JP6679154B2 - Power unit support structure - Google Patents

Description

  The present invention relates to a support structure for a power unit, which is coupled with an engine, a transmission, and a differential device, and supports a power unit arranged in a front-rear direction in an engine room of a vehicle.

  Conventionally, in order to reduce the weight of a power unit in a cab-over vehicle such as an automobile, an engine, a transmission, and a differential device are combined into a unit, and the unit is placed vertically in the engine room at the front of the vehicle. ing. Further, in this type of front engine / front drive (FF) type vertical power unit structure, an adapter made of a rigid body having a cylindrical or grooved cross section is provided between the transmission and the differential device so as to rigidly connect them. It has been proposed that cushion cushion mounts support the side or front of the differential device to mitigate the effects of the rotational reaction force of the tire (see, for example, Patent Document 1).

Japanese Patent No. 2929794 (see paragraphs 0012 to 0021 and FIGS. 1 to 4)

  By the way, in recent years, in particular, a compact cab-over type vehicle has been adopted in order to reduce the weight by adopting a structure in which an engine, a transmission, and a differential device are combined and vertically placed in the engine room in the front-rear direction as in Patent Document 1. It is required to lower the floor of the cabin to improve the occupant's ability to get in and out of the cabin.It is a support structure that can lower the floor of the cabin. There is a demand for the development of a small-sized support structure that can support the balance in good balance.

  It is an object of the present invention to enable a so-called FF type vertical power unit to be supported by a small-sized support structure while reducing the floor of the cabin of a cab-over type vehicle.

In order to achieve the above-mentioned object, a support structure for a power unit of the present invention is a power unit in which an engine, a transmission, and a differential device are coupled in the front-rear direction of a vehicle and which supports the power unit arranged in the engine room of the vehicle in the front-rear direction. In the above support structure, a connecting member that connects the differential device to the transmission is provided such that the center of the differential device is located below the output shaft of the transmission, and the suspension member is provided below the connecting member. A space is formed in which a cross member in the left-right direction is arranged so as not to protrude below the differential device, and the suspension member includes left and right lower members coupled to left and right lower arms that support left and right front wheel tires. a said cross member for coupling said left and right lower member, The right and left of the front end of the lower member of the serial suspension member is attached to the upper cross-member via a joint member, said upper cross-member is characterized by being arranged to be positioned above the differential device.

A mount having elasticity is attached to the upper cross member at a position extending rearward, and the mount member supports the differential device in a suspended state by the joining member, the upper cross member and the mount. May be configured .

According to the present invention, the connecting member that connects the differential device to the transmission is provided so that the center of the differential device is located below the output shaft of the transmission, and the connecting member is provided below the connecting member in the left-right direction. Since a space for arranging the cross member is formed and the cross member is arranged so as not to protrude below the differential device, it is possible to minimize the cross member of the suspension member protruding below the differential device. Therefore, it is possible to reduce the floor of the cabin.

It is a side view of 1st Embodiment of the support structure of the power unit which concerns on this invention. It is the perspective view which looked at 1st Embodiment from the slanting upper part. FIG. 3 is a perspective view of the first embodiment seen from diagonally below. It is a one part perspective view of 1st Embodiment. It is a front view of another part of 1st Embodiment. It is a perspective view of the modification of 1st Embodiment. It is a one part perspective view of 2nd Embodiment. It is a perspective view of the modification of 2nd Embodiment.

<First Embodiment>
A first embodiment of a power unit support structure according to the present invention will be described in detail with reference to FIGS. 1 to 4.

  As shown in FIG. 1, a power unit U according to the present embodiment is a front engine / front drive in which an engine 1, a transmission 2 and a differential device 3 are combined and arranged in the engine room of a small cabover type vehicle in the front-rear direction. It is a vertical structure of (FF) type, a connecting member 5 is provided between the transmission 2 and the differential gear 3, and the center P of the differential gear 3 is below the center line L of the output shaft of the transmission 2. The differential device 3 is connected to the transmission 2 by the connecting member 5 so that the suspension member 6 is located below the connecting member 5 in the left-right direction of the H-shaped plan view H-shaped suspension member 6 (see FIGS. 2 and 3). A space S in which the cross member 6b is arranged is formed.

  As shown in FIGS. 2 and 3, the suspension member 6 connects the left and right lower members 6a, 6a connected to the left and right lower arms 8, 8 supporting the left and right front wheel tires, and the centers of the lower members 6a, 6a. As described above, the left and right cross members 6b are integrally provided, and the cross member 6b is arranged in the space S below the connecting member 5. The rear ends of both lower members 6a, 6a of the suspension member 6 are joined to the left and right side frames 10 (see FIG. 3) that form the frame structure of the vehicle.

  Further, as shown in FIGS. 2 to 4, upper cross members 12b are attached to the front ends of both lower members 6a, 6a of the suspension member 6 via pipe-shaped joining members 12a, 12a, respectively. 12b is arranged so as to be located above the differential device 3, and a pair of cylindrical mounts 12c, 12c made of elastic members such as rubber are attached to the center of the upper cross member 12b at positions extending rearward. As shown in FIG. 5, plate-like brackets 12d are bridged and fixed between the lower surfaces of both mounts 12c, 12c, and these joining members 12a, 12a, upper cross members 12b, mounts 12c, 12c and brackets 12d. The mount member 12 is configured by the above.

