JPH01285601A - Water-cooled engine - Google Patents

Abstract

PURPOSE:To improve general purpose property of an engine by a method wherein a power takeoff mechanism is selectively mounted to an engine output shaft, a water pump mounted during of the power takeoff mechanism is differed from that during non-mounding thereof, and the mounting height of cooling fan is freely selectable. CONSTITUTION:When a power takeoff shaft 10a of a power takeoff mechanism 10 is mounted to a front engine output shaft 2c, a longitudinally long water pump 6 a pump shaft 6c of which is formed away from the output shaft 2c so that a cooling fan 7 is not interfered with the power takeoff shaft 10a is mounted. Meanwhile, an engine 1 is appropriated for a different vehicle in which there is not need to take off an output to the front, a cap not shown is mounted on the output shaft 2c. A laterally long water pump, not shown, having a pump shaft the mounting height of which is approximately equal to that of the output shaft 2c is provided. This constitution enables mounting of the cooling fan 7 approximately to the central part of the whole surface of the water-cooled engine 1, and enables the cooling fan 7 and a radiator to be situated at a preferable height.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a general-purpose water-cooled engine.

(Conventional technology) For example, a water-cooled engine mounted on an agricultural tractor has
As shown in Japanese Utility Model Application Laid-open No. 58-82932, there is a system in which output is also extracted from the front of the engine using a power extraction mechanism, and this output is used to rotate a rotary device provided at the front of the tractor.

Some of such water-cooled engines have a cooling fan integrated with the pump shaft in order to simplify the design as a general-purpose engine.

(Problems to be Solved by the Invention) In the water-cooled engine, the pump shaft is arranged at a position where the cooling fan and the power extraction mechanism do not interfere with each other.

As a result, the cooling fan is disposed away from the center of the water-cooled engine, and the radiator corresponding to the cooling fan is similarly disposed.

This water-cooled engine is also installed in vehicles that do not require a power extraction mechanism, increasing the versatility of the engine. However, in this case, the arrangement of the cooling fan and radiator is away from the center of the water-cooled engine, making the overall arrangement unnatural, which is not preferable.

(Means for Solving the Problems) The present invention has been made to solve the above problems.
Water pump locking means capable of locking either of two types of water pumps is provided in the cylinder block of the water-cooled engine of the present invention.

(Function) A power take-off mechanism is selectively installed on the engine output shaft, and when the power take-off mechanism is installed, a quarter pump is provided in the water-cooled engine to hold the cooling fan at a position where the power take-off mechanism and the cooling fan do not interfere; The water-cooled engine is provided with a water pump that positions the cooling fan approximately at the center of the water-cooled engine when the power extraction mechanism is not installed.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a front view of a water-cooled engine according to the present invention, and FIG. 2 is a sectional view of the same side.

A crankshaft 2, a fuel pump camshaft 3, and a supply/exhaust valve camshaft 4 are arranged in order from bottom to top on the front surface of the water-cooled engine 1, and pulleys 2a and 3a are fitted to the ends of these shafts, respectively.
, 4a, the timing belt 5 is passed through.

A V-pulley 2b is further fitted in front of the pulley 2a, and this front engine output shaft 2C is formed to protrude forward.

A rear engine output shaft (not shown) is formed at the other end of the crankshaft 2 to protrude rearward.

A water-cooled engine 1 surrounded by the pulleys 2a, 3a, and 4a.
A water pump 6 is disposed in a space in front of the.

The quarter pump 6 functions to circulate cooling water between the water-cooled engine 1 and a radiator (not shown), and as shown in FIG. 2, it consists of a pump housing 6a, an impeller 6b, and a pump shaft 6c.

The pump shaft 6c is pivotally supported by the pump housing 6a and protrudes forward, and a cooling fan 7 for the radiator is fitted to the pump shaft end 6d.

