JP2011031844A - Mount structure of power unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mount structure of a power unit capable of improving workability in installation, and separable only when a vehicle collides. <P>SOLUTION: This mount structure of the power unit is provided by fastening a fixing bracket 19 having a bolt inserting hole 19c and fixed to the power unit 1 and a power mount member (a vibration control support member) 10 fixed to a vehicle body 11, by a bolt 20 inserted into the bolt inserting hole 19c. The fixing bracket 19 is formed with a cutout part 19d for permitting falling-off of the bolt 20 to the vehicle front from the bolt inserting hole 19c when the vehicle collides, and a connecting member 21 is fixed to a nut part 22 of the bolt 20 for regulating positioning to the fixing bracket 19 and the movement in the falling-off direction of the bolt 20. The connecting member 21 permits the movement in the falling-off direction of the bolt 20 by being damaged when the vehicle collides. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power unit mounting structure in which a fixing bracket fixed to one of a vehicle body or a power unit and a vibration-proof support member fixed to the other are fastened by bolts.

  In an automobile, in order to suppress the influence on the passenger compartment at the time of a vehicle collision, a structure in which the power unit is dropped from the vehicle body at the time of a frontal collision may be employed. For example, in Patent Document 1, an engine bracket fixed to a power unit and an engine mount fixed to a vehicle body are fastened with fixing bolts, and a concave groove that breaks at the time of a vehicle collision is formed around a bolt hole of the engine bracket. A formed structure has been proposed.

  Further, from the viewpoint of improving workability when the power unit is assembled to the vehicle body, for example, Patent Document 2 discloses that a bush fixing notch portion is formed in a support arm portion of an engine bracket, thereby the bush inner cylinder and the bracket bolt. A structure that eliminates the need for alignment with the hole has been proposed.

JP 2008-74310 A Japanese Patent Laid-Open No. 10-16573

  By the way, in the mount structure according to Patent Document 1, there is a problem that when the power unit is assembled, it takes time to align the fixing bolt and the bolt hole of the engine bracket, and the assembling workability is low.

  Further, the mount structure according to Patent Document 2 can improve the workability of assembling the power unit, and when a notch portion extending in the vehicle front-rear direction is formed on the bracket, a function of dropping the power unit at the time of collision can be obtained. However, when such a notch is formed, if the bolt fastening force decreases due to road surface vibration, engine vibration, or the like during acceleration / deceleration, the power unit may drop off even during normal travel.

  The present invention has been made in view of the above-described conventional situation, and it is an object of the present invention to provide a mounting structure for a power unit that can be improved in assembling workability and is dropped only at the time of a vehicle collision.

  The present invention has a bolt insertion hole, a fixing bracket fixed to one of the vehicle body and the power unit, and a vibration-proof support member fixed to either one of the bolts inserted into the bolt insertion hole. A power unit mounting structure for fastening, wherein the fixing bracket is formed with a notch for allowing the bolt to fall from the bolt insertion hole to the front or rear of the vehicle in the event of a vehicle collision. Positioning with respect to the fixing bracket is performed on at least one of the head and the nut portion, and a connecting member that restricts the movement of the bolt in the drop-off direction is fixed. It is characterized by allowing movement in the drop-off direction.

  According to the mount structure of the present invention, since the notch portion is formed in the bolt insertion hole of the fixed bracket, both ends of the bolt are inserted through the notch portion in a state where the bolt is inserted into the vibration isolating support member. It can be moved in the radial direction and inserted into the bolt insertion hole, and the alignment of the vibration-proof support member and the bolt insertion hole in the axial direction can be made unnecessary, thereby improving the workability when the power unit is assembled.

  In the present invention, since the connecting member for restricting the movement of the bolt in the drop-off direction is fixed to the head or the nut portion of the bolt, even when the fastening force of the bolt is reduced during normal running, It is possible to prevent the power unit from moving in the direction of falling off, that is, the power unit from falling off.

  Moreover, since the said connection member accept | permits the movement to the dropping direction of a volt | bolt by being damaged at the time of a vehicle collision, a power unit can be dropped from a vehicle body at the time of a vehicle collision, and the influence on a vehicle interior can be suppressed.

It is a schematic plan view of the mount structure of the power unit by Example 1 of this invention. It is a side view of the mount structure. It is a rear view of the mount structure. It is a perspective view of the mount structure. It is a partial cross section side view of the said mount structure. It is a side view of the mount structure by Example 2 of this invention. It is a schematic diagram which shows the damaged state of the connection member of the said mount structure. It is a schematic plan view of the mount structure of the power unit by Example 3 of this invention. It is a perspective view of the mount structure by Example 4 of this invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 5 are views for explaining a power unit mounting structure according to a first embodiment of the present invention.

