JP3134708B2 - Power plant support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power plant support structure for supporting an engine and a transmission on a vehicle body base, and more particularly to a power plant for supporting a vertically mounted engine in a state in which a side surface of a main body is inclined in a vehicle width direction. Regarding the support structure.

[0002]

2. Description of the Related Art Conventionally, a power plant composed of an engine, a transmission, and the like is supported with good stability and durability at a localization value of a vehicle body base, and transmits vibration from the power plant as a vibration source to the vehicle body base as much as possible. There is a need to support the power plant, and various support structures for power plants have been proposed. For example, FIGS. 5 and 6 show a power plant including an engine 1 installed vertically in a vehicle body front-rear direction X, a clutch 2 and a transmission 3 integrally connected to the engine 1, and the power plant is arranged in a longitudinal direction. Is supported by the vehicle body base in the vehicle front-rear direction X. Here, the engine body 101 is mounted with its up-down direction oriented vertically, and the crankshaft L1, the front-rear horizontal axis L2, and the roll axis L3 that pass through the center of gravity G of the power plant substantially overlap in plan view. It also substantially coincides with the center line L0. In addition, the horizontal axis L2 in the front-rear direction, the roll axis L3, and the crankshaft L1 are often set at different positions vertically when viewed from the side.

As described above, in a power plant including a vertically mounted engine 1 in which the longitudinal direction of the engine main body 101 is oriented in the front-rear direction of the vehicle body, the mounting positions of the mounts for supporting the power plant on the base of the vehicle body are adjusted to the left and right. Often deployed in controls. That is, in the power plant support structure, the left and right front mounts 4 and 5 and the right and left rear mounts 6 and 7 of the power plant are moved with respect to the front-rear horizontal axis L2 in consideration of static weight distribution. ,
The left and right sides are arranged at equal intervals m, m, n, n. As a result, the load shared by each mount can be reduced as much as possible, the durability of each mount can be increased, and the spring constant can be reduced as much as possible to prevent the deterioration of the vibration absorption characteristics. Further, when the mounts are arranged symmetrically in the plan view as described above, the mounts on the front, rear, left, and right can be separated from the roll axis L3 by an appropriate amount to efficiently regulate the roll.

[0004] By the way, in the case of a vertical type engine in which the longitudinal direction of the engine body is oriented in the front-rear direction of the vehicle body, and the engine is mounted with its vertical direction oriented vertically, the engine height is relatively high. As a result, there is often a problem in securing the room size by setting the vehicle body design and lowering the floor. Therefore,
2. Description of the Related Art There has been known a vertical installation type inclined engine in which a side surface of a main body of the engine is inclined in a vehicle width direction.

[0005] In the case of a power plant including this vertical type inclined engine (not shown), a front-rear horizontal axis L2 extending horizontally in the front-rear direction through the center of gravity of the power plant.
The power plant becomes asymmetric in plan view with respect to (see L2 in FIG. 6). Moreover, in this power plant, the roll axis L3 (L3 in FIG.
) And the crankshaft L1 (see L1 in FIG. 6), respectively, and the vehicle center line L0 (see L0 in FIG. 5).
In many cases, the center of gravity, the horizontal axis L2 in the front-rear direction, and the like are largely shifted.

[0006]

If the power plant is left-right asymmetrical with respect to the horizontal axis L2 in the front-rear direction in plan view, a problem is likely to occur in the arrangement of the front, rear, left, and right mounts. That is, simply mounting the mounts on the left and right side walls before and after the power plant, respectively, does not mean that the mounts are arranged symmetrically with respect to the horizontal axis L2 in the front-rear direction. Does not. In addition, in order to efficiently regulate the roll by each mount, it is desired that each mount is separated from the roll shaft as much as possible. However, in this case, it is not desirable to separate each mount from the roll shaft in the vertical direction in order to reduce the floor. Further, there is a need for a power plant support structure with a simplified configuration and improved durability.

SUMMARY OF THE INVENTION An object of the present invention is to provide a power plant support structure capable of suppressing static weight distribution to a low level and suitable for roll regulation.

[0008]

According to a first aspect of the present invention, an engine and a transmission are integrally connected and a side surface of the engine is inclined in a vehicle width direction. In a power plant support structure for supporting a power plant with its longitudinal direction oriented in the vehicle longitudinal direction and supporting the power plant to a vehicle body base via a plurality of mounts, a left and right front side of the mount is provided. The mount is positioned at an equal distance from a longitudinal axis passing through the center of gravity of the power plant,
And the rear left and right mounts of the mount are sandwiched between the horizontal axis and the roll axis in plan view.
Position, one on the side of the transmission
Mounting, the other on top of the transmission
Characterized in that was.

