JP4239651B2 - Support structure of drive unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support structure for a drive device such as an engine or a transmission.
[0002]
[Prior art]
There exists patent document 1 as a support structure of the conventional drive device. In Patent Literature 1, one end of a pair of brackets is fixed to a pair of left and right side rails extending in the front-rear direction of the vehicle, and a leaf spring member attached to a driving device is supported from below on the other end side of each bracket. A so-called drop structure is disclosed.
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 8-4345
[Problems to be solved by the invention]
An example of a vehicle in which a chassis frame is configured by a pair of left and right side rails is a truck. In the case of such a track, a body such as a cab is mounted on the upper portion of the chassis frame, and the drive device is often disposed below the cab. The shape of the cab is such that the portion located above the drive device is used as a storage space for the drive device, and is recessed upward from the center of the floor to the front of the drive device. The foot will be located.
[0005]
For this reason, when the vehicle collides against the structure from the front side, the engine or transmission is prevented from moving to the front side of the vehicle due to the impact of the collision in order not to reduce the foot space of the occupant. It is common to provide a stopper member that suppresses forward movement. However, the configuration described in Patent Document 1 does not have such a stopper member configuration. In general, when a stopper member is provided, the stopper member is added to the existing components, resulting in an increase in the number of parts and weight, resulting in an increase in production cost.
An object of the present invention is to propose a support structure for a drive device that can reliably suppress the movement of the drive device in the event of a collision while suppressing production costs.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a pair of brackets according to the present invention, one end of which is fixed to a pair of left and right side rails extending in the vehicle longitudinal direction, the other end extending inward in the vehicle width direction and the other ends facing each other. In the drive device support structure having both ends in the vehicle width direction connected to the other ends of the pair of brackets and a suspension member that supports the drive device downward at the central portion, the pair of brackets are connected to the bottom and the vehicle. It has a tongue that is fixed to the upper part of the elastic member interposed between the wall part provided in the front-rear direction and the bottom part of the bracket located between the wall part in the vehicle front-rear direction and to which both ends of the suspension member are fastened It is characterized by that.
[0007]
According to the present invention, when the vehicle collides with the structure from the front or the rear, either of the wall portions in the vehicle front-rear direction of the pair of left and right brackets to which both ends of the suspension support member that supports the drive device are connected is connected. Since the tongue piece fixed to the upper part of the elastic member interposed at the bottom part of the bracket located between the wall parts in the vehicle front-rear direction and the both ends of the suspension member fasten collides with each other. Movement is restricted by the tongue piece and the wall portion in the longitudinal direction of the vehicle. If each bracket is provided with a reinforcing member that is bridged between walls in the vehicle longitudinal direction so that it is positioned above the tongue, the strength of the wall in the vehicle longitudinal direction increases in the vehicle longitudinal direction. The movement in the direction is more reliably defined, and when the drive device 1 moves upward due to the impact at the time of collision, the upward movement of the tongue piece is restricted by the reinforcing member.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 4, reference numeral 1 denotes a drive device in which the engine 2 and the transmission 3 are integrated. The drive device 1 is mounted on the pair of left and right side rails 4 and 5 via the engine mount 6 on the front side of the engine 2 and the transmission 3 side on the rear side of the side rails 4 and 5 by a support structure described below. It is attached to. The side rails 4 and 5 together with a plurality of cross members 43 fixed at both ends to the side rails 4 and 5 constitute a ladder-like chassis frame 7. A cab 40 constituting the body is mounted on the front portion of the chassis frame 7, and a loading platform 42 constituting the body is mounted on the chassis frame 7 behind the cab 40. The shape of the cab 40 is such that the portion located above the engine 2 serves as a storage space for the drive device, and is recessed upward from the center of the floor 41 to the front side of the engine 2. It is formed so that the foot of the occupant 44 is located. In FIG. 4, the side rail shows only one side.
[0009]
As shown in FIG. 1, the side rails 4 and 5 are each extended in the vehicle front-rear direction (hereinafter referred to as “front-rear direction A”) indicated by an arrow A. As shown in FIG. 2, the side rails 4 and 5 have a U-shaped cross section and are arranged so that the respective opening sides face the center in the vehicle width direction W and face each other. On the side rails 4 and 5 in the vicinity where the transmission 3 side is supported, phosphorus hoses 8 and 9 having a partially closed cross-sectional structure of the side rails 4 and 5 are fastened to the inner surfaces of the side rails 4 and 5 with bolts and nuts, respectively. ing.
