JP2018122704A - Temporary structure for engine mount - Google Patents

Abstract

The present invention provides a temporary fixing structure of an engine mount that can temporarily temporarily fix an engine unit to a vehicle body with high accuracy. A temporary fixing bolt (62) projecting downward from an engine mount bracket (16) during assembly of a vehicle is inserted into an insertion hole (78) of a pedestal (71) of a transmission (20) and fastened (temporarily fixed) with a nut (80). At this time, the axial length L2 of the insertion portion 66 of the temporary fixing bolt 62 is longer than the axial length L1 of the insertion hole 78, and the insertion portion 66 is adjacent to the screw portion 68 and is smaller than the screw portion 68. An enlarged tapered portion 70 is formed. Therefore, the nut 80 fastened to the screw portion 68 does not rise to the position of the insertion portion 66. As a result, the reaction force of the fastening torque acts between the engine mount bracket 16 and the transmission 20 to prevent the two from relatively displacing. Therefore, the engine unit can be temporarily fixed to the vehicle accurately. [Selection] Figure 3

Description

  The present invention relates to a temporary fixing structure for an engine mount.

  An engine unit of an automobile is supported by a front side member or the like that is a vehicle body skeleton member via an engine mount. On one side of the engine unit, the upper surface of the transmission and the front side member may be supported in an anti-vibration manner via an engine mount.

  By the way, in the engine mounting process of the assembly line of the vehicle body, the engine unit is lifted and lifted with respect to the vehicle body that is hung on the hanger, and the engine unit is attached to the vehicle body via the engine mount. It is attached.

  When vibration-proofing is supported as described above, the engine mount that is fastened to the upper part of the transmission at the time of assembly has a high height above the ground and cannot be reached by workers. Therefore, the engine mount sub-assembled to the front side member is temporarily fixed to a pedestal formed on the upper part of the transmission.

  At this time, a bolt erected downward from the engine mount side is inserted into an insertion hole formed in the pedestal that penetrates in the vertical direction, and an operator tightens a nut from below the pedestal to temporarily fix it. Done.

  As a prior art related to this, for example, a temporary fixing method as in Patent Document 1 has been proposed.

JP-A-9-309344

  As described above, when the bolt fixed to the engine mount side is inserted from the top into the insertion hole extending in the vertical direction on the pedestal and tightened with the nut from below, the nut is the bottom surface of the pedestal (transmission) The reaction force of the fastening torque acts around the axis of the bolt at the time of fastening. As a result, the transmission (engine unit) is relatively displaced with respect to the vehicle body (engine mount) side, and there is a problem in that the engine unit cannot be accurately positioned with respect to the vehicle body (engine mount) side during temporary fixing.

  In view of the above-described facts, an object of the present invention is to provide a temporary fixing structure of an engine mount capable of temporarily fixing an engine unit to a vehicle body with high accuracy.

  The temporary mounting structure of the engine mount according to the first aspect of the present invention is a front side member that is a vehicle skeleton member extending in the vehicle front-rear direction at a side portion on the front side of the vehicle, and is subassembled into the front side member. An engine mount, an engine mount bracket supported in an anti-vibration manner with respect to the engine mount, and a pedestal that forms part of the engine unit and is positioned below the engine mount bracket when the vehicle is assembled are formed on the pedestal. Has a transmission in which an insertion hole extending in the vertical direction is formed, an insertion portion that can be inserted into the insertion hole, and a screw portion that is formed on the lower end side of the insertion portion and into which a nut is screwed. The insertion portion has an axial length that is longer than the axial length of the insertion hole, and is wider than the screw portion in a portion adjacent to the screw portion. It provided with a fastening bolt enlarged diameter portion is formed with, a.

  In the temporary mounting structure of the engine mount according to the first aspect of the present invention, in the vehicle assembly process, when the engine unit is assembled to the vehicle, it is supported in an anti-vibration manner with respect to the engine mount sub-assembled to the front side member. The transmission (engine unit) is brought closer to the engine mount bracket while being aligned from below. As a result, the fastening bolt that protrudes downward and is fixed from the engine mount bracket is inserted into the insertion hole formed in the base of the transmission. Here, since the insertion part of the fastening bolt is longer than the axial length of the insertion hole, the lower end of the insertion part protrudes from the insertion hole, and the screw part formed at the lower end of the insertion part protrudes downward from the insertion hole. Yes. The transmission is temporarily fixed to the engine mount bracket by fastening the nut to the threaded portion from which the worker protrudes.

