Exhaust system for motorcycles and the like

Abstract

 An exhaust system (1), particularly for motorcycles and the like, is characterized in that it comprises a catalytic element (2) removably arranged between an exhaust manifold (3) and a silencer (4).

Description

BACKGROUND OF THE INVENTION

[0001] The present invention relates to an exhausting system construction, specifically designed for motorcycles and the like.

[0002] As is known, motorcycle exhausting systems conventionally comprise one or more end-pieces comprising the silencer device, and being associated with a manifold coupled to the engine exhausting means.

[0003] With the introduction on the market of catalytic exhausting systems, motorcycles including box-like catalytic mufflers, of a type like that used in cars, have been also constructed.

[0004] However, the most part of existing motorcycles and a lot of new motorcycle models, comprise conventional cylindric end-pieces, arranged at the sides of the motorcycle rear wheel.

[0005] Cylindric catalytic end-pieces are very expensive and, likewise to existing catalytic systems, they must be periodically replaced, as the catalyzer effect has been exhausted.

[0006] Another drawback is that in a case of damaging, such as due to a fall, the overall catalytic end-piece must be replaced, with a consequent very high cost.

SUMMARY OF THE INVENTION

[0007] Accordingly, the aim of the present invention is to provide such an exhausting system construction to be used in motorcycles and the like, overcoming the above mentioned drawbacks of the prior art.

[0008] Within the scope of the above mentioned aim, a main object of the invention is to provide such an exhausting system construction which can be used for a very broad range of exhausting systems, included those which are already existing on the market.

[0009] Another object of the present invention is to provide such an exhausting system construction which allows to restore the catalytic system, with a low cost.

[0010] According to one aspect of the present invention, the above mentioned aim and objects, as well as yet other objects, which will become more apparent hereinafter, are achieved by an exhausting system construction, particularly for motorcycles and the like, characterized in that it comprises a catalytic element which can be removably arranged between an exhausting manifold and a silencer device.

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Further characteristics and advantages of the present invention will become more apparent hereinafter from the following detailed disclosure of a preferred, though not exclusive, embodiment of the invention, which is illustrated, by way of an indicative, but not limitative example, in the accompanying drawings, where:

Figure 1 is a side elevation view, as longitudinally cross-sectioned, showing an exhausting system;

Figure 2 is a longitudinal cross-sectional view, analogous to figure 1, but on an enlarged scale, showing in a more detailed manner the catalytic device according to the invention;

Figure 3 is a further longitudinal cross-sectioned side elevation view showing an exhausting system according to a further aspect of the invention;

Figure 4 is yet another longitudinal cross-sectioned view, on an enlarged scale, showing in a more detailed manner the catalytic device according to the invention;

Figure 5 is yet another longitudinal cross-sectioned side elevation view showing an exhausting system according to a further aspect of the present invention; and

Figure 6 is a further longitudinal cross-sectional view, on an enlarged scale, showing in a detailed manner the catalytic device of the exhausting system according to the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] with reference to the number references of the above mentioned figures, the exhausting system construction according to the present invention, which has been generally indicated by the reference number 1, comprises, as main components thereof, a catalytic element 2, which can be removably arranged between an exhausting manifold 3 and a silencer device 4.

[0013] More specifically, the catalytic element 2 comprises a substantially cylindric body, including a plurality of concentric chambers, and having walls coated by a catalyzer, of a per-se known type.

[0014] In particular, the catalytic element 2 can be arranged at a cylindric end portion 5 of an exhausting manifold 3, which can be in turn engaged in an inlet bottom element 6 of the silencer device 4.

[0015] Said silencer device 4 may be of any per se known type, and comprises an outer casing 7, coupled, at an end portion thereof, to the inlet bottom element 6 and, at the other end portion thereof, to an outlet bottom element 8.

[0016] Said inlet 6 and outlet 8 bottom elements operate as a support for a core element 10 comprising a perforated tube, ending with an unperforated outlet portion 11.

[0017] The core element 10 is locked by a locking rivet 12, coupling the outlet bottom 8 to the outlet portion 11 of said core element 10.