[0010]
Flange portions 14 and 15 provided at one ends 10a and 11a of mount brackets 10 and 11 serving as a pair of brackets are fastened and fixed to the phosphorus hoses 8 and 9 by bolts and nuts. The other ends 10b and 11b of the mount brackets 10 and 11 extend inward in the vehicle width direction W and are arranged to face each other. As shown in FIG. 4, the mount brackets 10 and 11 have a U-shaped cross section, and are arranged so that the opening side is positioned upward. For this reason, the mount bracket 10 is disposed such that the wall portions 101 and 102 are positioned in the front-rear direction A and the wall portion 103 (hereinafter referred to as “bottom portion 103”) is positioned below the mount bracket 10. The wall portions 111 and 112 are positioned at A, and the wall portion 113 (hereinafter referred to as “bottom portion 113”) is positioned below the wall portions 111 and 112.
[0011]
Cylindrical cushion rubbers 16 and 17 serving as elastic members are attached to the bottom portions 103 and 113 positioned between the wall portions 101 and 111 and the wall portions 102 and 112, and vibrations generated from the drive device 1 are chassis. Transmission to the frame 7 side is reduced. As shown in FIG. 2, the bottom portions 103 and 113 are inclined downwardly from the inner side to the outer side in the vehicle width direction W. Plate-like tongue pieces 18 and 19 having inclined portions 18a and 19a substantially parallel to the bottom portions 103 and 113 are attached to the upper portions of the cushion rubbers 16 and 17, respectively. When the tongue pieces 18 and 19 are attached to the cushion rubbers 16 and 17, their tips 18d and 19d are positioned between the wall portions 101 and 111 and the wall portions 102 and 112, and their inner ends 18e and 19e are the vehicle width. It extends in the direction W. Therefore, the cushion rubbers 16 and 17 are attached to the mount brackets 10 and 11 while being sandwiched between the bottom portions 103 and 113 and the tongue pieces 18 and 19. Adjustment members 20 and 21 for forming a substantially horizontal plane on the inclined portions 18a and 19a are fixed by welding. As shown in FIGS. 5 and 6, a plurality of holes 22 and 23 serving as attachment portions are vertically passed through the adjusting members 20 and 21 and the inner ends 18 e and 19 e of the tongue pieces 18 and 19, respectively. Is formed. Between the wall portions 101 and 102 and the wall portions 111 and 112, reinforcing members 29 and 30 welded to both the wall portions 101 and 102 and the wall portions 111 and 112 are positioned above the tongue pieces 18 and 19, respectively. It is arranged like this.
[0012]
On the transmission 3 side of the driving device 1, a mount boss 3A having a flat upper surface is formed. The mount boss 3A extends in the vehicle width direction W, and is bolted to the holes 27, 27, 28, 28 and the holes 22, 22, 23, 23 which are connecting portions formed at both ends 24a, 24b. Is attached to the central portion 24c of the support bracket 24 which becomes a suspended support member connected by being tightened with a nut.
[0013]
A plurality of holes 25... Are formed in the central portion 24 c of the support bracket 24 and serve as attachment portions that are arranged in the vehicle width direction W and penetrate the support bracket 24 in the vertical direction. A screw hole 26 is formed in the mount boss 3 </ b> A facing each hole 25. The support bracket 24 supports the drive device 1 below by joining the upper surface of the mount boss 3A to the lower surface of the central portion 24c and screwing a bolt into each screw hole 26 from the holes 25.
[0014]
In the support structure having such a configuration, the phosphorus hoses 8 and 9 are fastened to the side rails 4 and 5 in the production line of the chassis frame 7 (not shown). Cushion rubbers 16 and 17, tongue pieces 18 and 19 and adjustment members 20 and 21 are assembled in advance to the phosphorus hoses 8 and 9, and the mount brackets 10 and 11 in an assembly state are fastened. In the production line on the drive device 1 side, the engine 2 and the transmission 3 are integrated, and a support bracket 24 is attached to the mount boss 3A. The drive device 1 and the chassis frame 7 manufactured in these lines are connected to the brackets 10 and 11 on both ends 24a and 24b of the mount bracket 24 from above the mount brackets 10 and 11 of the chassis frame 7 in the mounting line. Are placed on the tongue pieces 18 and 19 and the adjusting members 20 and 21 which constitute the other ends 10b and 11b of the head. And in the state which supported the drive device 1 with the support bracket 24, each hole 27, each hole part 22, each hole 28, each hole part 23 are aligned, a bolt is inserted in each, and it fastens with a nut and supports. Both ends 24 a and 24 b of the bracket 24 are connected to the other ends 10 b and 11 b of the pair of brackets 10 and 11.
[0015]
In order to facilitate positioning of the support bracket 24 with respect to the mount brackets 10 and 11, for example, as shown in FIG. 6, pins 31 and 32 are provided on the upper portions of the brackets 10 and 11, and holes through which the pins 31 and 32 are inserted. If 34 and 35 are formed at both end portions 24a and 24b of the support bracket 24, the holes 34 and 35 and the pins 31 and 32 are placed in alignment when the support bracket 24 is placed on the brackets 10 and 11. do it.