  Here, the insertion part of the fastening bolt is formed longer than the axial length of the insertion hole formed in the base of the transmission, and the lower end protrudes downward from the insertion hole. Moreover, since the part adjacent to the screw part is an enlarged diameter part whose diameter is larger than that of the screw part, the nut fastened to the screw part does not rise to the position of the insertion part. Therefore, the nut does not contact the lower end of the pedestal of the transmission during fastening (temporary fastening), and the reaction force of the fastening torque does not act between the engine mount bracket and the transmission. Therefore, the engine mount bracket does not displace relative to the transmission (relatively rotates and displaces around the axis of the fastening bolt), and the engine unit can be temporarily fixed to the vehicle body with high accuracy.

  The temporary mounting structure of the engine mount according to the first aspect of the present invention can temporarily fix the engine unit to the vehicle body with high accuracy.

It is a perspective view showing the temporary fix structure of the engine mount before temporary fix concerning one embodiment of the present invention. It is a top view which shows the temporary fix structure of the engine mount after the temporary fix which concerns on one Embodiment of this invention. It is the sectional view on the AA line of FIG.

  A temporary fixing structure of an engine mount according to an embodiment of the present invention will be described with reference to FIGS. The upper side in the vehicle vertical direction is indicated by arrow UP, the front side in the vehicle front-rear direction is indicated by arrow FR, and the right side in the vehicle width direction is indicated by arrow RH. Note that the mounting (fastening) of the engine unit to the vehicle body is performed via the engine mount in at least two places other than the parts described in the present embodiment, but the description of the fastening is omitted.

(Constitution)
As shown in FIG. 1, the engine mount temporary fixing structure 10 includes a front side member 12 (only one is shown) extending in the vehicle front-rear direction on both sides in the vehicle width direction, and a sub-assembly that is fastened to the front side member 12. Engine mount 14, engine mount bracket 16 fastened to the engine mount 14 and supported by vibration isolation, and transmission 20 constituting a part of the engine unit 18 temporarily fixed to the engine mount bracket 16. And.

  The engine mount 14 includes a side member mounting portion 22 that is fastened to the side wall 12A of the front side member 12, and a rubber mounting portion 26 that protrudes inward in the vehicle width direction from the side member mounting portion 22 and is attached with a vibration isolating rubber 24. And a bracket support portion 28 provided through the anti-vibration rubber 24.

  The side member mounting portion 22 includes a rectangular mounting surface 30 as viewed from the vehicle width direction extending in the vehicle front-rear direction, and a vertical wall 32 formed to project inward in the vehicle width direction from the front and rear ends and the upper end of the mounting surface 30. 34 and a lateral wall 36. A pair of insertion holes (not shown) are provided on the front and rear end sides of the mounting surface 30. The side wall 12A of the front side member 12 is also provided with an insertion hole (not shown) at a position corresponding to the insertion hole. Therefore, the engine mount 14 is fixed to the front side member 12 by inserting the bolt 38 from the inner side in the vehicle width direction into the insertion hole of the mounting surface 30 and the insertion hole of the front side member 12 and fastening with the nut from the opposite side. (Sub-assembled).

  The rubber mounting portion 26 is formed so as to protrude from the center in the front-rear direction of the side member mounting portion 22 to the inner side (right side) in the vehicle width direction. The rubber mounting portion 26 includes a front wall 40 extending in the vehicle vertical direction as viewed from the vehicle width direction, an upper wall 42 extending from the upper end of the front wall 40 to the vehicle rear side, and a vehicle from the rear end of the upper wall 42. And a rear wall 44 extending downward. The rubber mounting portion 26 is formed in an inverted U shape when viewed from the vehicle width direction by the front wall 40, the upper wall 42, and the rear wall 44.

  Further, the rubber mounting portion 26 is formed with a cylindrical portion 46 extending in the vehicle front-rear direction from the front wall 40 toward the rear wall 44. A cylindrical anti-vibration rubber 24 is press-fitted into the cylindrical portion 46. A plate-shaped bracket support portion 28 that is insert-molded in the vibration-proof rubber 24 is fixed to the axial center portion of the columnar vibration-proof rubber 24.

  As shown in FIG. 2, the bracket support portion 28 has a front end portion 48 and a rear end portion 50 that protrude front and rear from the front and rear ends of the vibration isolating rubber 24. Insertion holes (not shown) are formed in the front end portion 48 and the rear end portion 50, respectively, and stud bolts 56A and 56B described later provided in the engine mount bracket 16 are inserted from below.

