JP4577649B2 - Power train - Google Patents

Description

  The present invention relates to a powertrain.

In recent years, attention has been paid to a power train in which an exhaust manifold is provided at the rear of a vehicle with respect to a horizontal engine (see Patent Document 1). This is because the exhaust purification device disposed near the exhaust manifold can be prevented from being cooled by the traveling wind, and the exhaust purification performance can be activated early.
JP 2004-36859 A

  However, in the case of the horizontal engine as described above, the layout of the exhaust gas purification device that purifies the exhaust gas from the engine becomes a problem. This is because the distance from the exhaust gas exhaust port to the dashboard in the engine is short. If an exhaust purification device directly under the engine is placed in the front-rear direction in the space between the engine and the dashboard, the length of the exhaust purification device will be shortened naturally, and sufficient exhaust purification performance will be realized. Can not do it.

  However, if the exhaust purification device is simply placed horizontally, there will be problems with its mounting stability and heat transmitted to other members.

  The present invention has been made to solve the above-described problems of the prior art, and an object thereof is to provide a power train in which an exhaust purification device is effectively arranged.

In order to achieve the above object, in the present invention,
In the engine room in the front part of the vehicle, an engine arranged horizontally so that the cylinder rows are arranged in parallel in the vehicle width direction;
A transaxle case including a transmission disposed on a lower side of the engine;
An exhaust manifold extending from the rear side surface of the upper part of the engine to the vehicle rear side;
An exhaust purification device disposed laterally from the downstream end of the exhaust manifold toward the transmission side;
A powertrain having
First fixing means for fixing the upstream end of the exhaust purification device to the engine;
Second fixing means for fixing a downstream end of the exhaust purification device to an upper portion of the transaxle case;
With
The second fixing means is disposed at a position on the upper part of the transaxle case and for receiving traveling wind from the engine side space.

  Thus, if the exhaust purification device is placed horizontally, a large exhaust purification device can be effectively arranged in the space between the horizontally placed engine and the dashboard. In addition, since the horizontal exhaust purification device is fixed at two locations, the upstream end and the downstream end, the mounting stability of the exhaust purification device can be improved. Further, since the second fixing means attached to the upper part of the transaxle case is disposed at a position for receiving the traveling wind from the engine side space, heat conduction from the exhaust purification device to the transaxle case can be suppressed. it can.

  The second fixing means includes a boss portion protruding upward from an upper surface of the transaxle case. As a result, the second fixing means can be more effectively disposed at a position for receiving the traveling wind from the engine side space, so that heat conduction from the exhaust purification device to the transaxle case can be further suppressed.

  The first fixing means includes a first bracket having a substantially L-shaped cross section, the second fixing means includes a second bracket having a substantially L-shaped cross section, and the first and second brackets include the exhaust gas purification. It is arranged at a position where the device is sandwiched. With this configuration, it is possible to improve the mounting stability of the exhaust purification device and to reliably absorb the thermal expansion in the vehicle width direction of the exhaust purification device with each bracket.

On the vehicle rear side of the transfer axle case, a rear drive transfer case disposed along the engine below the exhaust purification device, and a third fixing for fixing the transfer case to a side surface on the vehicle rear side of the engine Means, and the first fixing means is attached to the third fixing means . Thereby, the assembly | attachment property with respect to the engine of an exhaust gas purification device improves.

  It further includes a transfer case disposed on the rear side of the lower part of the engine, and the exhaust emission control device is arranged at the upper part of the transfer case so as to straddle the transfer case. As a result, the drive train layout can be utilized.

  ADVANTAGE OF THE INVENTION According to this invention, the power train which has arrange | positioned the exhaust gas purification apparatus effectively can be provided.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the components described in this embodiment are merely examples, and the scope of the present invention is not intended to be limited to them.

(Embodiment)
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic view of a power train 100 as an embodiment of the present invention when viewed from the vehicle rear side. For ease of explanation, a state in which various heat shield plates are removed is shown.

  As shown in FIG. 1, the powertrain 100 includes an engine 10, a transaxle case 20, an exhaust manifold 30, an exhaust purification device 40, and a transfer case 50. Among these, the engine 10 is arranged horizontally in the engine room at the front of the vehicle, and is designed so that the cylinder rows are juxtaposed in the vehicle width direction. The transaxle case 20 is a case that houses a torque converter, a transmission, and the like (not shown) disposed on the side of the vehicle below the engine 10. The exhaust manifold 30 includes exhaust pipes corresponding to the number of cylinders of the engine 10, and extends from the side of the upper part of the engine 10 toward the rear of the vehicle.

