GB2523387A

GB2523387A - Engine-mountable emissions cleaning module

Info

Publication number: GB2523387A
Application number: GB1403218.9A
Authority: GB
Inventors: Paul Andrew Davies; Vicki Lovell; Stephen J Marshall; Keith Standbrook; Mark Freeman
Original assignee: Perkins Engines Co Ltd
Current assignee: Perkins Engines Co Ltd
Priority date: 2014-02-24
Filing date: 2014-02-24
Publication date: 2015-08-26
Anticipated expiration: 2034-02-24
Also published as: GB2523387B; CN204511578U; GB201403218D0

Abstract

An engine-mountable emissions cleaning module has a mass damper assembly 3. The mass damper assembly 3 comprises a bracket 17 adapted to secure the mass damper assembly to the emissions cleaning module, a damping body 19, and a retaining means 21 for coupling the damping body to the bracket. The retaining means is configured to allow the damping body to oscillate with six degrees of freedom. The damping body and the retaining means are constructed and arranged to provide the damping body with a resonant frequency substantially the same as a resonant frequency of the emissions cleaning module, but preferably oscillating out of phase therewith. The damping body is adapted, with the retaining means, to dampen an oscillatory motion of the emissions cleaning module. The retaining means may comprise an elastomeric material, such as rubber. The damping body may comprise one or more mass elements, and be variable by adding or removing one or more mass elements.

Description

Engine-mountable emissions cleaning module

Technical field

The present disclosure relates to an engine-mountable emissions cleaning module. In particular, the present disclosure relates to an engine-mountable emissions cleaning module having a mass damper assembly.

Background

A vehicle typically has many component parts that can vibrate. For example, engine operation can cause parts that are connected to the engine to vibrate. Such vibration can cause a stress, strain or wear on the parts, particularly at connection points where parts connect to one another. The vibration can also result in noise, which is undesirable because it can cause discomfort to a vehicle operator.

Emissions cleaning modules, such as aftertreatment systems, may typically be mounted upon an engine in an engine bay of a vehicle. Excessive vibrations of the emissions cleaning module may be caused by operation of the engine, the aftertreatment system itself and/or other component parts of the vehicle (i.e. deemed "excessive" due to the stress or strain caused by the vibration acting on a connection point) . The amount of vibration is variable according to many factors, including the size and weight or the emissions cleaning module, the positioning of the emissions cleaning module with respect to the engine and also the manner of connection of the emissions cleaning module to the engine.

Summary

According to an aspect of the present disclosure, there is provided an engine-mountable emissions cleaning module having a mass damper assembly, the mass damper assembly comprising: a bracket adapted to secure the mass damper assembly to the emissions cleaning module; a damping body; and a retaining means for coupling the damping body to the bracket, the retaining means configured to allow the damping body to oscillate with six degrees of freedom, wherein the damping body and the retaining means are constructed and arranged to provide the damping body with a resonant freguency substantially the same as a resonant freguency of the emissions cleaning module when mounted on an engine, the damping body being adapted, with the retaining means, to dampen an oscillatory motion of the emissions cleaning module.

Brief description of the drawings

Aspects of the present disclosure will now be described, by way of example only, with reference to the following figures, in which: Figure 1 is a perspective view of an emissions cleaning module according to an exemplary embodiment of the present

disclosure;

Figure 2 is a side view of the emissions cleaning module of Figure 1; Figure 3 is a plan view of the emissions cleaning module of Figures 1 and 2; Figure 4 is a perspective view of a mass damper assembly according to an exemplary embodiment of the present

disclosure;

Figure 5 is a cross-sectional view of the mass danper assembly of Figure 4; Figure 6 is an enlarged view of a damping body of the mass damper assembly of Figure 5; Figure 7 is a perspective view of an emissions cleaning module according to another exemplary embodiment of the

present disclosure; and

Figure 8 is a perspective view of an emissions cleaning module according to another exemplary embodiment of the

present disclosure.

Detailed description

Embodiments of the present disclosure relate to an engine-mountable emissions cleaning module having a mass damper assembly. Whilst detailed embodiments are described below, it will be understood that these embodiments are provided to exemplify situations for which the present disclosure may be embodied and are thus not intended to be limiting.