  As shown in FIGS. 1 and 2, the engine mount bracket 16 that is supported by the engine mount 14 in an anti-vibration manner has a rectangular mounting plate 52 extending in the vehicle front-rear direction and a central portion in the front-rear direction of the mounting plate 52. A pair of support portions 54A and 54B are erected. Stud bolts 56A and 56B are erected on the upper surfaces of the support portions 54A and 54B, and the stud bolts 56A and 56B are inserted into insertion holes (not shown) of the bracket support portion 28 of the engine mount 14 and are fitted with nuts 58A and 58B. By being fastened, the engine mount bracket 16 is supported by the engine mount 14 in a vibration-proof manner. That is, the engine mount bracket 16 is sub-assembled with respect to the engine mount 14.

  The distance in the front-rear direction (interval) between the pair of support portions 54A, 54B is set wider than the distance in the front-rear direction between the front wall 40 and the rear wall 44 of the engine mount 14. In other words, when the engine mount 14 and the engine mount bracket 16 are fastened, the rubber mounting portion 26 is disposed with a movable range between the pair of support portions 54A and 54B.

  In the mounting plate 52, a pair of insertion holes 60A and 60B are formed on the front side of the support portion 54A and the rear side of the support portion 54B, respectively.

  In addition, a temporary fixing bolt 62 is erected downward on the rear side of the lower surface 52A of the mounting plate 52. As shown in FIG. 3, the temporary fixing bolt 62 includes a head portion 64, an insertion portion 66 inserted into an insertion hole 78 described later of the transmission 20, and a screw portion 68 to which a nut 80 described later is fastened. .

  As shown in FIG. 3, the head 64 is press-fitted into the lower surface 52 </ b> A of the mounting plate 52, so that the temporary fixing bolt 62 is fixed to the mounting plate 52. The insertion portion 66 of the temporary fixing bolt 62 extends downward from the lower end of the head portion 64. The insertion portion 66 has an axial length L2 longer than an axial length (plate thickness of the attachment portion 74) L1 of the insertion hole 78 of the attachment portion 74. The screw portion 68 extends downward from the lower end of the insertion portion 66. A tapered portion 70 having a diameter larger than that of the screw portion 68 is formed in a portion adjacent to the screw portion 68 in the insertion portion 66. The tapered portion 70 corresponds to the enlarged diameter portion of the present invention.

  As shown in FIG. 1, a pedestal 71 is attached to the upper surface of the transmission 20 on the left side in the vehicle width direction. The pedestal 71 is formed with a flat base 72 and a flat mounting portion 74 that protrudes to the left from the upper left end of the base 72 in the vehicle width direction. The mounting portion 74 has substantially the same shape as the mounting plate 52 of the engine mount bracket 16, and a pair of screw holes 76A and 76B are formed at positions corresponding to the insertion holes 60A and 60B, respectively. Further, in the attachment portion 74, an insertion hole 78 penetrating the attachment portion 74 in the vertical direction is formed at a position corresponding to the temporary fixing bolt 62 of the attachment plate 52.

(Function)
Next, the operation at the time of temporary fixing of the temporary mounting structure 10 of the engine mount configured as described above will be described.

  First, before the assembly, the engine mount 14 is fastened (sub-assembled) to the front side member 12 by bolts 38 and nuts (not shown). Subsequently, the engine mount bracket 16 is fastened (sub-assembled) to the engine mount 14 by the stud bolts 56A and 56B of the engine mount bracket 16 and the nuts 58A and 58B. That is, the engine mount bracket 16 is supported by the engine mount 14 in a vibration-proof manner.

  When the engine unit is assembled to the vehicle body, the engine unit placed on the lifter is raised with respect to the suspended vehicle body and assembled to the vehicle body. At this time, the temporary fixing bolts 62 protruding downward and fixed from the mounting plate 52 of the engine mount bracket 16 integrated with the front side member 12 are inserted into the insertion holes 78 of the base 71 (mounting portion 74) of the transmission 20. Inserted. Here, as shown in FIG. 3, the axial length L2 of the insertion portion 66 of the temporary fixing bolt 62 is longer than the axial length (thickness of the attachment portion 74) L1 of the insertion hole 78 by a distance D. Therefore, the lower end of the insertion portion 66 protrudes downward from the lower surface 74 </ b> A of the attachment portion 74.

  Therefore, when the nut 80 is fastened to the screw portion 68 of the temporary fixing bolt 62 from below, the diameter of the insertion portion 66 of the temporary fixing bolt 62 adjacent to the screw portion 68 is larger than that of the screw portion 68. Since the tapered portion 70 is formed, the nut 80 does not reach above the screw portion 68. That is, a gap of a distance D is ensured between the upper surface 80A of the nut 80 and the lower surface 74A of the attachment portion 74. Therefore, when the nut 80 is fastened to the temporary fixing bolt 62 (screw portion 68), the engine mounting bracket 16 is temporarily attached to the base 71 (mounting portion 74) of the transmission 20 by the reaction force of the fastening torque. Is prevented from being relatively rotationally displaced around the axis (the anti-vibration rubber 24 is twisted). That is, the temporary fixing prevents the insertion holes 60A and 60B of the engine mount bracket 16 (mounting plate 52) and the screw holes 76A and 76B of the transmission 20 (mounting portion 74) from being displaced, and alignment accuracy at the time of temporary fixing Is secured.

