment is Z, and the longitudinal direction of the vehicle in the present embodiment is X.

(2) Detailed Configuration of Cover Member Next, the cover member 10 will be described in detail. FIG. 3 is an outer side view of the cover member 10 and the first mount bracket 20 according to the embodiment. 3 to 5, the second mount bracket 30 is not shown. FIG. 4 is an inner side view of the cover member 10. FIG. 5 is a side view of the cover member 10 viewed from the outside Y1 in the vehicle width direction. FIG. 6 is a cross-sectional view along the 6A-6A cross section shown in FIG. FIG. 7 is a cross-sectional view along the 7A-7A cross section shown in FIG. 7, the upper part of the cylinder head is partially omitted.

  The cover member 10 is arranged on the outer side Y1 of the engine main body 3 in the vehicle width direction Y, and is bonded to the bonding surface 3A of the outer side Y1 of the engine main body 3 in the vehicle width direction (see FIG. 2). The cover member 10 covers a timing chain (not shown) of the engine body 3. As shown in FIGS. 2 and 3, the cover member 10 has a main body 11 and a bulging portion 12. FIG. 2 shows the positional relationship between the main body 11 and the bulging portion 12 in the vehicle vertical direction Z.

  The main body 11 of the cover member 10 is arranged at a position corresponding to the cylinder block of the engine main body 3, and the amount of extension from the joint surface 3 </ b> A to the outside Y <b> 1 in the vehicle width direction Y is smaller than the bulging part 12 described later.

  The bulging part 12 is arranged at a position corresponding to the cylinder head on the upper part of the engine body 3, and is located above the main body part 11. The bulging portion 12 bulges outwardly in the vehicle width direction Y1 from the main body portion 11. The bulging portion 12 is provided from the upper end of the cover member 10 to the vicinity of the center of the cover member 10 in the vehicle vertical direction Z. The bulging portion 12 has a horizontal wall portion 12A extending outward from the main body portion 11 in the vehicle width direction Y1 and a vertical wall portion 12B extending in the vehicle vertical direction Z and connected to an end of the horizontal wall portion 12A on the vehicle body frame 8 side. And

  As shown in FIG. 5, the horizontal wall portion 12A is located on a first upper surface 121A extending from the upper end edge of the cover member 10 to the outside Y1 in the vehicle width direction, and on the lower side than the first upper surface 121A and on the outside Y1 in the vehicle width direction. A second upper surface 122A, a lower surface 12C extending from the lower edge of the vertical wall portion 12B toward the main body portion 11, a first side surface 12D arranged on one side of the vertical wall portion 12B in the vehicle front-rear direction X, A second side surface 12E disposed on the other side of the wall portion 12B in the vehicle front-rear direction X. In addition, the upper surface in the present embodiment is a surface arranged upward, and does not necessarily need to be located at the upper end. The upper surface of the bulging portion 12 has two upper surfaces having different positions in the vehicle vertical direction Z, and has a first upper surface 121A and a second upper surface 122A.

  The bulging part 12 is provided with a first cover fastening part 18 and a second cover fastening part 16. The first cover fastening portion 18 is fastened to the first bracket fastening portion 21 of the first mount bracket 20, and the second cover fastening portion 16 is fastened to the second bracket fastening portion 22. The first cover fastening portion 18 of the present embodiment constitutes a first fastening portion of the present invention, and the second cover fastening portion 16 of the present embodiment constitutes a second fastening portion of the present invention.

  As shown in FIG. 7, the first cover fastening portion 18 is provided on the second upper surface 122A. The first cover fastening portion 18 has a first screw hole 18A extending downward from the second upper surface 122A, and a first boss (not shown) surrounding the first screw hole. The upper portion of the first mount bracket 20 is fastened to the second upper surface 122A. The first mount bracket 20 is attached to the cover member 10 by fastening the bolt 18D to the first screw hole 18A of the first cover fastening part 18 through the first hole 21A of the first bracket fastening part 21 shown in FIG. Will be concluded.