  An exhaust purification device 40 is connected to the downstream end of the exhaust manifold 30 and is disposed laterally toward the transmission side (left side in the figure). The exhaust purification device 40 incorporates a catalytic converter, and is connected to an exhaust pipe 42 that extends to the rear side of the vehicle by a spherical joint 41. The transfer case 50 is disposed on the rear side of the lower portion of the engine 10, accommodates a transmission shaft for driving a rear wheel (not shown), and is connected to a direction changing shaft 51 extending rearward. The exhaust purification device 40 is disposed above the transfer case 50 so as to straddle the transfer case 50. As a result, the exhaust pipe 42 is located on the transmission side (left side in the figure) with respect to the direction changing shaft 51.

  The powertrain 100 also includes a first bracket 61 as a first fixing means for fixing the upstream end of the exhaust purification device 40 to the engine 10, and the downstream end of the exhaust purification device 40 is fixed to the upper part of the transaxle case 20. And a second bracket 62 as second fixing means, and a third bracket 63 as third fixing means for fixing the transfer case 50 to the side surface of the engine 10 on the vehicle rear side.

  The second bracket 62 includes a boss portion 21 protruding upward from the upper surface of the transaxle case 20. The first bracket 61 and the second bracket 62 are made of sheet metal having a substantially L-shaped cross section, and are disposed so as to face a position where the exhaust purification device 40 is sandwiched. The first bracket 61 is fixed to a third bracket 63 attached to the rear side surface of the engine 10. Further, as a part of the exhaust purification device 40, a connection portion 43 for connecting to the first bracket 61 is provided, and the first bracket 61 is bolted to the connection portion 43, so that the exhaust purification device 40 is connected. I support it.

  FIG. 2 is a perspective view seen from above the left side when FIG. 1 is a front view of the powertrain 100. As shown in FIG. 2, the second bracket 62 is disposed on the upper portion of the transaxle case 20 at a position for receiving traveling wind from the engine side space in the vehicle width direction. For this reason, the boss part 21 protruding from the upper part of the transfer case is designed to be relatively high.

  FIG. 3 is a perspective view seen from above the right side when FIG. 1 is a front view of the powertrain 100. As shown in FIG. 3, the first bracket 61 is fixed to the connection portion 43 provided on the lower side of the exhaust purification device 40 and the third bracket 63 attached to the engine 10 with bolts. The third bracket 63 is fixed to both the engine 10 and the transfer case 50 and is configured to support the transfer case 50 as well.

  As described above, the exhaust purification device 40 is supported so as to be sandwiched from the left and right by the two brackets 61 and 62 both having an L-shaped cross section, and the mounting surfaces of the brackets 61 and 62 are opposed to each other. The expansion of the exhaust purification device 40 in the vehicle width direction can be appropriately absorbed by bending of the brackets 61 and 62.

  FIG. 4 is a two-side view showing the detailed shape of the first bracket 61. FIG. 4A is a front view of the first bracket 61, and FIG. 4B is a plan view. As shown in FIG. 4, two bolt holes 61 a and 61 b are provided on the bottom surface, and the first bracket 61 is fixed to the third bracket 63 by passing the bolts through the bolt holes 61 a and 61 b. Further, one bolt hole 61c is provided on the side surface, and the bolt is passed through the bolt hole 61c and attached to the connecting portion 43.

  FIG. 5 is a trihedral view showing the detailed shape of the second bracket 62. 5A is a front view, FIG. 5B is a plan view, and FIG. 5C is a right side view. When viewed from the front, it has a substantially trapezoidal outer shape and a wide bottom surface. Two bolt holes 62 a and 62 b are formed on the bottom surface, and can be bolted to the two boss portions 21 formed on the top surface of the transaxle case 20. Further, one bolt hole is formed on the side surface and is bolted to the exhaust purification device 40. Although it is substantially L-shaped as shown in the side view, it may have a surface perpendicular to the traveling wind in order to receive more traveling wind.

  FIG. 6 is a trihedral view showing the detailed shape of the third bracket 63. 6A is a front view, FIG. 6B is a left side view, and FIG. 6C is a right side view.