  After the engine unit 18 is attached (temporarily fixed) to the vehicle body, the bolts 82A and 82B are inserted into the insertion holes 60A and 60B of the engine mount bracket 16 when the vehicle body is lowered, and the transmission 20 (the attachment portion 74). The engine unit 18 (transmission 20) is permanently fixed to the engine mount bracket 16 by screwing the bolts 82A and 82B into the screw holes 76A and 76B.

  Thus, in the engine mount temporary fixing structure 10, the axial length L2 of the insertion portion 66 of the temporary fixing bolt 62 is longer than the axial length L1 of the insertion hole 78 of the mounting portion 74 of the transmission 20. When the temporary fixing bolt 62 is inserted into the insertion hole 78, the end of the insertion portion 66 protrudes downward from the lower surface 74A of the attachment portion 74 by a distance D (L2-L1). In addition, since a tapered portion 70 having a diameter larger than that of the screw portion 68 is formed in a portion adjacent to the screw portion 68 in the insertion portion 66, the nut 80 screwed into the screw portion 68 is located above the screw portion 68. Never move on. Therefore, the upper surface 80A of the nut 80 does not contact the lower surface 74A of the mounting portion 74 when the nut 80 is fastened. Therefore, when the nut 80 is fastened, a reaction force of the fastening torque acts, and the mounting plate 52 of the engine mount bracket 16 is rotationally displaced relative to the mounting portion 74 of the transmission 20 around the axis of the temporary fixing bolt 62. It is prevented. That is, it is prevented or suppressed that the mounting plate 52 of the engine mount bracket 16 is relatively displaced with respect to the mounting portion 74 of the transmission 20 during temporary fixing and the positions of the insertion holes 60A and 60B and the screw holes 76A and 76B are shifted. Is done.

  Further, in order to prevent the mounting plate 52 of the engine mount bracket 16 from being displaced relative to the mounting portion 74 of the transmission 20 during temporary fixing, it is not necessary to separately provide a jig.

[Others]
In the present embodiment, the axial length L2 of the insertion portion 66 of the temporary fixing bolt 62 is set to be longer than the axial length L1 of the insertion hole 78, and the insertion portion 66 is adjacent to the screw portion 68. By forming the tapered portion 70 having a diameter larger than that of the screw portion 68 at the portion, the nut 80 is prevented from moving to the insertion portion 66 side at the time of fastening, but the diameter is larger than that of the screw portion 68 instead of the tapered portion 70. A stepped portion may be used. Alternatively, the insertion portion 66 may have the same diameter as the screw portion 68, and a flange portion having an enlarged diameter only at the boundary portion with the screw portion 68 may be provided. That is, the shape is not particularly limited as long as the distance D is secured between the upper surface 80A of the nut 80 and the lower surface 74A of the mounting portion 74 when the nut 80 is fastened to the screw portion 68.

  Further, in the present embodiment, the temporary fixing bolt 62 has been described as a press-fit type in which the bolt 62 is press-fitted into the lower surface 52A of the mounting plate 52, but a screw-in type in which the bolt 52 is screwed into the lower surface 52A may be used.

  Furthermore, although the transmission 20 and the base 71 have been described as separate members in the present embodiment, they may be integrally formed.

DESCRIPTION OF SYMBOLS 10 Temporary fixing structure 12 of engine mount Front side member 14 Engine mount 16 Engine mount bracket 20 Transmission 62 Temporary fixing bolt (fastening bolt)
66 Insertion part 68 Screw part 71 Base 78 Insertion hole 80 Nut

Claims (1)

A front side member that is a vehicle skeleton member extending in the vehicle front-rear direction at a side portion on the vehicle front side;
An engine mount sub-assembled to the front side member;
An engine mount bracket that is supported against vibration by the engine mount;
A transmission that forms a part of the engine unit, a base that is positioned below the engine mount bracket when the vehicle is assembled is formed at the top, and an insertion hole that extends in the vertical direction is formed in the base;
The insertion portion has an insertion portion that can be inserted into the insertion hole and a screw portion that is formed on a lower end side of the insertion portion and is screwed with a nut. The insertion portion has an axial length longer than an axial length of the insertion hole. A fastening bolt in which a diameter-expanded portion having a diameter larger than that of the screw portion is formed in a portion adjacent to the screw portion;
Engine mount temporary fixing structure.