The present invention relates to a saddle type vehicle having a water cooled engine.
Conventionally, as a saddle type vehicle having a water cooled engine, there is known, as disclosed, for example, in Patent Document 1, one equipped with a thermostat 94 (FIG. 5) provided in a cooling water path of a water cooled engine 16, and a check valve 82 (FIG. 6) provided in a secondary air path supplying secondary air to an exhaust path of the water cooled engine 16.
[Patent Document 1]
In the conventional saddle type vehicle having a water cooled engine, the thermostat 94 and the check valve 82 are formed as separate components, which are respectively and individually mounted to the engine 16, resulting in a rather complicated structure.
It is an object of the present invention to provide a saddle type vehicle with a water cooled engine allowing simplification of the mounting structure of the thermostat provided in the cooling water path of the water cooled engine and that of the check valve provided in the secondary air path supplying secondary air to the exhaust path.
To achieve the above object, there is provided, in accordance with the present invention, a saddle type vehicle having a water cooled engine, including: a thermostat provided in a cooling water path of the water cooled engine; and a check valve provided in a secondary air path supplying secondary air to an exhaust path of the water cooled engine, in which a case of the thermostat and a case of the check valve are formed integrally.
In this saddle type vehicle having the water cooled engine, the case of the thermostat and the case of the check valve are formed integrally, so that it is possible to achieve simplification in structure and a reduction in production cost. Further, the mounting structure can be simplified.
In this saddle type vehicle having a water cooled engine, the case of the thermostat is formed in a cylindrical configuration, and the case of the check valve may be integrally connected to the cylindrical side wall thereof.
In this construction, the connection portion (connection area) between the case of the thermostat and the case of the check valve can be reduced in size, so that, even when the check valve attains high temperature, that heat can be prevented from being easily transmitted to the case of the thermostat.
In this saddle type vehicle having the water cooled engine, a through-hole for a fixation bolt may be provided between the case of the thermostat and the case of the check valve, and the thermostat and the check valve may be fixed to the water cooled engine by a bolt extending through this through-hole.
In this construction, the through-hole for the fixation bolt is provided between the case of the thermostat and the case of the check valve, whereby, even when the check valve attains high temperature, that heat can be prevented from being easily transmitted to the case of the thermostat.
In this saddle type vehicle having a water cooled engine, the water cooled engine is equipped with a crankcase arranged below, a cylinder extending upwardly from this crankcase, and an exhaust pipe which is connected to an exhaust outlet provided in front of this cylinder and which extends from the front of the cylinder toward a side of the cylinder so as to be curved as it extends rearwards; and
the thermostat and the check valve may be fixed to the side portion of the cylinder above the crankcase, at the rear of the curved portion of the exhaust pipe, and on the inner side of the exhaust pipe.
In this construction, the thermostat and the check valve can be protected by the crankcase on the lower side, by the curved portion of the exhaust pipe on the front side, and by the exhaust pipe and the cylinder sidewise.
Thus, there is no need to separately provide a protection member, thereby making it possible to achieve a reduction in cost.
In the following, a saddle type vehicle having a water cooled engine according to an embodiment of the present invention will be described with reference to the drawings. The drawings should be viewed according to the orientation of the reference symbols. In the following description, the forward and rearward directions, the leftward and rightward directions, and the upward and downward directions are those as viewed from the driver, and, as needed, symbols Fr, Rr, L, R, U, and D respectively standing for the forward, rearward, leftward, rightward, upward, and downward directions of the vehicle are indicated in the drawings. In the drawings, the same or equivalent parts are indicated by the same reference symbols.
In a saddle type vehicle 1 having a water cooled engine depicted in
As depicted in
A case 41 of the thermostat 40 and a case 61 of the check valve 60 are formed integrally.
In this saddle type vehicle 1 having a water cooled engine, the case 41 of the thermostat 40 and the case 61 of the check valve 60 are formed integrally, so that it is possible to simplify the structure of the thermostat 40 and the check valve 60 and to produce them at low cost. Further, the mounting structure for the thermostat 40 and the check valve 60 can also be simplified.
