JPS62197624A - Water pump device in water cooling type internal combustion engine - Google Patents

Abstract

PURPOSE:To hold down the projection of a water pump toward the outside of an engine so as to compact them, by forming the impeller of the water pump which is provided coaxially with a crankshaft in such a configuration wherein the diameter is gradually enlarged axially from an inlet side to a discharge side. CONSTITUTION:The pump axis 5 of a water pump P is connected to one end of a crankshaft 2, and the pump axis 5 is rotatably supported on a pump case 9 via a bearing 10. An impeller 15 is received in the pump chamber 14 of this pump case 9 in such a manner that its inlet side is directed the side of the crankshaft 2, and is stuck to the axis end of the pump axis 5. And the impeller 15 is formed in such a configuration wherein the diameter is gradually enlarged axially from an inlet side to a discharge side. Accompanying to this, the diameter of the pump case 9 is gradually reduced inwardly, or toward the side of the crankshaft 2. Thus, the water pump P and a clutch C can be disposed lappingly in the radial directions, so that whole the engine can be compacted.

Description

DETAILED DESCRIPTION OF THE INVENTION A1 OBJECTS OF THE INVENTION fll Industrial Application Field The present invention relates to a water pump device for forced circulation of cooling water in a water-cooled internal combustion engine.

(2) Conventional technology In a water-cooled internal combustion engine, a crankshaft and a transmission main shaft of a transmission mechanism are provided in parallel in the crankcase, and a water pump connected to the crankshaft and a clutch connected to the transmission main shaft are connected to the crankcase. Those arranged side by side on the shaft are conventionally known (see Japanese Utility Model Application Publication No. 19721/1983).

(3) Problems to be Solved by the Invention In the internal combustion engine mentioned above, the distance between the crankshaft and the transmission main shaft of the transmission mechanism is determined by the mutual arrangement of the crankshaft and the transmission mechanism, so the shaft is coaxial with the transmission main shaft. If the diameter of the clutch outer is increased in order to increase the capacity of the on-line clutch, the diameter of the impeller of the water pump on the same axis as the crankshaft will become smaller, making it impossible to obtain the desired capacity. If the diameter of the impeller is made large, the diameter of the clutch outer becomes small, causing a problem in that the desired capacity of the clutch cannot be obtained. Furthermore, if the water pump and the clutch outer are arranged so as to be offset from each other in their axial directions in order to solve this problem, the water pump will protrude significantly outward from the engine, resulting in an increase in the size of the engine. Another problem arises.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a water pump device for a water-cooled internal combustion engine with a simple configuration of N, which can solve all of the above-mentioned problems.

B9 Structure of the Invention (1) Means for Solving Problems According to the present invention, in order to achieve the above-mentioned object, a crankshaft and a rotating shaft interlocked with the crankshaft are provided in parallel in the crankcase. In a water-cooled internal combustion engine in which a water pump interlocked with the crankshaft and devices such as a clutch interlocked with the rotary shaft are arranged radially side by side on one side of the shaft, the impeller of the water pump is The diameter is gradually expanded in the axial direction from the suction side to the discharge side, with the suction side facing the crankshaft side.

(2) Effects According to the above configuration, it is possible to secure the required capacity of the water pump without protruding the water pump to the outside of the engine. It is also possible to shorten the distance between supported rotating shafts.

(3) Examples Embodiments of the present invention will be described below with reference to the drawings.

A crankcase 1 of a water-cooled internal combustion engine includes a crankshaft 2.
is rotatably supported, and a transmission main shaft 3 of the mission mechanism M is rotatably supported in parallel thereto.

A drive gear 4 is fixed to one end of the crankshaft 2, and a pump shaft 5 of a water pump P, which is disposed on the extended axis of the crankshaft 2, is connected to the crankshaft 2 so that it can rotate together with the crankshaft 2. ing.

Further, a clutch C having a conventionally known structure is supported at one end of the speed change main shaft 3, and both large-diameter driven arms 7 are integrally provided on the outer periphery of a clutch outer 6 of this clutch C. 7 is meshed with the drive gear 4, and the rotation of the crankshaft 2 is transmitted via the clutch C to the transmission main gear l1ITo3 of the mission a to M.

The crankcase 1 includes a crankcase body II;
The main body 1. A part of the crankcase cover 1□ constitutes the pump case 9 of the water pump P.

The pump shaft 5 is rotatably supported by the pump case 9 via a ball bearing 10. Further, an oil seal 11 and a water seal 12 are interposed between the pump shaft 5 and the pump case 9, and these seals 11 and 12 form a seal between the crank chamber 13 and the pump chamber 14. The pump chamber 14 is a suction chamber 14 formed in the pump case 9.
It consists of a discharge chamber 140 and a swirl chamber 14S, which will be described later, which communicates these chambers i4t and xo.