  The upper portion of the differential device 3 is supported by the bracket 12d by, for example, a bolt B, and the upper and lower vibrations of the differential device 3 are absorbed by the elasticity of the mounts 12c and 12c. . The engine 1 is supported by the body via a mount similar to the mount 12c so that the rotational reaction force of the engine 1 is absorbed.

  Therefore, according to the above-described first embodiment, the connecting member that connects the differential device 3 to the transmission 2 so that the center P of the differential device 3 is located below the center line L of the output shaft of the transmission 2. 5 is provided, and the space S in which the cross member 6b of the suspension member 6 in the left-right direction is arranged is formed below the connecting member 5, so that the cross member 6b of the suspension member 6 protrudes below the differential device 3. Can be prevented, and even a vehicle equipped with the power unit U having a vertically installed structure can have a lower floor, and the lowering of the floor facilitates expansion of the luggage compartment of the vehicle.

  Moreover, since the mount member 12 coupled to the suspension member 6 supports the upper portion of the differential device 3 in a state of being suspended from above, the rotational reaction force of the tire acting on the differential device 3 and the center of gravity of the power unit U are exerted. The acting gravity can be effectively absorbed by the mount member 12, and the differential device 3 can be stably supported even if the mount member 12 is small.

  Further, by forming the space S below the connecting member 5, the stabilizer can be easily arranged by utilizing this space S.

<Modification>
As a modification of the first embodiment, instead of the suspension member 6 described above, as shown in FIG. 6, a U-shaped pipe 14b is attached to the rear surface of the lower member 14a in the left-right direction to form the suspension member 14, and the pipe 14b is formed. The rear portion in the left-right direction may be disposed as a cross member in the space S formed below the connecting member 5.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIG. Note that, in the second embodiment, the basic configuration of the power unit U is the same as that of the first embodiment described above, so the following description also refers to FIG. 1 and mainly the points that differ from the first embodiment will be described.

  In the second embodiment, as shown in FIG. 7, instead of the above-mentioned suspension member 6, a suspension member 16 made of a U-shaped pipe in the left-right direction is provided as shown in FIG. The suspension member 16 is arranged so as to face rearward, and the left and right upper cross members 17b are attached to the left and right ends of the left and right front portion of the suspension member 16 via the joining members 17a and 17a. A pair of columnar mounts 17c, 17c made of an elastic member such as rubber are attached to the center by extending rearward, and a plate-shaped bracket 17d is hung between the upper surfaces of both mounts 17c, 17c to be fixed. , 17a, upper cross member 17b, mounts 17c, 17c, and bracket 17d constitute a mount member 17. , For example by bolts, the point where the bottom of the differential device 3 adapted to support in a state of being placed on a bracket 17d is different from the first embodiment.

  Therefore, according to the second embodiment, since the lower portion of the differential device 3 is supported from below by the mount member 17 coupled to the suspension member 16, the rotational reaction force of the tire acting on the differential device 3 and the power unit U. It becomes possible to effectively absorb the gravity acting on the center of gravity of the mount member 17 by the mount member 17, and the differential device 3 can be stably supported even if the mount member 17 is small.

<Modification>
As a modified example of the second embodiment, mounts 19 and 19 that replace the mounts 17c and 17c described above are attached by extending rearward on the rear surface of the upper cross member 17b in the left-right direction as shown in FIG. The plate-shaped bracket 20 may be bridged and fixed between the lower surfaces of the brackets 19 and 19, and the upper portion of the differential device 3 may be supported by the bracket 20 in a state of being suspended from above by, for example, bolts.

  The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, an example is described in which the cabin is lowered to improve the passenger entry / exitability of a small cabover type vehicle, but the passenger entry / exitability of the passenger is not limited to the small vehicle. Therefore, the present invention can be applied even when the floor of the vehicle is lowered.

DESCRIPTION OF SYMBOLS 1 ... Engine 2 ... Transmission 3 ... Differential device 5 ... Connecting member 6,14,16 ... Suspension member 6a ... Lower member 6b ... Cross member 12 ... Mounting member P ... Center L ... Output shaft center line S ... Space

Claims (2)

A support structure for a power unit, in which an engine, a transmission, and a differential device are coupled in the front-rear direction of a vehicle, and which supports a power unit arranged in the engine room of the vehicle in the front-rear direction,
A connecting member that connects the differential device to the transmission is provided such that the center of the differential device is located below the output shaft of the transmission.
A space is formed below the connecting member so that the cross member in the left-right direction of the suspension member is arranged so as not to protrude below the differential device,
The suspension member includes left and right lower members that are joined to left and right lower arms that support the left and right front tires, and the cross member that joins the left and right lower members ,
The front ends of the left and right lower members of the suspension member are attached to the upper cross member via a joining member,
The support structure for a power unit, wherein the upper cross member is disposed above the differential device . A mount having elasticity is attached to the upper cross member at a position extending rearward,
The support structure for a power unit according to claim 1 , wherein the joint member, the upper cross member, and the mount constitute a mount member that supports the differential device in a suspended state.

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