  The vertical wall portion 12B of the bulging portion 12 is a surface extending in the vehicle vertical direction Z between the upper surface and the lower surface 12C of the bulging portion 12. The vertical wall portion 12B constitutes a surface of the outer side Y1 of the cover member 10 in the vehicle width direction. As shown in FIG. 5, a second cover fastening portion 16 is provided on the vertical wall portion 12B of the bulging portion 12. The second cover fastening portion 16 has a second screw hole 16A extending from the vertical wall portion 12B to the inside Y2 in the vehicle width direction, and a second boss 16B surrounding the second screw hole 16A. The lower portion of the first mount bracket 20 is fastened to the vertical wall portion 12B. The first mount bracket 20 is fastened to the cover member 10 by fastening the bolt 16D (see FIG. 3) to the second screw hole 16A through the second hole 22A of the second bracket fastening portion 22 shown in FIG. You.

  The cover member 10 has a main body 11 and a bulging portion 12, and the bulging portion 12 is provided with a first cover fastening portion 18 and a second cover fastening portion 16. By providing the bulging portion 12, the length of the mount bracket 5 in the vehicle width direction Y can be shortened, and the rigidity of the mount bracket 5 can be improved. Also, by making the bulging portion 12 larger than the conventional bulging portion and improving the coupling rigidity with the main body portion 11, the cover member 10 and the mount bracket 5 can be firmly connected, and the vibration of the mount bracket 5 can be improved. Can be suppressed. For example, the bulging portion 12 of the present invention is larger than the conventional bulging portion in all of the vehicle front-rear direction X, the vehicle width direction Y, and the vehicle vertical direction Z, and the outer edge portion of the And the vertical wall portion 12B is connected to the end of the second boss 16B constituting the second cover fastening portion 16, so that the vibration of the second boss 16B in the vehicle vertical direction Z can be suppressed. . Therefore, vibration of the mount bracket 5 in the vehicle vertical direction can be suppressed, and transmission of vibration from the engine 2 to the vehicle body frame 8 can be suppressed.

  The first side surface 12D and the second side surface 12E that constitute the horizontal wall portion 12A are arranged so as to sandwich the vertical wall portion 12B in the vehicle front-rear direction X. The first side surface 12D of the present embodiment constitutes a wall portion located on the side of the second fastening portion of the present invention, and the lower surface 12C of the present embodiment constitutes a wall portion located below the second fastening portion. , And the second side surface 12E of the present embodiment forms an inclined portion of the present invention. As shown in FIG. 6, the first side surface 12D and the lower surface 12C extend substantially in the vehicle width direction Y and extend in a direction orthogonal to the joint surface 3A. The second side surface 12E is inclined with respect to the vehicle width direction Y and the vehicle front-rear direction X. The second side surface 12E extends linearly from the edge of the vertical wall portion 12B to reach the outer edge 10E of the cover member 10. The outer edge in the embodiment is a portion occupying a certain range including the outer edge. According to this configuration, the vertical wall portion 12B and the outer edge portion 10E of the cover member 10 can be connected by the second side surface 12E extending in a direction crossing the first side surface 12D. Therefore, the force in the vehicle front-rear direction X applied from the mount bracket 5 to the bulging portion 12 of the cover member 10 is transmitted to the outer edge portion 10E of the cover member 10 by the second side surface 12E, and the bending of the bulging portion 12 can be suppressed. Therefore, the vibration of the bulging portion 12 in the vehicle front-rear direction X can be further suppressed.

  As shown in FIGS. 3 and 5, the horizontal wall portion 12A includes a lower surface 12C located below the second cover fastening portion 16 and first side surfaces 12D located on both sides of the second cover fastening portion 16 in the vehicle front-rear direction. And a second side surface 12E. According to this configuration, the force applied to the bulging portion 12 of the cover member 10 from the mount bracket 5 is transmitted to the front and rear outer edges of the cover member 10 and the portion where the distance between the front and rear outer edges is reduced, and 12 can be suppressed, and the vibration of the bulging portion 12 in the vehicle vertical direction Z can be further suppressed.

  The lower surface 12C of the bulging portion 12 is inclined downward from the lower end of the vertical wall portion 12B toward the inside Y2 in the vehicle width direction Y, as shown in FIG. An inner edge of the lower surface 12 </ b> C in the vehicle width direction Y is continuous with the main body 11.