Figure 1 is a perspective view of an engine-mountable emissions cleaning module 1 according to an exempary embodiment of the present disclosure. The emissions cleaning module 1 comprises a mass damper assembly 3. Tn this example, the emissions cleaning module 1 is shown as being mounted on an upper surface of an internal combustion engine 5, such as that provided in an off-highway or on-highway vehicle (not shown) . More particularly, the emissions cleaning module 1 is mounted to a part of the engine 5 that would ordinarily be housed in an engine bay (not shown) of the vehicle. The emissions cleaning module 1 may be an aftertreatment unit for treating emissions from the engine (e.g. by filtering particulate matter and reducing nitrogen oxides emissions) For example, the aftertreatment unit may comprise one or more of a Diesel Particulate Filter (DPF) , Selective Catalyst Reduction (SCR) module and Diesel Oxidation Catalyst (DCC) The emissions cleaning module 1 is substantially cylindrical in shape, having a front face 7, a rear face 9 and a side wall 11, which side wall 11 extends between the front face 7 and the rear faoe 9. The emissions oleaning module 1 has a longitudinal axis that lies substantially along a horizontal plane when the emissions cleaning module 1 is provided on the engine 5.

The emissions cleaning module 1 is mounted to the engine 5 using spaced mounting straps 13-1, 13-2, which are secured to the engine 5 and extend around the periphery of the cylindrical emissions cleaning module 1 to retain the emissions cleaning module 1 in position above the engine 5.

The emissions cleaning module 1 also comprises a flange 15 that extends around a periphery of the emissions cleaning module 1 as defined by the side wall 11. The flange 15 extends radially outwards from the emissions cleaning module 1.

The mass damper assembly 3 comprises a bracket 17, a damping body 19 and a retaining means 21 for coupling the damping body 19 to the bracket 17. The bracket 17 is adapted to secure the mass damper assembly 3 to the emissions cleaning module 1, which can be done, for example, using fixing means 23 (e.g. screws, nuts, bolts, and so forth) that secure the bracket 17 to the flange 15. The retaining means 21 can be formed from any device or material suitable for coupling the damping body 19 to the bracket 17 and that can allow oscillation of the damping body 19 with six degrees of freedom with respect to the bracket 17. In this example, the retaining means 21 is formed from an elastomeric material that is provided between the bracket 17 and the damping body 19 and acts as a mounting for the damping body 19.

The mass damper assembly 3 is positioned with respect to the emissions cleaning module 1 at a location that maximises a damping of vibrations from the emissions cleaning module 1.

In this example, the mass damper assembly 3 is located towards the front face 7 of the emissions cleaning module 1.

Figure 2 is a side view of the emissions cleaning module 1 from which the front face 7 can be seen. As shown in Figure 2, the mass damper assembly 3 is arranged so that the damping body 19 is offset from a central vertical axis (not shown) of the emissions cleaning module 1. In the particular engine configuration of Figure 2, this positioning of the damping body 19 is determined to have a greater damping capability compared with if the damping body 19 were to be disposed closer towards the central vertical axis.

Figure 3 is a plan view of a portion of the emissions cleaning module 1, showing the offset position of the damping body 19 with respect to the emissions cleaning module 1.

Figures 4 to 6 show the mass damper assembly 3 in more detail.

Figure 4 is a perspective view of the mass damper assembly 3. The damping body 19 is a cylindrical shaped mass element having an aperture. As such, the damping body 19 has an annular cross-section when viewed from a plan view. The bracket 17 is shaped so as to substantially conform to at least part of the outside of the emissions cleaning module 1. More particularly, the bracket 17 comprises a curved portion 25 which is adapted to fit around part of the side wall 11 of the emissions cleaning module 1, and a mounting portion 27, which is fitted to an end of the bracket 17 disposed away from the central vertical axis of the emissions cleaning module 1 (which axis is described with reference to Figure 1) . A rod 29 protrudes from the mounting portion 27 in a direction parallel to the central vertical axis. The damping body 19 is located around the rod 29 of the mounting portion 27 of the bracket 7 and is retained around the rod 29 by the retaining means 21 (not shown) Figure 5 is a cross-sectional view of the mass danper assembly shown in Figure 4. As shown in this figure, the retaining means 21 can be formed by one or more of the rod 29, the damping body 19 and an elastomeric mount 31. The elastomeric mount 31 is annular and is positioned so that the rod 29 protrudes through an aperture defined by the annular shape of the elastomeric mount 31. An upper end of the rod 29 comprises a first stop portion 33, which acts to prevent the elastomeric mount 31 from moving past the upper end of the rod 29. A second stop portion 35 is provided around a lower end of the rod 29, which acts with the first stop portion 33 to clamp the elastomeric mount 31 to the rod 29 and prevent the elastomeric mount 31 from sliding along the rod 29. The elastomeric mount 31 is also retained to the damping body 19 so that the damping body 19 can be maintained in a location around the rod 29.

Figure 6 is an enlarged cross-sectional view showing a portion of the mass damper assembly 3 of Figure 5 in more detail. The damping body 19 has an inner wall 37 that is concentric with the rod 29. The elastomeric mount 31 engages with the inner wall 37 in a manner so that the damping body 19 is retained in a location around the rod 29.

In particular, the inner wall 37 comprises a stepped portion 39, which extends along a periphery of the inner wall 37.

The elastomeric mount 31 engages with this stepped portion 39 of the inner wall 37.

The retaining means 21 of Figures 1 to 6 is arranged so that the damping body 19 is permitted to oscillate with respect to the bracket 17 with six degrees of freedom (i.e. forward/backwards, up/down, left/right, pitch, yaw and roll) -For example, the elastomeric mount 31 may have a predetermined stiffness, k, to allow a predetermined amount of oscillation of the damping body 19.

Additionally, the damping body 19 is defined with a predetermined weight/mass, size and shape so as to have a specific resonant freguency.

More particularly, the characteristics of the elastomeric mount 31 and the damping body 19 may be selected so as to provide the mass damper assembly with a particular damping capability for the emissions cleaning module 1 when mounted to an engine 5. For example, the characteristics of the elastomeric mount 31 and the damping body 19 may be selected to provide a resonant freguency substantially the same as a resonant freguency of the emissions cleaning module 1 when mounted to the engine 5.

Figure 7 is a perspective view of an emissions cleaning module 101 according to another exemplary embodiment of the present disclosure. The emissions cleaning module 101 is the same as that described with reference to Figures 1 to 3.

A mass damper assembly 103 is provided having a bracket 117 that is the same as that described with reference to Figures 1 to 3. A damping body 119 is provided and is coupled to the bracket 117 via a retaining means 121. In thIs example, the damping body 119 is formed from a plurality of mass elements 141. Each mass element 141 is removably coupled to the bracket 117 such that the mass/weight of the damping body 119 can be readily adjusted by either removing or adding a mass element 141. In this manner, the mass elements 141 can be selectively stacked so as to provide the adjustable mass of the damping body 119. The retaining means 121 can accordingly be manipulated to allow mass elements 141 to be added or removed. In this exanple, the mass elements 141 have a circular disc shape, but it will be appreciated that many other shapes are possible, such as a disc having a square cross section, and so forth.

Figure 8 is a perspective view of an emissions cleaning module 201 according to another exemplary embodiment of the present disclosure. The emissions cleaning module 201 is the same as that described with reference to Figures 1 to 3. In this example, damping of the emissions cleaning module 201 is provided by a bracket 217, which acts as a damping body 219. The bracket 217 is mounted to a flange 215 of the emissions cleaning module 201 via retaining means 221-1, 221-2, which retaining means 221-1, 221-2 is configured to allow an oscillatory motion of the bracket 217 with respect to the emissions cleaning module 201.

The emissions cleaning modules 1, 101, 201 described above may be implemented in a machine, for example a heavy equipment vehicle, such as a backhoe loader, which may comprise an internal combustion engine, such as a diesel engine. Whilst embodiments of the present disclosure have been described with reference to a vehicle engine, it will be appreciated that, in other exemplary embodiments, the engine may form a component part of a non-vehicular system.

For example, the engine may form a part of a power generation set (so called "gensets") Exemplary embodiments of the present disclosure described herein with reference to Figures 1 to 6 provide a -1_O -substantially cylindrical shaped damping body. In other exemplary embodiments, the damping body may have a different shape, such as a cuboid shape.

Industrial applicability

The emissions cleaning modules 1, 101, 201 described herein may form part of a diesel engine aftertreatmerit system, and in particular, an engine mounted aftertreatment (EMAT) system. As such, the emissions cleaning module 1, 101, 201 may comprise one or more of a Diesel Particular Filter (DPF) module, a Diesel Oxidation Catalyst (DCC) module and a Selective Catalytic Reduction (5CR) module.

The emissions cleaning modules 1, 101, 201 operate so that machine systems which employ such emissions cleaning modules 1, 101, 201 can comply with various emissions standards.

Such emissions standards dictate set limits for the amount of pollutants that can be released into the environment.

In operation, the emissions cleaning module 1, 101, 201 may have a tendency to vibrate. Alternatively or additionally, such vibrations may be caused, for example, by the engine upon which the emissions cleaning module 1, 101, 201 is mounted. Alternatively or additionally, the vibrations may come from the relevant machine system.

The mass damper assembly 3, 103, 203 acts to provide a damping of the vibrations of the emissions cleaning module 1, 101, 201. More particularly, the mass damper assembly 3, 103, 203 is constructed and arranged in the manner described above with reference to Figures 1 to 8, in order that it may -1_i -oscillate to counter or absorb any vibrations of the emissions cleaning module 1, 101, 201.