[0016]
For example, when a vehicle having such a structure collides with the structure 80 shown in FIG. 4 from the front or the rear, both ends 24a and 24b of the support bracket 24 that supports the drive device 1 downward are connected. The opposing edges 18b, 19b, 18c, 19c of the tongue pieces 18, 19 collide with any of the wall portions 101, 111 or the wall portions 102, 112 of the mount brackets 10, 11, and the drive device 1 Movement in the vehicle longitudinal direction A is restricted. For this reason, the foot space of the passenger | crew 44 of the cab 40 is securable. Further, since the wall portions 101 and 102 and the tongue piece 18 are constituent members of the mount bracket 10, and the wall portions 111 and 112 and the tongue piece 19 are constituent members of the mount bracket 11, it is not necessary to provide a stopper as a separate member. Reduce production costs.
[0017]
Reinforcing members 29 and 30 that are bridged to the wall portions 101 and 102 and the wall portions 111 and 112 are disposed above the tips 18d and 19d of the tongue pieces 18 and 19, respectively. And the movement of the driving device 1 in the front-rear direction A can be more reliably suppressed. Further, even if the rising moment indicated by the arrow M in FIG. 4 acts on the driving device 1 due to the impact at the time of the collision and the tongue pieces 18 and 19 move upward, the movement is restricted by the reinforcing members 29 and 30. Can do.
[0018]
Even if the driving device 1 has a moment in the rolling direction indicated by an arrow L in FIG. 2 due to an impact at the time of collision and the tongue pieces 18 and 19 move upward, the movement is suppressed by the reinforcing members 29 and 30. be able to. Thus, by devising the arrangement of the reinforcing members 29 and 30 that are constituent members of the mount brackets 10 and 11 and the tongue pieces 18 and 19 to which the support bracket 24 is fastened, a stopper is not provided as a separate member. The production cost can be reduced.
[0019]
【The invention's effect】
According to the present invention, when the vehicle collides against the structure from the front or the rear, any of the wall portions in the vehicle front-rear direction of the pair of left and right brackets to which both ends of the suspension support member that supports the drive device are connected is connected. Since the tongue piece fixed to the upper part of the elastic member interposed between the bottom part of the bracket located between the wall parts in the longitudinal direction of the vehicle and fastened at both ends of the suspension member collides, the longitudinal direction of the drive device Can be restricted by the tongue piece and the wall in the vehicle front-rear direction. Further, since the wall portion and the tongue piece are structural members of the bracket that supports the drive device, it is not necessary to provide a stopper as a separate member, and production costs can be reduced.
According to the present invention, the reinforcing member bridged between the wall portions in the vehicle front-rear direction is arranged above the tongue piece, whereby the strength of the wall portion in the vehicle front-rear direction increases in the vehicle front-rear direction, and the front and rear of the drive device The movement in the direction can be more reliably defined, and the upward movement of the tongue piece can also be restricted by the reinforcing member.
[Brief description of the drawings]
FIG. 1 is a plan view showing a configuration of a support structure of a driving apparatus according to an embodiment of the present invention.
FIG. 2 is a front view showing a configuration of a support structure of the driving device.
FIG. 3 is a partially enlarged perspective view showing a configuration of a support structure of the driving device.
FIG. 4 is a side view showing a mounting state of the driving device with respect to the side rail.
FIG. 5 is a plan view in which the support structure of the drive device is partially disassembled.
FIG. 6 is a front view showing a mounting process on the drive device side with respect to the chassis frame side;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Drive device 4,5 A pair of side rail 10,11 A pair of bracket 10a, 11a One end 10b, 11b The other end 18,19 Tongue piece 24 Suspension support member (support bracket)
24a, 24b Both ends 24c Central part 25 ... Mounting parts 27, 28 Connecting parts 29, 30 Reinforcement member A Vehicle longitudinal direction W Vehicle width direction

Claims (2)

A pair of left and right side rails extending in the longitudinal direction of the vehicle, a pair of brackets each having one end fixed to each side rail, the other end extending inward in the vehicle width direction, and the other ends facing each other, and both end portions in the vehicle width direction Is a support structure of a drive device having a suspension member connected to the other end of the pair of brackets and supporting the drive device downward at the center portion,
The pair of brackets are fixed to an upper portion of an elastic member interposed between a bottom portion and a wall portion provided in the vehicle front-rear direction and a wall portion in the vehicle front-rear direction, and the suspension support portion. A support structure for a drive device, comprising a tongue piece to which both ends of a material are fastened. The drive device support structure according to claim 1,
The drive device support structure according to claim 1, wherein the pair of brackets each include a reinforcing member disposed above the tongue piece and bridged between the wall portions in the vehicle front-rear direction.

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