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Exhaust gas purification device

An exhaust gas purification device and exhaust gas technology, applied in the direction of exhaust devices, power devices, noise reduction devices, etc., can solve problems such as the difficulty of miniaturizing forklifts, and achieve the effect of suppressing temperature drop

Active Publication Date: 2020-08-14
TOYOTA IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the exhaust gas downstream side purification device and the noise reduction device (muffler) are arranged independently, there is a problem that it is difficult to secure a space for arranging the noise reduction device (muffler) on the rear side of the engine.
In addition, when the downstream purification device and the noise reduction device (muffler) are integrally arranged, there is a problem that it is difficult to reduce the size of the forklift due to the need to secure an arrangement space.

Method used

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  • Exhaust gas purification device
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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0085] (A) For example, it is also possible to use Figure 13 muffler 71 shown in place of Figure 10 The muffler 25 according to the above-mentioned embodiment is shown. Such as Figure 13 As shown, muffler 71 is with Figure 10 The muffler 25 according to the above-mentioned embodiment shown has almost the same structure. Among them, the different point mufflers 71 differ in that a substantially cylindrical connection pipe portion 72 is provided instead of the inflow cylinder portion 51 .

[0086] The connecting pipe portion 72 is connected to the upstream side exhaust pipe 23 to the inlet port 25A at the upstream side end, and is directed toward the downstream side ( Figure 13 middle left side) gradually expands in diameter obliquely upwards, and the main body portion 55A of the first partition wall portion 55 (refer to Figure 6 ) in contact with the radially inner base end portion, and the downstream end portion covers the entire surface of the upstream end portion ...

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Abstract

The exhaust gas purification device is provided with a pre-oxidation catalyst which is disposed in an exhaust gas passage located immediately after an engine mounted on a vehicle; and a muffler whichis provided around the pre-oxidation catalyst and which reduces the noise of exhaust gas generated by the engine and discharges the exhaust gas. The muffler is configured to have an inlet which is connected to an upstream exhaust pipe located immediately after the engine and into which exhaust gas flows; and an outlet which is connected to a downstream exhaust pipe and from which the exhaust gas flowing into the muffler from the inlet is discharged after passing through the pre-oxidation catalyst.

Description

technical field [0001] The present invention relates to an exhaust gas purification device for purifying exhaust gas discharged from an engine. Background technique [0002] An exhaust gas purification device that purifies exhaust gas from a diesel engine is provided with a particulate matter removal filter (generally referred to as a Diesel Particulate Filter, hereinafter referred to as "DPF"), nitrogen oxides (NO x ), carbon monoxide (CO), hydrocarbons (HC), etc. to oxidize and remove oxidation catalysts (DOC: Diesel Oxidation Catalyst) and other purification treatment components. [0003] For example, in the exhaust gas purification device described in the following patent document 1, a structure is disclosed in which a relatively small pre-stage oxidation catalyst is arranged on the upstream side of an exhaust pipe that discharges exhaust gas from a diesel engine to the outside, and The downstream side of the stage oxidation catalyst is equipped with NO x Absorption c...

Claims

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Application Information

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IPC IPC(8): F01N3/24B60K13/04F01N1/02F01N3/022
CPCB60K13/04F01N3/2839F01N13/141F01N3/2885F01N1/08F01N3/28F01N2230/04F01N3/021F01N3/103F01N2590/08F01N1/083F01N1/026Y02T10/12F01N3/106F01N3/2803F01N13/0097F01N13/1805F01N1/02F01N3/022F01N1/003F01N1/089F01N2490/04F01N3/24
Inventor 今野安津志
Owner TOYOTA IND CORP