  As shown in FIG. 6A, the third bracket 63 is provided with three bolt holes 63a, 63b, 63c for bolting from the front to the side surface of the engine 10. The upper portion of the third bracket 63 projects toward the front, and two bolt holes 63d and 63e for bolting the first bracket 61 are provided in the projecting portion 63f. Further, as shown in the side view, two bolt holes 63h and 63i for connecting the third bracket 63 and the transfer case 50 are formed in the portion 63g protruding toward the front side in FIG. And are formed. Thereby, the transfer case 50 can be fixed to the engine 10.

  As described above, according to the present embodiment, since the exhaust purification device can be placed horizontally, a large exhaust purification device can be effectively arranged in the space between the horizontally installed engine and the dashboard. Moreover, since the horizontal exhaust purification device 40 is fixed at two locations, the upstream end and the downstream end, the mounting stability of the exhaust purification device 40 can be improved. Further, since the second bracket 62 attached to the upper part of the transaxle case 20 is disposed at a position for receiving the traveling wind from the engine side space, heat conduction from the exhaust purification device 40 to the transaxle case 20 is suppressed. be able to.

  Since the second bracket 62 includes the boss portion 21 that protrudes upward from the upper surface of the transaxle case 20, the second bracket 62 can be more effectively disposed at a position that receives traveling wind from the engine side space. Therefore, heat conduction from the exhaust purification device 40 to the transaxle case 20 can be further suppressed.

  Further, since the first bracket 61 and the second bracket 62 have a substantially L-shaped cross section and are disposed at positions where the exhaust purification device 40 is sandwiched, the attachment stability of the exhaust purification device 40 is improved and the exhaust purification is performed. The thermal expansion of the device 40 in the vehicle width direction can be reliably absorbed by each bracket.

  Since the 1st bracket 61 is attached to the 3rd bracket 63 attached to the back side of engine 10, the attachment nature to engine 10 of exhaust purification device 40 improves.

  The exhaust case 40 further includes a transfer case 50 disposed on the rear side of the lower portion of the engine 10, and the exhaust purification device 40 is disposed so as to straddle the transfer case 50 in the upper portion of the transfer case 50, so that the drive train layout is utilized Can do.

It is a figure which shows the structure of the power train as embodiment of this invention. It is a figure which shows the structure of the power train as embodiment of this invention. It is a figure which shows the structure of the power train as embodiment of this invention. It is a figure which shows the shape of the 1st bracket which concerns on embodiment of this invention. It is a figure which shows the shape of the 2nd bracket which concerns on embodiment of this invention. It is a figure which shows the shape of the 3rd bracket which concerns on embodiment of this invention.

Claims (5)

In the engine room in the front part of the vehicle, an engine arranged horizontally so that the cylinder rows are arranged in parallel in the vehicle width direction;
A transaxle case including a transmission disposed on a side of the vehicle below the engine;
An exhaust manifold extending from the vehicle rear side surface of the upper part of the engine to the vehicle rear side;
An exhaust purification device disposed laterally from the downstream end of the exhaust manifold toward the transmission side;
A powertrain having
First fixing means for fixing the upstream end of the exhaust purification device to the engine;
Second fixing means for fixing a downstream end of the exhaust purification device to an upper portion of the transaxle case;
With
The power train according to claim 1, wherein the second fixing means is disposed at a position on the upper part of the transaxle case and for receiving traveling wind from the engine lateral space in the vehicle width direction.   The power train according to claim 1, wherein the second fixing means includes a boss portion that protrudes upward from an upper surface of the transaxle case.   The first fixing means includes a first bracket having a substantially L-shaped cross section, the second fixing means includes a second bracket having a substantially L-shaped cross section, and the first and second brackets include the exhaust gas purification. The power train according to claim 1, wherein the power train is disposed at a position where the device is sandwiched. On the vehicle rear side of the transaxle case, a rear drive transfer case disposed along the engine below the exhaust purification device;
Third fixing means for fixing the transfer case to a side surface of the engine on the vehicle rear side;
Further comprising
4. The power train according to claim 1, wherein the first fixing means is attached to the third fixing means. A transfer case disposed on the rear side of the lower part of the engine;
The power train according to any one of claims 1 to 3 , wherein the exhaust gas purification device is disposed above the transfer case so as to straddle the transfer case.

Images