According to a second aspect of the present invention, in the power plant support structure of the first aspect, one and the other of the left and right rear mounts are disposed at equal intervals from a horizontal axis in the front-rear direction. I do.

[0010]

According to the first aspect of the present invention, the power plant in which the engine and the transmission are integrally connected to each other is provided with left and right front mounts arranged at equal intervals from a front-rear horizontal axis passing through the center of gravity of the power plant. is supported by the rear mount of the left and right that are arranged by sandwiching in plan view the front-rear direction horizontal axis and the roll axis, in particular, left and right
Attach the front mount to the side of the engine and the rear
Attach one of the mounts to the side of the transmission,
Since the other is mounted on the upper part of the transmission, the load shared by each of these mounts is divided into four parts, which are relatively small, and it is easy to ensure the durability of each mount. In addition, the connection structure of the rear mount can be simplified,
The side mount relatively far from the roll axis.
It becomes easy to perform.

According to the second aspect of the present invention, in particular, since one and the other of the rear mounts are arranged at equal intervals from the horizontal axis in the front-rear direction, the shared load can be equalized.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The support structure of the power plant shown in FIGS. 1 and 2 is provided at the lower part of the center of a bus (not shown). This bus includes a pair of left and right side rails 11 arranged long in the vehicle front-rear direction X and first and second side rails 11 connecting these side rails to each other.
Cross members 12 and 13 (only two cross members are shown in FIG. 1) and the like are provided, and a ladder-shaped frame F is formed in plan view formed by these members. In addition, the power plant 14 is disposed at the center of the frame F in the front-rear direction, and is a midship type bus. The power plant 14 includes an engine 15 which is vertically disposed in a vehicle longitudinal direction X, a clutch 16 and a transmission 17 integrally connected to the engine 15, and a longitudinal direction of the power plant is directed in a vehicle longitudinal direction X at a vehicle base. It is supported by a certain frame F.

Here, the engine 15 is an in-line multi-cylinder engine, and its engine body 151 has left and right side walls along the arrangement direction of a plurality of cylinders (not shown) inclined in the vehicle width direction Y, that is, in the vehicle longitudinal direction. One of the left and right side wall surfaces extending in X is directed downward, that is, as shown in FIG.
It is arranged as an inclining engine that inclines. A well-known clutch 16 and a transmission 17 are sequentially connected to the rear end of the inclined engine 15 in a vertically oriented state.
Note that the power plant 1 having the inclined engine 15
As shown in FIG. 2, when viewed from the side, the rear part 4 is arranged with the rear part lower than the front part, and therefore, the crankshaft L1 is installed in a state of lowering rearward.

As shown in FIG. 3, the first cross member 12
Is curved in a U-shape, and both ends thereof are integrally connected to the left and right side rails 11, 11. The second cross member 13 has a straight shape and is disposed so as to be located above the transmission 17. The right side rail 11 has a power plant facing portion 111 which is a central portion thereof protruding in the vehicle side direction, thereby securing a space for mounting the power plant 14. In the power plant 14, an engine body 151, which is a front part thereof, is supported by the first cross member 12 via left and right front mounts 18, 19,
The rear transmission 17 is supported by the second cross member 13 via left and right rear mounts 20 and 21.

As shown in FIG. 3, one ends of a pair of left and right front arms 22, 23 are fixed to the inclined side wall surface of the engine body 151 by bolts (not shown). The other ends of the pair of left and right front arms 22 and 23 are connected to bifurcated connecting portions 221 and 231, respectively.
And the left and right insulators 24, 2
The left and right front brackets 26 and 27 are connected via the joint 5, and the base ends of the left and right front brackets 26 and 27 are integrally connected to the first cross member 12. The bifurcated connecting portions 221 and 231 are each provided with a pin (not shown) at the center thereof, and left and right insulators 24 and 25 made of cylindrical rubber are fitted on the pins.
Left and right front brackets 26 and 27 are welded to metal tubes (not shown) covering the outer peripheral portions of the 4 and 25.