  In the figure, reference numeral 1 denotes a front engine / rear drive type power unit. This power unit 1 has a structure in which a clutch housing 3 and a transmission case 4 are integrally coupled to a rear wall surface of an engine body 2 placed vertically on a crankshaft.

  A drive shaft 5 extends rearward from the transmission case 4 via a universal joint 8, and axles 7 a and 7 a for driving left and right rear wheels 7 and 7 are connected to the drive shaft 5 via a rear differential 6. ing.

  The left and right wall portions of the engine body 2 constituting the front portion of the power unit 1 are elastically supported by the vehicle body 11 via engine mount members 9 and 9. The rear wall portion of the transmission case 4 constituting the rear portion of the power unit 1 is fastened to the vehicle body 11 by the mount structure of the first embodiment.

  In the mount structure of the first embodiment, a fixing bracket 19 fixed to the rear wall portion of the transmission case 4 and a power mount member (vibration support member) 10 fixed to the vehicle body 11 are fastened by bolts 20. By fixing, the rear portion of the power unit 1 is elastically supported. The bolt 20 has a shaft portion 20a, a head portion 20b formed at one end of the shaft portion 20a, and a nut portion 22 screwed to the other end.

  In the power mount member 10, the inner cylinder 16 is inserted into the axial center of the outer cylinder 15, and the inner cylinder 16 and the outer cylinder 15 are integrally connected by baking a rubber member 17 interposed therebetween. It has a structure. The engine mount member 9 is also composed of an inner cylinder, an outer cylinder, and a rubber member, like the power mount member 10.

  When viewed from the front of the vehicle, the fixed bracket 19 is arranged to be displaced to the right from the center in the vehicle width direction. The fixing bracket 19 includes a fixing portion 19a fixed to the transmission case 4 with three fixing bolts 12, and a pair of left and right fastening portions 19b and 19b extending downward from the fixing portion 19a and bent forward. Are integrally connected. Bolt insertion holes 19c are formed at the front end portions of the left and right fastening portions 19b.

  A pair of mounting brackets 13 projecting outward in the vehicle width direction are attached to the lower surface of the outer cylinder 15 of the power mount member 10 by welding. The mounting bracket 13 is fixed to the vehicle body 11 with bolts (not shown).

  A shaft portion 20a of the bolt 20 is inserted into the inner tube 16 of the power mount member 10, and the inner tube 16 is fastened to the fixing bracket 19 by tightening a nut portion 22 to a tip portion of the shaft portion 20a. Fastened and fixed between the portions 19b and 19b.

  The left and right fastening portions 19b of the fixing bracket 19 are formed with notches 19d that open the bolt insertion holes 19c toward the front of the vehicle. When the power unit 1 moves rearward together with the fixed bracket 19 due to an impact force from the front of the vehicle body at the time of a vehicle collision, the bolt 20 moves relatively forward via the notch 19d and falls off the fixed bracket 19.

  A connecting member 21 for locking the nut portion 22 is fixed to the nut portion 22 of the bolt 20. The connecting member 21 includes a washer portion 21a in which a bolt hole 21c is formed, and a rotation preventing portion 21b extending rearward after the washer portion 21a.

  The anti-rotation portion 21b has a locking piece 21d that extends in the direction opposite to the direction in which the bolt 20 is dropped and is bent inward in the vehicle width direction. The locking piece 21d is inserted into a locking hole 19e formed on the rear side of the bolt insertion hole 19c of the fixed bracket 19. As a result, the connecting member 21 prevents the nut portion 22 from rotating, positions the fixed bracket 19, and restricts the bolt 20 from moving in the drop-off direction. Further, the locking piece 21d of the connecting member 21 is damaged by an impact force at the time of a vehicle collision and allows the bolt 20 to move in the drop-off direction.

  Thus, according to the present embodiment, the notch portion 19d for opening the bolt insertion hole 19c of the fixing bracket 19 fixed to the power unit 1 forward is formed. Therefore, when the power unit 1 is assembled, the shaft portion 20a of the bolt 20 is assembled. Can be positioned in the bolt insertion hole 19c by moving both the protruding portions in the radial direction through the notches 19d in a state where both ends of the shaft portion 20a are protruded. it can. Therefore, since it is not necessary to align the inner cylinder 16 and the bolt insertion hole 19c in the axial direction, it is possible to improve the assembling workability of the power unit 1 as compared with the case where the bolt 20 is inserted in the aligned state.