  As shown in FIGS. 4 and 5, the cover member 10 is formed with a plurality of third cover fastening portions 15 that are fastened to the engine body 3 at the outer edge 10 </ b> E of the cover member 10. As shown in FIG. 6, the third cover fastening portion 15 has a third hole 15A into which a bolt 15D as a fastening member is inserted, and a third boss 15B surrounding the third hole 15A. The cover member 10 is fastened to the engine body 3 by fastening a bolt 15D to a screw hole (not shown) formed in the engine body 3 through the third hole 15A. Third cover fastening portion 15 of the present embodiment constitutes a third fastening portion of the present invention.

  The bulging portion 12 is provided between a pair of third cover fastening portions 15 extending in the vehicle vertical direction Z. At least one third cover fastening portion 15 of the plurality of third cover fastening portions 15 extends outward Y1 in the vehicle width direction more than the other third cover fastening portions 15 and is connected to the lateral wall portion 12A. . More specifically, as shown in FIG. 6, the third boss 15B and the third hole 15A extend outward from the joint surface 3A in the vehicle width direction Y1. Further, the third boss 15B is connected to the first side surface 12D constituting the horizontal wall portion 12A. According to this configuration, since the horizontal wall portion 12A and the third cover fastening portion 15 are connected, and the third cover fastening portion 15 extends toward the vertical wall portion 12B, the vertical wall portion 12A and the vertical wall portion connected to the horizontal wall portion 12A are connected. The rigidity of the wall portion 12B is increased, the rigidity of the entire bulging portion 12 is increased, and the vibration of the bulging portion 12 and the mount bracket 5 can be suppressed. Therefore, transmission of vibration from engine 2 to body frame 8 can be further suppressed.

  As shown in FIG. 6, the outer end 15E in the vehicle width direction Y of the third cover fastening portion 15 connected to the horizontal wall portion 12A is arranged near the vertical wall portion 12B. In other words, the height 15Y of the third cover fastening portion 15 in the vehicle width direction Y is 50% or more, more preferably 60% or more, of the height 12AY of the lateral wall portion 12A in the vehicle width direction Y. The height 15Y of the third cover fastening portion 15 in the vehicle width direction is a height between the outer end 15E of the third cover fastening portion 15 in the vehicle width direction and the joining surface 3A in the vehicle width direction Y. The height 12AY of the lateral wall portion 12A in the vehicle width direction is a distance in the vehicle width direction Y between the outer end 12AE of the lateral wall portion 12A in the vehicle width direction and the joint surface 3A. Since the outer end 15E of the third cover fastening portion 15 in the vehicle width direction is arranged near the vertical wall portion 12B, the effect of increasing the rigidity of the entire bulging portion can be more easily obtained, and the bulging portion can be obtained. 12 and the vibration of the mount bracket 5 can be suppressed. Therefore, transmission of vibration from engine 2 to body frame 8 can be further suppressed.

  As shown in FIG. 7, the cover member 10 has a fourth cover fastening portion 19 that extends from the vertical wall portion 12B to the inside in the vehicle width direction Y and is fastened to the engine body 3. The fourth cover fastening portion 19 has a fourth hole 19A into which a bolt 19D as a fastening member is inserted, and a fourth boss 19B surrounding the fourth hole 19A. The fourth cover fastening portion 19 extends in the vehicle width direction Y. The cover member 10 is fastened to the engine body 3 by fastening a bolt 19D to a screw hole 3B formed in the engine body 3 through the fourth hole 19A. The fourth cover fastening portion 19 is disposed at the center of the bulging portion 12 in the vehicle vertical direction Z. Therefore, the rigidity of the bulging portion 12 in the vertical direction Z of the vehicle can be increased by the fourth cover fastening portion 19, and the deformation of the bulging portion 12 can be suppressed, and the vibration suppressing effect can be further obtained. The fourth cover fastening portion 19 of the present embodiment forms a fourth fastening portion of the present invention.