[0018] As shown, between said core element 10 and outer casing 7, a sound absorbing material 9, such as a glass wool material, is arranged.

[0019] The silencer device 4 is locked on the manifold 3 by locking means comprising, in this embodiment, pulling spring elements 13, having end portions attached to suitable attachment means 14 which are respectively welded on the manifold 3 and inlet bottom element 6 of the silencer device 4.

[0020] Figures 3 and 4 show an exhausting system construction 101, fully analogous to the exhausting system construction 1 shown in figures 1 and 2, but including different locking means for locking the silencer device 4 on the manifold 3.

[0021] Said locking means, in particular, comprise, in this embodiment, screws or rivets 113 designed for clamping therebetween bracket elements 114 respectively associated with the manifold 3 and the inlet bottom element 6 of the silencer device 4.

[0022] Figures 5 and 6 show an exhausting system construction 201, fully analogous to the construction 1 and 101 shown in the preceding figures, but including a probe element 215 which is an useful element for the operation of the electronic injection system.

[0023] It has been found that the invention fully achieves the intended aim and objects.

[0024] In fact, the invention provides a motorcycle exhausting system construction allowing to fit exhausting system with either one or more silenced end-pieces, independent from the catalyzer device.

[0025] Moreover, the modular structure of the subject exhausting system construction provides a lot of functional advantages.

[0026] For example, it is possible to replace the catalyzer element without replacing the overall exhausting system, as the catalyzing effect is expired.

[0027] Thus, such a periodic operation, which is absolutely necessary to maintain the exhausting system in an efficient operating condition, mainly from an emission standpoint, is carried out in a very unexpensive manner.

[0028] Another advantage is that, in a case of a damaging of the end-piece, for example occurring in a road accident, said end-piece, which does not comprise the catalyzer proper, can be replaced in a manner which is much more unexpensive than the replacement of a conventional catalyzed exhausting end-piece.

[0029] In practicing the invention, the used materials, as well as the contingent size and shapes, can be any, depending on requirements.

Claims

1. An exhausting system construction, for motorcycles and the like, characterized in that said exhausting system construction comprises a catalytic element which can be removably arranged between an exhausting manifold and a silencer device.

2. An exhausting system construction, according to claim 1, characterized in that said catalytic element comprises a substantially cylindric body, including a plurality of concentric chambers having chamber walls coated by a catalyzer.

3. An exhausting system construction, according to claim 1 or 2, characterized in that said catalytic element is adapted to be arranged in a cylindric end portion of the exhausting manifold, which can be in turn engaged in an inlet bottom element of the silencer device.

4. An exhausting system construction, according to one or more of the preceding claims, characterized in that said silencer device comprises an outer casing having an end portion which can be coupled to the inlet bottom element and having an opposite portion which can be coupled to an outlet bottom element.

5. An exhausting system construction, according to one or more of the preceding claims, characterized in that said inlet and outlet bottom elements operate as a support for a core element comprising a perforated tube, ending with an unperforated outlet portion.

6. An exhausting system construction, according to one or more of the preceding claims, characterized in that said core element is locked by a locking rivet coupling said outlet bottom element to an outlet portion of said core element.

7. An exhausting system construction, according to one or more of the preceding claims, characterized in that between said core element and outer casing a sound absorbing material is arranged.

8. An exhausting system construction, according to one or more of the preceding claims, characterized in that said sound absorbing material, arranged between said core element and outer casing, comprises a glass wool material.

9. An exhausting system construction, according to one or more of the preceding claims, characterized in that said silencer device is locked on said exhausting manifold by locking means comprising pulling spring elements having end portions thereof clamped to welded attachment means, respectively welded on said exhausting manifold and said inlet bottom element of said silencer device.

10. An exhausting system construction, according to one or more of the preceding claims, characterized in that said silencer device is locked on said exhausting manifold by locking means comprising locking screws or rivets, adapted to clamp therebetween bracket elements respectively associated with said exhausting manifold and inlet bottom element of said silencer device.

11. An exhausting system construction, according to one or more of the preceding claims, characterized in that said exhausting system construction comprises a probe element for operating an electronic injection system.

Drawing