As mentioned above with reference to Figures 1 to 8, the damping body 19, 119, 219 is defined with a predetermined weight/mass, size and shape so as to at least partially define the oscillatory motion. In particular, the mass of the damping body 19, 119, 219 should be similar to the mass of the emissions cleaning module 1, 101, 201 that is participating in the vibrational mode (known as the modal mass) -As an example, the emissions cleaning module 1, 101, 201 may have a resonant freguency of 100Hz and a weight of 15kg. In this instance, modelling and simulation carried out on the arrangement of the emissions cleaning nodule 1, 101, 201 with the mass damper assembly 3, 103, 203 showed that a damping body 19, 119, 219 of 10% of the weight of the emissions cleaning module 1, 101, 201 (i.e. 1.5kg) and a elastomeric mount 31 stiffness of 592,179 N/m woud result in a resonant freguency of 100Hz. The elastomeric mount 31, in this example, is made from rubber, however it will be appreciated that various other materials may be used instead of or in addition to rubber so as to provide the elastomeric mount 31 with the appropriate stiffness. The mass damper assembly 3, 103, 203 therefore acts to split the vibrational mode into two separate modes. The elastomeric mount 31 behaves as a spring element, which dissipates mechanical energy as heat and thereby reduces the amplitude of the vibration of the emissions cleaning module 1, 101, 201.

In operation, as the emissions cleaning module 1, 101, 201 moves in a first direction, the damping body 19, 119, 219 is caused to move in a second direction that opposes the first -12 -direction so as to at least partially counteract the movement of the emissions cleaning module 1, 101, 201. The damping body 19, 119, 219 therefore vibrates with a freguency that is substantially out-of-phase with a freguency of the vibrating emissions cleaning module 1, 101, 201.

The damping of the vibrations of the emissions cleaning module 1, 101, 201 using the mass damper assembly 3, 103, 203 can therefore reduce any stress, strain or wear on the emissions cleaning module 1, 101, 201 as well as any noise, which could result from such vibrations when no damping is provided.

The cylindrical shape of the damping body 19 of FIgures 1 to 6 means that the centre of gravity can be located at a centre-point of the damping body 19, which in turn allows a better predictability of the vibrational movement of the system of the emissions cleaning module 1 with the mass damper assembly 3.

Claims

-1_3 -Claims 1. An engine-mountable emissions cleaning module having a mass damper assembly, the mass damper assembly conprising: a bracket adapted tc secure the mass damper assembly to the emissions cleaning module; a damping body; and a retaining means for coupling the damping body to the bracket, the retaining means configured to allow the damping body to oscillate with six degrees of freedom, wherein the damping body and the retaining means are constructed and arranged to provide the damping body with a resonant frequency substantially the same as a resonant frequency of the emissions cleaning module when mounted on an engine, the damping body being adapted, with the retaining means, to dampen an oscillatory motion of the emissions cleaning module.
2. An emissions cleaning module according to claim 1, wherein the retaining means comprises an elastomeric mounting.
3. An emissions cleaning module according to claim 1 or 2, wherein the retaining means comprises rubber.
4. An emissions cleaning module according to any preceding claim, wherein the damping body has an annular cross-section which defines an aperture therein.
5. An emissions cleaning module according to claim 4, wherein the bracket comprises a rod arranged within the aperture of the damping body.

-1_4 -
6. An emissions cleaning module according to claim 5, wherein the aperture is defined by an inner wall of the damping body, which inner wall has a stepped profile.
7. An emissions cleaning module according to claim 6, wherein the retaining means is disposed between a portion of the rod and an area of the inner wall corresponding to the stepped profile.
8. An emissions cleaning module according to any of claims 1 to 3, wherein the retaining means comprises one or more fixings adapted to secure the damping body to the bracket.
9. An emissions cleaning module according to claim 8, wherein the damping body comprises a shape and dinensions so as to conform to a shape and dimensions of the bracket.
10. An emissions cleaning module according to any preceding claim, wherein the bracket is constructed and arranged to conform to an outer surface of the emissions cleaning module.
11. An emissions cleaning module according to any preceding claim, wherein the damping body is constructed to have a mass and dimensions, which combined with a stiffness of the retaining means, provides the resonant freguency.
12. An emissions cleaning module according to claim 11, wherein the resonant freguency is approximately 100 Hz.

-1_5 -
13. An emissions cleaning module according to any preceding claim, wherein the mass damper assembly is adapted to provide a critioal damping for the emissions oleanirig module.
14. An emissions cleaning module according to any preceding claim, wherein the damping body is adapted to move, with the retaining means, out of phase with the oscillatory motion of the emissions cleaning module.
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