  The fourth boss 19B of the fourth cover fastening portion and the lateral wall portion 12A of the bulging portion 12 are connected by a rib 17 extending in the vehicle vertical direction Z. In FIG. 7, the ribs 17 are shown with diagonal lines, and the ribs 17 are shown in FIG. The rib 17 is arranged in the bulging portion 12. A plurality of ribs 17 extend from the inner surface of the cover member 10 in the vehicle width direction Y toward the engine body 3 side. Some ribs 17 are arranged so as to extend radially around the fourth cover fastening portion 19 and extend inward in the vehicle width direction Y from the inner surface of the vertical wall portion 12B. By connecting the vertical wall portion 12B to both the fourth cover fastening portion 19 and the horizontal wall portion 12A by the rib 17 extending in the vehicle vertical direction Z, the deformation of the bulging portion 12 can be further suppressed. Vibration of the bulging portion 12 and the mount bracket 5 can be suppressed, and transmission of vibration from the engine 2 to the vehicle body frame 8 can be further suppressed.

  As shown in FIG. 4, the rib 17 connects the second cover fastening portion 16 and the fourth cover fastening portion 19. Specifically, the second boss 16B of the second cover fastening portion 16 swells inward in the vehicle width direction Y on the inner surface of the cover member 10 in the vehicle width direction Y. The second boss 16B and the fourth boss 19B are connected by a rib 17. The ribs 17 can further suppress the vibration of the second cover fastening portion 16 in the vehicle vertical direction Z. Therefore, transmission of vibration from engine 2 to body frame 8 can be further suppressed.

  As shown in FIG. 7, the distance L2 in the vehicle width direction Y between the center axis 18CL of the first screw hole 18A of the first cover fastening portion 18 and the joint surface 3A is equal to the arrangement pitch L1 of the cylinders 4 in the vehicle width direction Y. Longer than. When the distance L2 is increased, the mount bracket 5 can be shortened and the rigidity can be increased, but the first cover fastening portion 18 tends to vibrate in the vehicle vertical direction Z. However, in the present embodiment, since the rigidity of the bulging portion is increased by the above structure, the vibration of the first cover fastening portion 18 can be suppressed, and the transmission of the vibration from the engine 2 to the body frame 8 is further suppressed. it can.

(3) Detailed Configuration of Mount Bracket Next, the mount bracket 5 will be described in detail. The mount bracket 5 has a first mount bracket 20 and a second mount bracket 30. FIG. 8 is a perspective view of the first mount bracket 20 viewed from the internal combustion engine side, and FIG. 9 is a perspective view of the first mount bracket 20 viewed from the vehicle body member side. FIG. 10 is a plan view of the first mount bracket 20. FIG. 11 is a side view of the first mount bracket viewed from the internal combustion engine side. FIG. 12 is a sectional view taken along the section 12A-12A shown in FIG. FIG. 13 is a sectional view taken along the section 13A-13A shown in FIG. FIG. 14 is a sectional view taken along the section 14A-14A shown in FIG.

  The first mount bracket 20 is fastened to the cover member 10 and the second mount bracket 30. As shown in FIGS. 9 and 12 and the like, the center of the first mount bracket 20 in the vehicle vertical direction Z is swelled outward Y1 in the vehicle width direction from the upper end and lower end of the first mount bracket 20. The upper end in the present embodiment is a portion occupying a certain range including the upper edge, and the lower end is a portion occupying a certain range including the lower edge. As shown in FIG. 9, the upper surface 24 arranged upward in the first mount bracket 20 has two upper surfaces having different positions in the vehicle vertical direction Z, and is provided at the upper end of the first mount bracket 20. It has a first upper surface 24A and a second upper surface 24B located below the first upper surface 24A and outside Y1 in the vehicle width direction. The second upper surface 24B is provided in the middle of a curved portion 29 described later.

  The first mount bracket 20 has a first side surface 26, which is a surface on the outside Y1 in the vehicle width direction, and a second side surface 27, which is a surface on the inside Y2 in the vehicle width direction. The first side surface 26 is a surface disposed on the first mount bracket 20 toward the side opposite to the engine 2, and the second side surface 27 is a surface disposed on the first mount bracket 20 toward the engine 2 side. is there. The first side surface 26 and the second side surface 27 extend in the vehicle vertical direction Z between the upper surface 24 and the lower surface 25, respectively.

  The first mount bracket 20 includes a first bracket fastening portion 21 fastened to the first cover fastening portion 18 of the cover member 10, and a second bracket fastening portion 22 fastened to the second cover fastening portion 16 of the cover member 10. And a third bracket fastening portion 23 to which the second mount bracket 30 is fastened. The first bracket fastening portion 21 is provided at an upper end of the first mount bracket 20, and the second bracket fastening portion 22 is provided at a lower end of the first mount bracket 20. The first bracket fastening portion 21 and the second bracket fastening portion are arranged at an interval in the vehicle vertical direction Z.