The water pump P is a centrifugal pump, and an impeller 15 is fixed to the end of the pump shaft 5 with its suction side 15i facing inward, that is, toward the crankshaft 2 side.
has a suction side 151 on its inner periphery and a discharge side 150 on its outer periphery, and is formed in a shape whose diameter gradually increases in the axial direction from the suction side 15i toward the discharge side 150.

Therefore, the impeller 15 has a small diameter suction side 15i as described above.
By pointing inward, that is, toward the crankshaft 2 side, the ribbon case 9 is also formed to have a gradually smaller diameter toward the inside, that is, toward the crankshaft 2 side.

A cover case 1 is provided on the open outer surface of the pump case 9.
6 is fixed by a plurality of connecting bolts 17, and this cover case 16 forms the swirl chamber 14s that constitutes a part of the pump chamber 14, and the discharge side 150 of the impeller 15 is located within the swirl chamber 143. There is.

A plate-shaped separator 19 is sandwiched between the pump case 9 and the cover case 16, and the separator 19 and the cover case 16 are collinear with the pump case 9 through the connection port 17.

The separator 19 partitions the suction chamber 14i and the discharge chamber 14o so as not to short-circuit, and the separator 19 includes:
A suction port 20 concentric with the pump shaft 5 is opened, and a communication hole 21 is opened on one side thereof, and the suction port 20 communicates the suction chamber 14i with the suction side 15i of the impeller 15.
Further, the communication hole 21 allows the volute chamber 143 communicating with the discharge side 15o of the impeller 15 to communicate with the discharge chamber 14o formed in the pump case 9.

The pump case 9 is formed with a suction passage 22 communicating with the suction chamber 14i and a discharge passage 23 communicating with the discharge chamber 140.The suction passage 22 is connected to a radiator circuit 24, and the discharge passage 23 is connected to the internal combustion engine. It is communicated with a water jacket (not shown). Since both the suction passage 22 and the discharge passage 23 are formed integrally with the pump case 9, both of these passages 22 and 23 can be arranged near the engine crankcase 1, and the engine This can contribute to compactness.

Next, the operation of the embodiment will be explained.

When the engine is operated now, the pump shaft 5 is rotated, and the impeller 15 fixed to it causes the cooling water from the radiator circuit 24 to enter the suction chamber 141 through the suction passage 22 as shown by the arrow in the figure. It is pressurized by the impeller 15 and flows through the volute chamber 14s to the discharge chamber 140, and from there through the discharge passage 23 to the water jacket in the engine.

The impeller 15 of the water pump P has a small diameter on the suction side 1.
5i is directed inward, that is, toward the crankshaft 2 side, the pump case 9 can also be formed to have a smaller diameter near the crankshaft 2, and the water pump I) and the clutch C can be arranged so as to overlap in the radial direction. However, the water pump P can have a desired capacity without being restricted by the outer diameter of the clutch C.

It should be noted that the present invention can be modified in various ways without departing from its gist; for example, in the embodiment described above, the water pump P was directly driven by the crankshaft 2; It may be arranged parallel to the shaft and driven by the crankshaft via an appropriate transmission mechanism. Further, other equipment such as a generator may be arranged in parallel with the water pump in addition to the clutch of the above embodiment.

C9 Effects of the Invention As is clear from the above examples, according to the present invention,
A crankshaft and a rotating shaft linked to the crankshaft are provided in parallel to the crankcase, and on one side of these shafts, a sewage pump linked to the crankshaft, a clutch linked to the rotating shaft, etc. In a water-cooled internal combustion engine, the impeller of the water pump has a diameter that gradually increases in the axial direction from the suction side to the discharge side, with the suction side facing the crankshaft side. Therefore, the water pump of the desired capacity can be installed without protruding outward from the engine (the distance between the crankshaft and the rotating shaft that supports the equipment can also be shortened). This makes it possible to improve the water cooling efficiency of the engine, reduce the force Z, and make the engine more compact.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a vertical cross-sectional side view of the device of the present invention taken along the line 1-I in FIG.
Figure 3 is a longitudinal cross-sectional side view taken along the line nn. Figure 3 is similar to Figure 1.
It is a cross-sectional view along the -■ line.

Claims (1)

[Claims] A crankshaft and a rotating shaft linked to the crankshaft are provided in parallel to the crankcase, and on one side of these shafts, a water pump linked to the crankshaft, a clutch linked to the rotating shaft, etc. are installed. In a water-cooled internal combustion engine, the impeller of the water pump has a diameter that gradually increases in the axial direction from the suction side to the discharge side, with the suction side facing the crankshaft side. A water pump device for a water-cooled internal combustion engine, characterized by: