JPS6237935Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an exhaust purification device for motorcycles, and in particular to a check valve device used in an exhaust purification device. The present invention relates to a device that introduces atmospheric air into a passageway and oxidizes and removes atmospheric pollutants in exhaust gas.

[Prior Art] Conventionally, there has been a strong demand for miniaturization of secondary air used in exhaust systems and check valves for introduction, and this demand is particularly strong for motorcycles with small mounting spaces. In addition, since a large number of air pumps are used in a multi-cylinder engine, their installation and piping for secondary air passages are complicated, and this problem is especially serious in motorcycles.

[Purpose and outline of the invention]

The purpose of this invention is to obtain a check valve that is small and inexpensive and does not have the above-mentioned problems. The check valve 18 is connected to a secondary air passage 16 equipped with
The seat plate 27 is divided into sections in the width direction.
and a valve body 26, and divides the inside of the valve box 23 into two chambers, an upstream chamber 25a and a downstream chamber 25b, by a seat plate 27,
The upstream chamber 25a is connected to the atmosphere, and the downstream chamber 2
5b is connected to the exhaust port 10, respectively.

〔Example〕

This invention will be explained below using examples.
1 is the engine body of the motorcycle, and the body frame 2
It is installed in. The engine body 1 is of a parallel four-cylinder type, and has a combustion chamber 6 formed by a cylinder 3, a piston 4, and a cylinder head 5. The combustion chamber 6 is connected to an intake port 8 through an intake valve 7.
and an exhaust port 10 through an exhaust valve 9. 11 is an air cleaner box connected to the intake port 8 via the carburetor 12; 14 is the exhaust port 1;
This is the exhaust pipe connected to 0. Reference numeral 15 denotes a secondary air introduction pipe, which forms a part of the secondary air passage 16. Its downstream end opens into the exhaust port 10, and its upstream side communicates with a check valve 18 via a rubber pipe 17. ing.

The check valve 18 has an elongated box-like appearance, and is attached along its longitudinal direction to a channel-shaped reinforcing member 21 installed between the pair of left and right main pipes 20, 20 of the vehicle body frame 2 at the rear upper part of the engine main body 1. It is fastened with bolts 22.

The inside of the valve box 23 has a plurality of valve chambers 25 divided into a plurality of sections by a partition wall 24, and a check valve element 18a consisting of a valve body 26 and a seat plate 27 is installed in the valve chamber 25.
is accommodated. 28 is a stopper for regulating the maximum opening degree of the valve body 26. The method for attaching the check valve 18 to the valve box 23 is as shown in FIGS. 3 and 4, by forming a groove 29 in the inner wall of the valve chamber, and inserting the seat plate 27 of the check valve 18 into this groove. It is prevented from coming off by the lid 30 of the valve box via the gasket 34. Valve chamber 2
5 is connected to the upstream chamber 25a by the check valve element 18a.
and a downstream chamber 25b, each of which has a vip joint 32 screwed into a screw hole 31.
The rubber pipe 17 and another rubber pipe 33 are connected to each other through the air cleaner box 11, and communicate with the air cleaner box 11.

Note that 35 is a fuel tank, and 36 is a seat for a passenger. FIG. 5 shows a modified configuration of the valve box 23, in which two seat plates 27 are arranged in a substantially V shape with one side close to each other and accommodated in one valve chamber 25, and a lid 30 closes the valve box 23. The box 23 is closed to form the check valve 18.

37 is a sealing member fitted to the outer periphery of the seat plate 27. In this configuration, since the two seat plates 27 are accommodated in one valve chamber 25, the number of partition walls 24 can be reduced compared to the case where a valve chamber 25 is provided for each seat plate 27. The outer shape of the valve box 23 can be reduced in size. Further, since the upstream chamber formed between the seat plates 27 is common to the two check valve elements 18a, the number of screw holes communicating with the air cleaner box 11 can be reduced, and the processing can be simplified.

7 and 8 show an example of a valve box 23 in which two valve chambers 25 housing two seat plates 27, 27 in the embodiment shown in FIG. 5 are installed together.

In the embodiments shown in FIGS. 5 to 8, the configurations of other parts are the same as in the case of FIG. 4 already explained, so corresponding symbols are given in the drawings and explanation thereof will be omitted.

[Effect of idea]

As described above, the exhaust purification device for a motorcycle according to this invention has exhaust ports 10 arranged in the width direction.
A secondary air passage 16 having a check valve 18 is connected to the holder, the check valve 18 is installed along the width direction of the vehicle body, and the secondary air passage 16 is piped. It is sufficient to simply insert the stop valve element 18a into the valve box 23, making assembly easy and reducing assembly errors.Furthermore, since the check valve is configured by housing a plurality of valve bodies in the elongated valve box, the overall length is shortened. This makes it possible to install the secondary air passages along the width direction of the vehicle body, and each secondary air passage 16 is routed between the exhaust pipe and the check valve 18 without intersecting with each other. It has great practical effects, such as eliminating complicated problems.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a side view of the motorcycle, Figure 2 is a Z-Z arrow view, Figure 3 is an enlarged sectional view of the main part, Figure 4 is a sectional view of the main part, and Figure 5 is a modification of the main part. FIG. 6 is an enlarged sectional view showing another embodiment, FIG. 7 is an enlarged sectional view of a main part showing another modification, and FIG. 8 is a sectional view thereof. 1...Engine body, 16...Secondary air passage,
18...Check valve, 18a...Check valve element.

Claims (1)

[Scope of claim for utility model registration] (1) Each exhaust port 10 of a multi-cylinder engine arranged in the width direction mounted on a motorcycle is connected to a check valve 1.
The check valve 18 is connected to a secondary air passage 16 equipped with a valve 8, and its check valve 18 is composed of a valve box 23 attached to the vehicle body and a check valve element 18a housed inside the valve box 23. 24 in the width direction, and houses therein a check valve element 18a composed of a seat plate 27 and a valve body 26, and the valve box 23
The interior is divided into two chambers, an upstream chamber 25a and a downstream chamber 25b, by a seat plate 27, and the upstream chamber 2
5a is connected to the atmosphere, and a downstream chamber 25b is connected to an exhaust port 10. (2) The exhaust gas purification device for a motorcycle according to claim 1, wherein two sets of seat plates are arranged in a substantially V-shape in a valve box, and their upstream chambers are shared with each other.