The case 41 of the thermostat 40 and the case 61 of the check valve 60 can be formed integrally of a well-known metal.
The case 41 of the thermostat 40 is formed in a cylindrical configuration, and the case 61 of the check valve 60 is integrally connected to a cylindrical side wall 42 thereof.
In this construction, the connection area of a connection portion 62 between the case 41 of the thermostat 40 and the case 61 of the check valve 60 (the area of the connection portion 62 as seen from the direction of arrow B in
Between the case 41 of the thermostat 40 and the case 61 of the check valve 60 (i.e., in the above-mentioned connection portion 62), there is provided a through-hole 62h (see
In this construction, the through-hole 62h for the fixation bolt 70 is provided between the case 41 of the thermostat 40 and the case 61 of the check valve 60, whereby even when the check valve 60 attains high temperature, it is possible to prevent the heat from being easily transmitted to the case 41 of the thermostat 40.
The water cooled engine 20 is equipped with a crankcase 22 arranged below, a cylinder 23 (including a cylinder head 25) extending upwards from the crankcase 22, and an exhaust pipe 24 (
The thermostat 40 and the check valve 60 are fixed to a side portion 25s of the cylinder head 25 (
That is, the thermostat 40 and the check valve 60 are arranged in a space S1 defined above the crankcase 22, at the rear of the curved portion 24c of the exhaust pipe 24, and on the inner side of the exhaust pipe 24 (see
In this construction, the thermostat 40 and the check valve 60 can be protected by the crankcase 22 on the lower side, by the curved portion 24c of the exhaust pipe 24 on the front side, and by the exhaust pipe 24 and the cylinder 23 sideways.
Thus, there is no need to separately provide a protection member for the thermostat 40 and the check valve 60, making it possible to achieve a reduction in cost.
In
As depicted in
a water pump 31→a water jacket in the crankcase 22 of the water cooled engine 20 (an outflow path outer wall leading to a water jacket of the cylinder from the above-mentioned water jacket is indicated by reference symbol 22b)→The water jacket of the cylinder 23 of the water cooled engine 20 (an inflow path outer wall to the water jacket is indicated by reference symbol 23b)→a water jacket 25w of the cylinder head 25 (
The basic construction of the thermostat 40 is well-known in the art. As mainly depicted in
The valve body 43 is equipped with a shaft portion 43a, a valve portion 43r provided at one end side of this shaft portion 43a and configured to open and close the radiator side valve port 41r, and a valve portion 43p provided at the other end side of the shaft portion 43a and configured to open and close the water pump side valve port 41p.
When the temperature of the cooling water flowing into the case 41 of the thermostat 40 from an outflow path 25b (
On the other hand, when the temperature of the cooling water flowing into the case 41 of the thermostat 40 from the outflow path 25b (
As mainly depicted in
As depicted in
In
As depicted in
The upstream chamber 61a communicates with a control valve (not depicted) via a pipe 51, and further communicates with the atmosphere via an air cleaner (not depicted).
As indicated by a phantom line in
Thus, the secondary air is supplied to the exhaust port 21p and the exhaust path 21 of the engine via the air cleaner, the control valve, and the check valve 60.
In
The above-described embodiment of the present invention should not be construed restrictively. The present invention allows modifications as appropriate without departing from the scope of the gist of the invention.
Number | Date | Country | Kind |
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2016-192134 | Sep 2016 | JP | national |
Number | Name | Date | Kind |
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4300718 | Beyer | Nov 1981 | A |
6679431 | Mathew | Jan 2004 | B1 |
20020023596 | Hirano | Feb 2002 | A1 |
20040216726 | Hori | Nov 2004 | A1 |
20100170456 | Watanabe et al. | Jul 2010 | A1 |
20130221116 | Tsuchiya | Aug 2013 | A1 |
Number | Date | Country |
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1132586 | Sep 2001 | EP |
3816291 | Aug 2006 | JP |
2017-125467 | Jul 2017 | JP |
Entry |
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Extended European Search Report dated Jan. 4, 2018, for corresponding European Application No. 17193993.7. |
Number | Date | Country | |
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20180087441 A1 | Mar 2018 | US |