  The first bracket fastening portion 21 includes a first hole 21A extending downward from the first upper surface 24A of the first mount bracket 20, and a first boss 21B surrounding the first hole 21A. . The upper surface of the first bracket fastening portion 21 is disposed on the first upper surface 24 </ b> A of the first mount bracket 20. The lower surface of the first bracket fastening portion 21 contacts the second upper surface (upper surface) 122 </ b> A of the bulging portion 12 of the cover member 10. A plurality of first bracket fastening portions 21 are provided at intervals in the vehicle front-rear direction X. The positions of the plurality of first bracket fastening portions 21 in the vehicle vertical direction Z match.

  The second bracket fastening portion 22 includes a second hole 22A extending in the vehicle width direction Y, and a second boss 22B surrounding the second hole 22A. The second bracket fastening portion 22 reaches from the first side surface 26 to the second side surface 27. The surface of the outer side Y1 in the vehicle width direction of the second bracket fastening portion 22 is disposed on the first side surface 26. The surface of the inside Y2 in the vehicle width direction of the second bracket fastening portion 22 is arranged on the second side surface 27 and abuts on the vertical wall portion 12B of the bulging portion 12. A plurality of second bracket fastening portions 22 are provided at intervals in the vehicle front-rear direction X. The positions of the plurality of second bracket fastening portions 22 in the vehicle vertical direction Z are shifted.

  The second fastening portion is disposed below the first fastening portion, and at least a portion of the first bracket fastening portion 21 overlaps the second bracket fastening portion 22 in the vehicle vertical direction Z. It is sufficient that at least a part of the first bracket fastening part 21 and at least a part of the second bracket fastening part 22 overlap in the vehicle vertical direction Z, and the first bracket fastening part 21 and the second bracket fastening part 22 are located in the whole area. They do not have to overlap. In the present embodiment, as shown in FIG. 12, the diameter of the first bracket fastening portion 21 in the vehicle width direction Y is longer than the length of the second bracket fastening portion 22 in the vehicle width direction Y, and the first bracket fastening portion Reference numeral 21 entirely overlaps the second bracket fastening portion 22.

  Since the first bracket fastening portion 21 and the second bracket fastening portion 22 have a portion that overlaps in the vehicle vertical direction Z, the position of the first bracket fastening portion 21 and the second bracket fastening portion 22 in the vehicle width direction Y is shifted. Can be reduced. If the positional deviation between the first bracket fastening portion 21 and the second bracket fastening portion 22 in the vehicle width direction Y is large, the first bracket fastening portion 21 is moved to the second position when external force in the vehicle vertical direction acts on the first mount bracket 20. There is a possibility that the moment to rotate around the two bracket fastening portion 22 increases, and the vibration of the first mount bracket 20 in the vehicle vertical direction Z increases. However, since the second fastening portion is disposed below the first fastening portion, no moment for rotating the first bracket fastening portion 21 around the second bracket fastening portion 22 is generated, and the second bracket fastening portion is not generated. The vibration in the vehicle vertical direction Z of the first mount bracket 20 and the first mount bracket 20 can be reduced. In addition, since the first bracket fastening portion 21 and the second bracket fastening portion 22 have a portion overlapping in the vehicle vertical direction Z, the load is substantially evenly distributed to the first bracket fastening portion 21 and the second bracket fastening portion 22. The mounting bracket can be supported stably. As a result, it is difficult to transmit the vibration transmitted from the engine to the vehicle body frame 8.

