Internal-combustion engines – Cooling – With liquid coolant circulating means
Reexamination Certificate
1998-09-14
2001-07-31
Wolfe, Willis R. (Department: 3747)
Internal-combustion engines
Cooling
With liquid coolant circulating means
C123S041090
Reexamination Certificate
active
06267087
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a water-cooled engine, and more particularly, to a piping structure between a water pump and a thermostat valve.
2. Description of the Background Art
A water-cooled engine has a cooling system including a water jacket, a thermostat valve, a radiator, and a water pump, with water hoses extending therebetween. Moreover, such a structure is known where a bottom bypass type thermostat valve is utilized such that the thermostat valve and the water pump are connected with a bypass hose, and cooling water is returned from the thermostat valve to the water pump when the temperature of the water is low. One example is shown in Japanese Utility Model Publication No. 8-5326.
Generally, in a single cylinder engine or parallel multi-cylinder engine, a thermostat and a carburetor are disposed within a space above a crankcase, which is provided close to a cylinder. Moreover, a starter motor is provided above the crankcase. Further, a water pump is provided under the crankcase.
Therefore, a space for adjusting the carburetor tends to be reduced because of water hoses that interconnect the thermostat valve, water pump, water jacket, and radiator. Further, the number of hoses increases when a bottom-bypass-type thermostat valve is used. Thus, it is difficult to create a space for such hoses without affecting the layout of other parts which are provided nearby.
SUMMARY OF THE INVENTION
It is an object of the invention to solve the above problems. In the present invention, the water piping connected between the rear surface of the engine and the water pump without passing over the upper part of the starter motor. This arrangement makes it possible to effectively utilize the space over the starter motor, thereby making the work of adjusting the carburetor easier.
The water hose passing between the outlet of the thermostat and the water pump passes through the plane of projection in the axial direction of the starter motor so that it is possible to position the water piping along the crankcase. With the piping positioned on the depth side of the starter motor as viewed from the water pump, the appearance is improved.
A sensor for measuring the vehicle speed is arranged on the upper surface of the crankcase. The water piping crosses in front of this sensor, thereby making it possible to effectively utilize the space between the starter motor and the sensor.
A thermostat case is directly attached on the air intake port side of the cylinder head of the engine so that it is possible to make the communication passage between the cylinder head and the thermostat case shorter, thereby simplifying the water piping path.
The water hose may be a bypass hose for the bottom bypass-type thermostat case so that, even in a bottom bypass-type cooling system with many pipes, it is possible to effectively utilize the space when laying pipes.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
REFERENCES:
patent: 4399776 (1983-08-01), Shikata
patent: 4545333 (1985-10-01), Nagumo et al.
patent: 5022354 (1991-06-01), Okita et al.
patent: 5503118 (1996-04-01), Hollis
patent: 5715776 (1998-02-01), Seidl
patent: Y28-5326 (1996-02-01), None
Ohshita Tohru
Shiozaki Eiko
Takahashi Katsunori
Birch & Stewart Kolasch & Birch, LLP
Harris Katrina B.
Honda Giken Kogyo Kabushiki Kaisha
Wolfe Willis R.
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