JPH0738617U - Exhaust pipe routing structure for automobiles - Google Patents

Abstract

(57) [Abstract] [Purpose] In an automobile in which an exhaust pipe is installed below the engine and at least the front wheels are driven, the space occupied by the exhaust pipe in the engine room is reduced and the joint boot of the front axle shaft is reduced. Avoid heat damage to the exhaust pipe. [Structure] An exhaust pipe 9 that passes through the underside of a cylinder block of one of the left and right banks of the engine 2 and is routed rearward through the underside of the front differential 5 near the lower rear portion of the engine is connected to the front differential 5. A structure in which it rises upward through a space between the steering gear box 10 on the rear side, crosses over the steering gear box 10 and descends downward at the rear of the steering gear box 10, and is then routed backward along the lower side of the vehicle body floor panel. And

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an exhaust pipe routing structure for an automobile.

[0002]

[Prior art]

 In an automobile, the exhaust gas of the engine mounted in the front part of the engine compartment passes through the lower side of the engine, straddles the upper side of the steering gear box in the rear part, and is arranged along the lower side of the floor panel behind it. The pipe is normally guided to the rear of the vehicle body and discharged from the rear of the vehicle body through the muffler to the rear (for example, see Japanese Utility Model Laid-Open No. 3-73612).

For example, in a horizontally opposed engine front-wheel drive vehicle, conventionally, as shown in FIG. 2, exhaust pipes a ', a'outgoing from the left and right banks of the engine are provided on either the left or right bank, for example, In front of the cylinder head on the left bank side, it merges with one exhaust pipe a, and the exhaust pipe a is routed rearward through below the cylinder head on the left bank side, and in the rear part of the engine, a steering gear box b and a front axle are provided. The configuration is such that the upper part of the shaft c is largely bypassed and the pipe is piped rearward. In FIG. 2, d is a catalyst device for purifying exhaust gas.

[0004]

[Problems to be solved by the device]

 As shown in FIG. 2, in the conventional configuration in which the exhaust pipe a is largely bypassed above the steering gear box b and the front axle shaft c and is piped rearward, the exhaust pipe a has a large radius of curvature at the bypass portion. Although it is easy to bend, the space occupied by the exhaust pipe in the narrow engine room becomes large, which poses a problem that it hinders the attachment of auxiliary equipment and deteriorates maintainability. Since the exhaust pipe a is located in the vicinity of the joint boot c'of the front axle shaft c, there is a problem that special measures must be taken to prevent heat damage to the joint boot c '.

The present invention aims to address the above-mentioned conventional problems.

[0006]

[Means for Solving the Problems]

 The present invention has an exhaust pipe arranged below the engine, and in an automobile in which at least the front wheels are driven, the lower part of the front differential installed near the lower rear part of the engine passes under the cylinder block of either the left or right bank of the engine. The exhaust pipe routed backwards through the side rises upward between the front differential and the steering gear box behind it, rises upward, crosses over the steering gear box, and falls downward behind it. The structure is characterized in that it is piped backward from there along the underside of the vehicle body floor panel.

[0007]

[Action]

 As described above, the exhaust pipe is laid out so as to straddle only the steering gear box, so that the conventional exhaust pipe laid structure that is laid around both the steering gear box and the front axle shaft In comparison, the space occupied by the exhaust pipe in the engine room is quite small, and the conventional problems such as the exhaust pipe hindering the attachment of auxiliary equipment and degrading maintainability are solved, and the exhaust gas is exhausted. The passage of the pipe under the front differential away from the joint boot of the front axle shaft eliminates the risk of heat damage to the joint boot and eliminates any need for heat damage measures.

[0008]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIG.

In FIG. 1, reference numeral 1 is a power unit including an engine (horizontally opposed engine) 2, a clutch 3 and a transmission (including a center differential 4 ′) 4. The front differential 5 is disposed in the lower front part of the clutch 3 (rear part of the engine), and the left and right output shafts of the front differential 5 are connected to the left and right front axle shafts 6, 6 via constant velocity joints 7, 7. And is configured to drive the left and right front wheels 8, 8.

The left and right exhaust pipes 9a, 9a that come out of the left and right banks of the engine 2 merge into one exhaust pipe 9 at the lower front part of the engine 1, and the exhaust pipe 9 can be located in either the left or right bank, for example For example, it is routed rearward through the lower part of the cylinder block on the left bank side, passes under the front differential 5 and rises upward between the front differential 5 and the steering gear box 10 behind it, It straddles the upper side of the steering gear box 10 and descends downward at the rear of the steering gear box 10, and is pulled rearward along the lower portion of a vehicle body floor panel (not shown). Reference numeral 9'denotes an exhaust gas purifying catalyst device, and 11 denotes an engine mount cross member.

As described above, the exhaust pipe 9 is raised by utilizing the dead space between the front differential 5 and the steering gear box 10, and the exhaust pipe 9 straddles only the steering gear box 10. As a result, compared to the conventional configuration in which the exhaust pipe greatly straddles both the steering gear box and the front axle shaft, the space occupied by the exhaust pipe in the engine room is smaller, and the auxiliary equipment Conventional problems such as obstacles to mounting and deterioration of maintainability are solved, and the exhaust pipe 9 passes through the lower portion near the center of the engine 2 as compared with the conventional one, and passes through the lower side of the front differential 5 toward the rear. Since the exhaust pipe 9 is located far from the boot 7'of the constant velocity joint 7 of the front axle shaft 6, the exhaust pipe 9 is located far from the boot 7 '. There is no danger of the boot 7'being damaged by heat, and no measure for heat damage is required.

[0012]

[Effect of device]

 As described above, according to the present invention, it is possible to reduce the space occupied by the exhaust pipe in a narrow engine room with an extremely simple structure, and the exhaust pipe can prevent the attachment of accessories. It is possible to solve conventional problems such as deterioration and maintainability, and eliminate the risk of the front axle shaft joint boots being damaged by heat from the exhaust pipe. Is completely unnecessary and can bring about a great effect in practice.

[Brief description of drawings]

1 shows an embodiment of the present invention, (A) is a side view and (B) is a plan view.

FIG. 2 shows an example of a conventional structure, (A) is a side view,
(B) is a plan view.

[Explanation of symbols]

 1 Power Unit 2 Engine 3 Clutch 4 Transmission 5 Front Diff 6 Front Axle Shaft 8 Front Wheel 9 Exhaust Pipe 10 Steering Gear Box 11 Cross Member

Claims (1)

[Scope of utility model registration request] 1. In a vehicle in which an exhaust pipe is arranged below an engine and at least front wheels are driven, a front differential installed in the vicinity of a lower rear portion of the engine passes under a cylinder block of either one of the left and right banks of the engine. An exhaust pipe routed rearward through the lower side rises upward between the front differential and a steering gear box behind the front diff, and descends downward behind the steering gear box across the steering gear box, An exhaust pipe routing structure for automobiles, characterized in that the structure is such that it is piped rearward along the lower side of the vehicle body floor panel.