  The third bracket fastening portion 23 is provided on a curved portion 29 described later. As shown in FIG. 9, the third bracket fastening portion 23 includes a third screw hole 23A extending downward from the second upper surface 24B, and a third boss 23B surrounding the third screw hole 23A. Have been. The upper surface of the third bracket fastening portion 23 is disposed on the second upper surface 24B of the first mount bracket 20. A plurality of third bracket fastening portions 23 are provided at intervals in the vehicle front-rear direction X. The positions of the plurality of third bracket fastening portions 23 in the vehicle vertical direction Z match. The second mount bracket 30 is fastened to the first mount bracket 20 in a state in which the second mount bracket 30 is in contact with the second upper surface 24 </ b> B constituting the upper surface of the third bracket fastening portion 23. As shown in FIG. 1, one end of the second mount bracket 30 in the axial direction is fastened to the third screw hole 23 </ b> A of the first mount bracket 20, and the other end of the second axial direction of the second mount bracket 30 is a hole ( A stud bolt 23 </ b> D extending outward through a not-shown) and a nut 23 </ b> E mounted on the outside are fastened to the first mount bracket 20.

  The first mount bracket 20 has a curved portion 29 whose central portion in the vehicle vertical direction extends outward Y1 in the vehicle width direction from the first bracket fastening portion 21 and the second bracket fastening portion 22. The bending portion 29 of the present embodiment is bent at the outer portion of the first bracket fastening portion 21 in the vehicle width direction Y and extends downward, and then bent toward the inside Y2 of the vehicle width direction Y to be bent at the second bracket fastening portion. 22. The lower edge of the curved portion 29 substantially coincides with the upper edge of the second bracket fastening portion 22. The upper edge of the curved portion 29 substantially coincides with the first upper surface 24A of the first mount bracket 20. The outer edge Y1 of the curved portion 29 in the vehicle width direction is defined by a first side surface 26, and the inner edge of the curved portion 29 in the vehicle width direction Y2 is defined by a second side surface 27.

  As shown in FIG. 12, the length 29Y of the bending portion 29 in the vehicle width direction Y is less than 50% of the length 29Z of the bending portion 29 in the vehicle vertical direction Z. As a result, the third bracket fastening portion 23, which is disposed in the vehicle vertical direction Z intermediate portion of the bending portion 29 and to which the second mount bracket 30 is fastened, is connected to the first bracket fastening portion 21 to be fastened to the cover member 10. It can be arranged at a position close to the two-bracket fastening portion 22 in the vehicle width direction Y. Since the length of the curved portion 29 swelling is shorter than the length of the curved portion 29 in the vehicle vertical direction Z, the vibration of the curved portion 29 in the vehicle vertical direction Z is easily suppressed. Therefore, vibration of the first mount bracket 20 in the vehicle vertical direction Z can be suppressed, and transmission of vibration from the engine 2 to the vehicle body frame 8 can be suppressed. More preferably, the length 29Y of the curved portion 29 in the vehicle width direction Y may be equal to or less than 30% of the length of the curved portion in the vertical direction, and the effect of suppressing vibration is further obtained.

  In particular, in the case of the engine 2 which is installed horizontally so that the cylinders are arranged in the vehicle width direction Y, downsizing may be achieved by reducing the number of cylinders from the viewpoint of improving the fuel efficiency of the engine 2. If the engine is downsized without changing the mounting position of the engine 2 with respect to the vehicle body (the size of the engine in the vehicle width direction decreases), the gap between the vehicle body and the engine increases, and the length of the mount bracket 5 increases. At this time, in the support structure of the internal combustion engine according to the present embodiment, since the cover member 10 has the bulging portion 12 larger than the conventional one and the vibration of the mount bracket 5 and the cover member 10 can be reduced, Is transmitted to the vehicle body frame 8 effectively.

  The curved portion 29 is provided with a second upper surface 24B of the first mount bracket 20, and a vertical wall 24C connecting the second upper surface 24B and the first upper surface 24A and extending in the vehicle vertical direction Z. A third bracket fastening portion 23 to which the second mount bracket 30 is fastened is provided on the second upper surface 24B. Since the third bracket fastening portion 23 is located near the first bracket fastening portion 21 and the second bracket fastening portion 22 in the vehicle width direction Y of the curved portion 29, the third bracket fastening portion 23 is provided for the fastening portion for the second mount bracket 30 and the cover member. It is possible to shorten the interval between the connecting portion and the vehicle in the vehicle width direction Y. Therefore, the vibration of the mount bracket 5 in the vehicle vertical direction Z can be suppressed, and the transmission of the vibration from the engine 2 to the vehicle body frame 8 can be suppressed.