On the other hand, the second cross member 13 disposed above the transmission 17 is a bar having an inverted U-shaped cross section. The left and right rear mounts 20 and 21 are located at two positions on the second cross member 13. Is deployed. That is, the second cross member 13 has the left U-shaped bracket 28 near the portion facing the vehicle body center line L0 and the right side rail 1
The right U-shaped bracket 29 is bolted to the vicinity of 1 in a state of being respectively suspended. Here, a pin (not shown) is hung at the center of the left U-shaped bracket 28, and an insulator 30, which is a cylindrical rubber, is externally fitted to the pin, and a metal tube (not shown) covering the outer peripheral portion of the insulator 30. ), The left rear bracket 32 is welded. The base end of the left rear bracket 32 is integrally connected to the center of the upper wall of the transmission 17.

At the center of the right U-shaped bracket 29, a pin (not shown) is hung.
Is bent, and the bent end 331 of the right rear arm 33 is welded to a metal cylinder (not shown) covering the outer peripheral portion of the insulator 31. As shown in FIG.
The main part is disposed immediately below the second cross member 13 and substantially in parallel with the second cross member 13, and its base end is integrally connected to the right side wall of the transmission 17. The front, rear, left and right mounts 18, 19, 20, and 21 can support the total weight of the power plant 14 by dividing it into four parts, and can reduce the vibration from the power plant 14 side to the frame F side. The rubber elastic modulus and the shape of each of the insulators 24, 25, 30, 31 are set so that sufficient durability can be ensured in consideration of an appropriate static weight distribution.

The power plant 14 including the inclined engine 15 and the like has a relatively small amount of protrusion from the upper surface of the pair of side rails 11 in the height direction, and moves the vehicle floor member 34 to a relatively low position. It can be deployed and a car body with a low flat floor can be formed relatively easily. Note that FIG.
Reference numeral 35 in FIG. 4 indicates a bracket for floor mounting. As shown in FIG. 1, the power plant 14 supported by such a support structure of the power plant has an output shaft 171 (which coincides with the crankshaft L1 here) of the transmission 17 serving as an output shaft thereof. It is set so as to coincide with the line L0 in plan view.

Further, since the power plant 14 includes the inclined engine 15 and the like, the horizontal axis L2 in the front-rear direction passing through the center of gravity G is displaced from the vehicle center line L0 by a distance a, and the roll axis passing through the center of gravity G is provided. L3 is the horizontal axis L in the front-rear direction
2 is set so as to intersect with the crankshaft L3 in a plan view and also in a side view. Particularly, in the power plant support structure, the left and right front mounts 18 and the right and left front mounts 18 and Reference numerals 19 are respectively arranged at positions of the interval b, and left and right rear mounts 20, 21 are arranged at positions of the interval c.

Further, the right rear mount 21 is connected to the transmission 17 through a right rear arm 33 extending in a direction away from the roll axis L3, thereby enhancing the roll rigidity of the power plant 14. In the support structure of the power plant, when the engine is driven, vibration noises due to backlash and the like generated in the drive unit of the engine 15, the clutch 16, and the transmission 17 cause the four insulators 24, 25,
The vibration noise is absorbed by the first and second motors 30 and 31, and the transmission of the vibration noise to the frame F and the passenger compartment can be reduced. Further, the torsional torque generated by the engine 15 is directly transmitted to the output shaft 171 of the transmission 17, and this torsional torque is captured as a roll displacement around the roll axis L3. This roll displacement is absorbed by a roll stopper composed of the right rear arm 33 and the right rear mount 21 on the rotation end side thereof,
In addition, it is also elastically absorbed by the left and right front mounts 18, 19 and the left rear mount 20. For this reason, the vibration accompanying the transmission of the roll displacement to the frame F and the passenger compartment can be reliably reduced.

As described above, in the power plant support structure of FIG. 1, the left and right front mounts 18 and 19 disposed at equal intervals b and b from the front-rear horizontal axis L2 passing through the center of gravity G of the power plant 14 Since the horizontal and vertical axis L2 and the roll axis L3 are supported by the left and right rear mounts 20 and 21 disposed in a plan view, the load shared by each of these mounts is divided into four parts and becomes relatively small. In addition, the durability of each mount of the power plant 14 suitable for lowering the floor can be easily secured. Moreover, since the rear mount is relatively far away from the roll axis L3, the roll rigidity is improved, the roll is easily regulated, and the vibration noise transmitted to the frame F and the vehicle interior can be reliably reduced.