  Further, in this embodiment, since the locking piece 21d of the connecting member 21 is locked to the locking hole 19e of the fixed bracket 19, the movement of the bolt 20 in the drop-off direction can be restricted, and the fastening force by the bolt 20 Even when the power is lowered, the power unit 1 can be prevented from falling off during normal driving.

  On the other hand, when an impact force from the front is applied to the power unit 1 due to a vehicle collision, the power unit 1 moves rearward together with the fixed bracket 19. With this rearward movement, the locking piece 21d of the connecting member 21 is broken, the bolt 20 moves relative to the front through the notch 19d and falls off from the fixed bracket 19, and the gear case 4 portion of the power unit 1 is the vehicle. It will fall off the body 11. As a result, it is possible to avoid that the impact absorbing action of the vehicle body is impaired due to the power unit 1, and the impact load can be absorbed.

  Further, in this embodiment, since the existing connecting member 21 provided as a rotation preventing member for the nut portion 22 can be used as it is, it is possible to prevent an increase in the number of parts and avoid an increase in cost.

  6 and 7 show a mount structure according to Embodiment 2 of the present invention. In the second embodiment, the fixing bracket 25 includes a fixing portion 25a fixed to the power unit and a pair of fastening portions 25b and 25b extending rearward from the fixing portion 25a. The left and right fastening portions 25b are formed with bolt insertion holes 25c, and the bolt insertion holes 25c are formed with notches 25d that open forward.

  Then, the connecting member 21 locks the locking piece 21d to the rear edge of the fastening portion 25b, thereby preventing the nut portion 22 from rotating and preventing the bolt 20 from moving in the drop-off direction. Yes. In the second embodiment, the same effect as in the first embodiment can be obtained.

  In the first embodiment, the front engine / rear drive type power unit has been described as an example. However, the present invention can also be applied to a front engine / front drive type power unit as shown in FIG. .

  This power unit 1 'has a structure in which a clutch housing 3' and a transmission case 4 'are integrally coupled to a side surface in the vehicle width direction of a horizontally mounted engine body 2'. Axles 30a, 30a for driving the left and right front wheels 30, 30 are connected to the transmission case 4 'via a built-in front differential 29.

  The power unit 1 'is connected to the right side of the engine body 2', the engine mount members 9 and 9 attached to the left side of the transmission case 4 ', and the power mount member 10 attached to the rear part of the engine body 2'. The vehicle body 11 is elastically supported.

  Also in the third embodiment, the same effect as in the first embodiment can be obtained by adopting the same mounting structure as in the first embodiment.

  FIG. 9 is a diagram for explaining a fourth embodiment of the present invention, in which the same reference numerals as those in FIG. 4 denote the same or corresponding parts.

  In the fourth embodiment, the power mount member 10 'is fixed to the power unit, and the fixing bracket 19' is fixed to the vehicle body.

  A mounting bracket 13 'is fixed to the outer cylinder 15' of the power mount member 10 'by welding, and the mounting bracket 13' is fixed to the power unit by bolting.

  The left and right fastening portions 19b 'and 19b' of the fixing bracket 19 'have a notch portion 19d' that allows the bolt 20 'to drop off in the event of a vehicle collision so that a bolt insertion hole 19c' is opened rearward of the vehicle. Is formed.

  A connecting member 21 'for restricting the movement of the bolt 20' in the drop-off direction is fixed to the nut portion 22 'of the bolt 20'.

  The connecting member 21 'allows the bolt 20' to move in the drop-off direction when the locking piece 21d 'is damaged at the time of a vehicle collision. With this configuration, the same effects as those of the first embodiment can be obtained in the fourth embodiment.

  In the above-described embodiment, the connecting member 21 is provided on the nut portion 22 side of the bolt 20, but the connecting member may be provided on the head side of the bolt, or may be provided on both.

1,1 'power unit 10, 10' power mount member (anti-vibration support member)
11 Vehicle body 19, 19 ', 25 Fixed bracket 19c, 19c', 25c Bolt insertion hole 19d, 19d ', 25d Notch 20, 20' Bolt 21, 21 'Connecting member

Claims (1)

It has a bolt insertion hole, and a fastening bracket fixed to one of the vehicle body or the power unit and a vibration isolating support member fixed to either one are fastened by a bolt inserted into the bolt insertion hole. The power unit mounting structure
Forming a notch in the fixing bracket that allows the bolt to drop from the bolt insertion hole to the front or rear of the vehicle in the event of a vehicle collision;
Positioning the fixing bracket on at least one of the head or nut of the bolt, and fixing a connecting member that restricts movement of the bolt in the drop-off direction,
The connecting structure of the power unit, wherein the connecting member is damaged at the time of a vehicle collision and allows the bolt to move in a drop-off direction.

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