  The curved portion 29 bends to the inside Y2 in the vehicle width direction Y below the third bracket fastening portion 23, and then curves downward to be connected to the upper portion of the second bracket fastening portion 22. For this reason, the cross-sectional area of the portion (the portion below the second upper surface and above the second fastening portion in the curved portion) connecting the second upper surface 24B and the second bracket fastening portion 22 can be secured. Then, the vibration of the first mount bracket 20 in the vehicle vertical direction Z can be suppressed, and the transmission of the vibration from the engine 2 to the vehicle body member can be suppressed.

  As shown in FIG. 14, the first side surface 26 and the second side surface 27 of the curved portion 29 are both bulging outward in the vehicle width direction Y. The intersection CP between the second side surface 27 and the virtual surface FL passing through the edge of the outer side Y1 of the second bracket fastening portion 22 in the vehicle width direction and extending in the vehicle vertical direction Z is the second bracket in the vehicle vertical direction Z. The third bracket fastening portion 23 is arranged more than the fastening portion 22. In other words, the distance G23 from the intersection CP to the third bracket fastening portion 23 is shorter than the distance G22 from the intersection CP to the second bracket fastening portion 22. Since the intersection point CP is closer to the third bracket fastening part 23 side than the second bracket fastening part 22, the length of the curved part 29 from the upper end of the second bracket fastening part 22 to the intersection point CP can be secured. The cross-sectional area along the virtual plane FL of the section connecting the second bracket fastening portion 22 and the third bracket fastening portion 23 in the curved portion 29 can be further increased. For this reason, the rigidity of the portion connecting the second bracket fastening portion 22 and the third bracket fastening portion 23 in the curved portion 29 is increased, the vibration of the first mount bracket 20 is further suppressed, and the vibration from the engine is reduced. Can be effectively suppressed.

  The intersection CP of the first mount bracket 20 of the present embodiment is arranged between the upper surface of the second bracket fastening portion 22 and the upper surface of the third bracket fastening portion 23 in the vehicle vertical direction Z. In addition, an intersection CP is arranged on the inside Y2 of the third bracket fastening portion 23 in the vehicle width direction. Therefore, the cross-sectional area along the virtual plane FL of the portion connecting the upper surface of the second bracket fastening portion 22 and the upper surface of the third bracket fastening portion 23 in the curved portion 29 is increased, and the first mount bracket 20 Vibration can be further suppressed.

  As shown in FIG. 8, a concave portion 29 </ b> A that is concave in the vehicle width direction Y is formed in the curved portion 29 of the first mount bracket 20. More specifically, a concave portion 29 </ b> A that is recessed from the second side surface 27 toward the first side surface 26 is formed in the curved portion 29. The plurality of concave portions 29A are formed at intervals in the vehicle front-rear direction X. Since the concave portion 29A is formed in the curved portion 29, the weight of the first mount bracket 20 can be reduced.

  As shown in FIG. 14, the concave portion 29A is arranged on the inner side Y2 in the vehicle width direction from the third boss 23B of the third bracket fastening portion 23. The first side surface 26 is curved to the inside Y2 in the vehicle width direction, and an upper wall thereof is connected to a lower end of the third boss 23B. Therefore, the support rigidity of the third boss 23B can be increased, and the vibration of the first mount bracket 20 in the vehicle vertical direction Z can be suppressed. Since the concave portion 29A and the third bracket fastening portion 23 are adjacent to each other, the vibration of the first mount bracket 20 can be suppressed while the weight of the first mount bracket 20 is reduced.

  The recess 29A of the present embodiment is recessed from the second side surface 27 toward the first side surface 26. Further, the third bracket fastening portion 23 is provided on the outer side Y1 in the vehicle width direction than the concave portion 29A. However, the recess 29A may have a shape that is recessed from the first side surface 26 toward the second side surface 27. In addition, at least one recess 29A may be provided, and a plurality of recesses may not be provided.