Further, the left and right front side mounts 18, 1
9 is mounted on the side of the engine 15, one of the rear mounts 21 is mounted on the side of the transmission 17, and the other 20 is mounted on the upper part of the transmission 17, so that the connection structure of each mount can be simplified, and It becomes easy to configure the mount to be relatively far from the roll axis. Further, since one and the other of the rear mounts 20, 21 are arranged at equal intervals c, c from the horizontal axis L2 in the front-rear direction, the shared load can be surely equalized.

In the above description, the power plant 1
Left and right rear side mount 20 and 21 4 in plan view, it has been arranged across the longitudinal direction horizontal axis L2 and the roll axis L3, in addition to this, taking the even sandwich configuration crankshaft L 1 In this case, the left rear mount 20 can be further separated from the roll axis L3 to further improve the roll rigidity.

Further, the right rear mount 21 is mounted on the transmission 17 via the right rear arm 33. The rear mounts 20, 21 are mounted on the right and left ends of the right rear arm 33 mounted on the transmission 17, respectively. A mounting structure for connecting to the second cross member 13 may be adopted. In this case, there is an advantage that the mounting structure can be simplified and the roll rigidity can be easily adjusted by changing only the length of a single arm.

Further, in the support structure of the power plant shown in FIG. 1, the engine body 151 is inclined at an inclination angle θ.
This angle is appropriately changed. Further, although the vehicle has been described as a bus, the present invention can be applied to a large vehicle such as a truck, a medium-sized vehicle, and a small vehicle. Further, the above-described vehicle is a mid-ship type vehicle, but is also applicable to a front engine type vehicle. The present invention is applicable.

[0026]

As described above, according to the first aspect of the present invention, the power plant in which the engine and the transmission are integrally connected is disposed at equal intervals from the front-rear horizontal axis passing through the center of gravity of the power plant. The left and right front mounts are supported by left and right front mounts, and the left and right rear mounts are disposed so as to sandwich the horizontal axis and the roll axis in the front-rear direction in plan view.
And mount one of the rear mounts on the transmission.
On the side of the transmission and the other on top of the transmission
Since the mounts are mounted, the shared load of each of these mounts is divided into four parts, which are relatively small, and it is easy to ensure the durability of each mount. Moreover, the connection structure of the rear mount is simplified
One of the rear mounts is relatively far away from the roll axis.
It is easy to configure the
As a result, the roll regulation becomes easy, and the vibration noise transmitted to the frame and the passenger compartment side can be reliably reduced.

According to the second aspect of the invention, in particular, since one and the other of the rear mounts are arranged at equal intervals from the horizontal axis in the front-rear direction, the shared load can be equalized and the durability of each mount is ensured. Easier to do.

[Brief description of the drawings]

FIG. 1 is a cutaway plan view of a main part of a bus frame equipped with a power plant support structure as one embodiment of the present invention.

FIG. 2 is a cutaway side sectional view of a main part of a bus frame equipped with the power plant support structure of FIG. 1;

FIG. 3 is a schematic sectional view taken along line AA of FIG. 1;

FIG. 4 is a schematic sectional view taken along line BB of FIG. 1;

FIG. 5 is a schematic plan view of a conventional device.

FIG. 6 is a schematic side view of a conventional device. DESCRIPTION OF SYMBOLS 11 Side rail 12 1st cross member 13 2nd cross member 14 Power plant 15 Engine 151 Engine main body 16 Clutch 17 Transmission 18 Left front mount 19 Right front mount 20 Left rear mount 21 Right rear mount b Spacing θ Tilt angle F Frame G Center of gravity L1 Crankshaft L2 Front-back horizontal axis L3 Roll shaft X Body front-rear direction Y Vehicle width direction

Claims (2)

(57) [Claims] An engine and a transmission are integrally connected, and a power plant having a side surface of the engine inclined in a vehicle width direction is supported in a state in which a longitudinal direction of the power plant is directed in a vehicle longitudinal direction. A power plant support structure for supporting the power plant on a vehicle body base via a plurality of mounts, wherein left and right front mounts of the mount are positioned at equal intervals from a front-rear horizontal axis passing through the center of gravity of the power plant.
I, attached to the side of the engine, the rear mount of the left and right of the mount direction horizontal axis and the roll axis after front a position sandwiching in a plan view, one
One to the side of the transmission and the other to the
A support structure for a power plant, which is mounted on an upper part of a transmission . 2. The power plant support structure according to claim 1, wherein the left and right rear mounts are disposed at equal intervals from a horizontal axis in the front-rear direction.