JPH0343368Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cooling water extraction structure for a motorcycle equipped with a water-cooled engine, and more particularly to a cooling water extraction structure for a water-cooled engine equipped with a double overhead camshaft.

FIG. 1 is a conceptual diagram of a water-cooled engine 1 showing a conventional cooling water extraction structure for a water-cooled engine mounted on a motorcycle.

As shown in FIG. 1, in order to take out the cooling water from the cylinder head 2 of the water-cooled engine 1 or the cylinder head cover 3 that covers the cylinder head 2, it is necessary to Cooling water outlet ports 2a', 2b', 3a' are formed at predetermined positions on the upper surface 3a of the head cover 3 to protrude perpendicularly to the surface.
Cooling water is taken out by a union joint 4 attached to a', and the cooling water is passed through a tube such as an elastic body connected to the union joint 4 to, for example, an inlet port of a radiator (not shown). I was planning on sending it. In addition, the reference numeral 5 in FIG. 1 is a cylinder block.

By the way, according to the conventional cooling water extraction structure described above, the cylinder head 2 of the water-cooled engine 1
Cooling water outlet ports 2a', 2b', and 3a' are formed protruding perpendicularly to the front surface 2a or side surface 2b of the cylinder head cover 3, or the upper surface 3a of the cylinder head cover 3, and these outlet ports 2a', 2b' ,3
Since the union joint 4 is attached to a', the installation length of the union joint 4 (G, H, I in Figure 1) occupies the space around the water-cooled engine 1, making it compact. It was difficult to build a water-cooled engine. According to the conventional cooling water extraction structure shown in FIG. 1, an exhaust pipe, the passenger's legs, the vehicle body frame, etc. (not shown) are located in front, on the sides, and above the water-cooled engine 1, respectively. As a result, the space around the water-cooled engine 1 is further restricted, resulting in a disadvantage that the ease of maintenance and inspection of the water-cooled engine 1 is significantly reduced.

The purpose of this invention is to solve the above-mentioned conventional problems.
This product provides a cooling water extraction structure for water-cooled engines that makes the engine more compact and improves maintenance and inspection workability. Utilizing the engine's dead space created by the wall of the cam chain chamber that protrudes from the surface of the cylinder head cover,
A cooling water outlet port is formed in this dead space along the width direction of the engine.

Hereinafter, a cooling water extraction structure for a water-cooled engine according to the present invention will be described in detail.

FIGS. 2 and 3 are a side view of the water-cooled engine 10 showing a cooling water extraction structure for the water-cooled engine according to the present invention, and a front view of the main parts thereof as viewed from arrow A.

This water-cooled engine 10 has a so-called twin camshaft structure in which two camshafts (not shown) are arranged in a cylinder head block 11. Cam chain chamber walls 11a and 12a, which respectively constitute passages for cam chains (not shown) that drive the camshafts, are formed to protrude.

In the engine 10 of this embodiment, the cam chain chamber walls 11a and 12a of the engine 10 are made to protrude along the surface of the engine, and the protruding portion 1
3 is formed with a water channel (not shown), the open end of which is formed on the side surface 13a of the projecting portion 13, and a union joint 14 is installed on the side surface.

In the engine 10 of this embodiment, the cooling water pipe 15 connected to the union joint 14
is guided to the side of the engine 10 along the front or rear surface of the cylinder head 11, further along the side of the engine, and guided to the rear or front of the engine 10.

In FIGS. 2 and 3, reference numeral 16 is a cylinder block, 17 is a crankcase, 18 is an inlet port of the engine, and 19 is an outlet port.

In the above embodiment, the projecting portion 13 is formed on the cam chain chamber wall 11a formed on the cylinder head 11.
However, the present invention is not limited to the above-mentioned embodiment, and the projecting portion 13 is formed to protrude from the side surface 11a' of the cylinder head cover 12 along the width direction of the engine. It may be formed so as to protrude from both side surfaces 12a' of the wall 12a along the width direction of the engine.Furthermore, as shown by the dashed line in FIG. Cam chain room wall 11
The cam chain chamber walls 11a and 12a may be formed to protrude in the width direction of the engine from both side surfaces 11a' of the cylinder head 11 and the cylinder head cover 12.
By utilizing the dead space formed by the side surfaces 11a' and 12a' of the engine and the width direction of the engine, a cooling water outlet port such as a union joint 14 can be formed there to protrude in the width direction of the engine. The cooling water outlet port may be formed at any position.

As described above, the present invention has a water-cooled engine having a twin cam structure with a cooling water outlet port formed protrudingly on the side surface of the cam chain chamber wall protrudingly formed along the width direction of the engine. Therefore, it is possible to construct a compact water-cooled engine, and it is also possible to facilitate maintenance and inspection of parts and the like attached around the water-cooled engine.

[Brief explanation of drawings]

Fig. 1 is a conceptual diagram of a water-cooled engine showing a cooling water take-out structure of a water-cooled engine in a conventional motorcycle; Fig. 2 is a side view of a water-cooled engine showing a coolant take-out structure of a water-cooled engine according to the present invention;
The figure is a front view of the main parts as viewed from arrow A in FIG. 2. DESCRIPTION OF SYMBOLS 10...Water-cooled engine, 11...Cylinder head block, 11a, 12a...Cam chain chamber wall, 11a', 12a'...Side surface, 12...Cylinder head cover, 13...Protrusion part.

Claims (1)

[Scope of utility model registration request] In a water-cooled motorcycle engine equipped with a double overhead camshaft in which cam chain chambers are formed protruding from the surfaces of a cylinder head and a cylinder head cover, an outlet port for taking out cooling water from the water-cooled engine is provided as described above. A cooling water extraction structure for a water-cooled engine, characterized in that the cooling water extraction structure for a water-cooled engine is formed on the side surface of a cam chain chamber wall forming a cam chain chamber so that the direction thereof is along the width direction of the engine.