  The second bracket fastening portion 22 has a plurality of second bracket fastening portions 22 having different positions in the vehicle vertical direction Z. Specifically, the second bracket fastening portion 22 has an upper fastening portion 222 arranged near the lower side of the third boss 23B and a lower fastening portion 221 arranged at the lowermost portion of the first mount bracket 20. . The lower edge of the curved portion 29 is formed in a shape surrounding the outer periphery of the lower portion of the upper fastening portion 222 and the lower portion of the lower fastening portion 221. The upper fastening portion 222 is connected to a wall 222A that connects the first side surface 26 and the second side surface 27. Since the upper fastening portion 222 and the wall 222A are provided between the third boss 23B and the lower fastening portion 221 in the vehicle vertical direction Z of the curved portion 29, the third boss 23B in the vehicle vertical direction Z of the curved portion 29 is provided. The rigidity of the lower region is increased. Therefore, the vibration of the bending portion 29 in the vehicle vertical direction Z can be suppressed, and the vibration of the first mount bracket 20 can be further suppressed.

  Although the present invention has been described in detail with reference to the above embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be embodied as modified and changed embodiments without departing from the spirit and scope of the present invention defined by the description of the claims. Therefore, the description in this specification is for the purpose of illustration and description, and has no restrictive meaning to the present invention.

2: Engine (internal combustion engine)
3: Engine body (internal combustion engine body)
4: Cylinder 8: Body frame (body member)
10: cover member 11: body portion 12: bulging portion 15: third cover fastening portion (third fastening portion)
16: second cover fastening portion (second fastening portion)
17: rib 18: first cover fastening part (first fastening part)
19: Fourth cover fastening part (fourth fastening part)
Reference numeral 20: first mount bracket 21: first bracket fastening portion 22: second bracket fastening portion 221: lower fastening portion 222: upper fastening portion 23: third bracket fastening portion 23A: third screw hole portion 23B: third boss 23D: stud bolt 26: first side surface 27: second side surface 29: curved portion 30: second mount bracket X: vehicle longitudinal direction Y: vehicle width direction Z: vehicle vertical direction

Claims (7)

An internal combustion engine, a vehicle body member, and a support structure of the internal combustion engine having a mount bracket that supports the internal combustion engine on the vehicle body member,
The internal combustion engine has an internal combustion engine body, and a cover member joined to a joining surface of the internal combustion engine body facing the vehicle body member side,
The cover member has a main body, and a bulging portion that bulges toward the vehicle body member side with respect to the main body,
The bulging portion has a horizontal wall portion extending from the main body portion to the vehicle body member side, and a vertical wall portion extending in a vehicle vertical direction and connected to an end of the horizontal wall portion on the vehicle body member side,
A first fastening portion to which an upper portion of the mount bracket is fastened is provided at an upper portion of the lateral wall portion,
The support structure for an internal combustion engine, wherein a second fastening portion to which a lower portion of the mount bracket is fastened is provided on the vertical wall portion. The lateral wall has a wall extending in a direction perpendicular to the joining surface,
The support structure for an internal combustion engine according to claim 1, wherein the wall portion is provided below the second fastening portion and on a side of the second fastening portion. The cover member has a plurality of third fastening portions arranged on an outer edge of the cover member and fastened to the internal combustion engine body,
The at least one third fastening portion of the plurality of third fastening portions extends from the joining surface to the vicinity of the vertical wall portion and is connected to the horizontal wall portion. Support structure for internal combustion engines.   The said horizontal wall part has the inclined part which inclines with respect to the said joining surface, and has an inclined part which extends toward the said vertical wall part from the outer edge part of the said cover member. A support structure for an internal combustion engine as described in the above. The cover member extends from the vertical wall portion to the inside of the bulging portion, and is provided with a fourth fastening portion fastened to the internal combustion engine body.
The fourth fastening portion has a fourth hole into which a fastening member is inserted, and a fourth boss surrounding the fourth hole,
The support structure for an internal combustion engine according to any one of claims 1 to 4, wherein the fourth boss and the lateral wall portion are connected by a rib disposed inside the bulging portion. The second fastening portion has a second screw hole to which a fastening member is fastened, and a second boss surrounding the second screw hole,
The support structure for an internal combustion engine according to claim 5, wherein the second boss is connected to the rib. The internal combustion engine has a plurality of cylinders arranged in series,
The first fastening portion has a first screw hole having a central axis extending in a vehicle vertical direction,
7. The support structure for an internal combustion engine according to claim 1, wherein a distance between a central axis of the first screw hole and the joint surface is longer than an arrangement pitch of the cylinders. 8.

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