A V-pulley 8 is connected to the cooling fan 7 on the pump shaft 6c.
is provided integrally with the This V pulley 8 is driven by the V pulley 2b and the V belt 8a.

The pump housing 6a has taps 98 to 9 bored in the front surface 1b of the cylinder block 1a as shown in FIG.
d and the bolt B that screws into these taps 9a to 9d.
The cylinder block 1a is secured to the cylinder block 1a by the locking means 9 consisting of...
is fixed to.

With the above configuration, as shown in FIG. 2, the power extraction shaft 1 of the power extraction mechanism 10 is connected to the front engine output shaft 2C.
0a, the pump shaft 6c is connected to the output shaft 2c so that the cooling fan 7 does not interfere with the power take-off shaft 10a.
A vertically long water pump 6 formed apart from the water pump 6 is attached. The vertically long quarter pump 6 has four taps 9a to 9.
It can be installed by screwing bolt B into d. For example, while the tractor is running using the rear engine output shaft, it is possible to rotate a rotary tool placed in front of the tractor using the power take-off shaft 10a.

On the other hand, if the water-cooled engine 1 is to be used in another vehicle that does not require forward output, a cap 11 is provided in place of the power output shaft 10a, as shown in FIGS. 4 and 5. Then, a laterally elongated quarter pump 16 whose mounting height of the pump shaft is closer to the output shaft 2C is installed. This water pump! The water pump 6 differs only in its housing 18a from the water pump 6 described in FIGS. 1 and 2, and the other parts can be the same.

The water pump 16 also has a tap 9 as shown in FIG.
It is attached by screwing bolts B... to a to 9d.

Therefore, as shown in FIGS. 4 to 6, the cooling fan 7 is provided approximately at the center of the front surface of the water-cooled engine 1, and the cooling fan 7 and the radiator are arranged at a preferable height.

The locking means 9 may be a tap bolt, a bolt/nut, a clamp, etc., as long as it can lock either of the two types of water pumps 6.16 on the front surface of the cylinder block. .

Further, the power extraction mechanism 10 is not limited to the power extraction shaft 10a, and may be any mechanism that extracts and transmits power, such as a reduction gear or a gear device.

(Effects of the Invention) As described above, the present invention allows two types of water pumps to be installed, and the mounting height of the cooling fan can be freely selected depending on whether or not there is a power take-off mechanism. When installed, the cooling fan can be placed approximately in the center of the water-cooled engine, thereby increasing the versatility of the water-cooled engine.

[Brief explanation of the drawing]

Fig. 1 is a front view of a water-cooled engine according to the present invention, Fig. 2 is a sectional view of the same side, Fig. 3 is an explanatory diagram of installing a water pump, and Fig. 4 is a front view of a water-cooled engine with another water pump attached. , FIG. 5 is a sectional view of the same side, and FIG. 6 is an explanatory diagram of the installation of the same quarter pump. In the drawings, 1 is the water-cooled engine according to the present invention, 1b is the front surface of the cylinder block, 2c is the front engine output shaft,
6 is a quarter pump, 6c is a pump shaft, 7 is a cooling fan, 9 is a water pump locking means, 10 is a power extraction mechanism, and 16 is another water pump.

Claims (2)

[Claims] (1) In a water-cooled engine in which a cooling fan is integrally provided on a water pump shaft and the pump shaft is rotated by an engine output shaft, a power extraction mechanism is selectively installed on the engine output shaft, and the power extraction mechanism is installed. Sometimes, the water-cooled engine is provided with a water pump that holds the cooling fan in a position where the power take-off mechanism and the cooling fan do not interfere with each other, and when the power take-off mechanism is not installed, a water pump that positions the cooling fan approximately in the center of the water-cooled engine is provided. A water-cooled engine characterized in that the water-cooled engine is provided with a. (2) The water-cooled engine according to claim 1, wherein the cylinder block of the water-cooled engine is provided with locking means capable of locking either of the two types of water pumps.