JP3150876B2 - Cooling device for slant type internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called slant type internal combustion engine in which the axis of a cylinder bore in a cylinder block is inclined (slant) with respect to a horizontal plane when viewed from the direction of a crankshaft. is there.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 4-77134 as prior art.
Japanese Patent Application Laid-Open Publication No. H11-163873 discloses a cooling device for the slant type internal combustion engine, in which a cooling water outlet pipe to a radiator upper tank is connected to a cooling water outlet from a cooling water jacket in a cylinder head fastened to an upper surface of a cylinder block. A thermostat valve case is integrally provided on the longer side of the left and right sides of the cylinder block that is inclined upward, and a cooling water return line from the lower tank of the radiator is connected to the thermostat valve case. , Inside this thermostat valve case,
The cooling water communicates with a suction side of a cooling water pump that supplies cooling water to a cooling water jacket in the cylinder block, and into the thermostat valve case, when the temperature of the cooling water is low, the cooling water return line into the thermostat valve case. There has been proposed a cooling device provided with a thermostat valve configured to cut off the communication and connect the cooling water return line to the inside of the thermostat valve case when the temperature of the cooling water is high.

In this cooling device, when the thermostat valve is operated, the cooling water passes through a bypass passage in a cooling water jacket in a cylinder block and a cooling water jacket in a cylinder head in a warm-up operation in which the temperature is low. Circulating between the high temperature
The flow of the bypass passage is interrupted to circulate between the cooling water jacket in the cylinder block and the cooling water jacket in the cylinder head and the radiator.

[0004] In this cooling apparatus, it is necessary to provide a jiggle pin valve for bleeding air when injecting cooling water in the thermostat valve so as to bypass the thermostat valve.

[0005]

In this case, conventionally, a thermostat valve provided with a jiggle pin valve has a substantially horizontal axis as described in, for example, Japanese Utility Model Laid-Open No. 60-91869. The jiggle pin valve is mounted on a valve seat plate that has a flat surface perpendicular to its axis.
The jiggle pin valve is provided so as to penetrate the valve seat plate at right angles.

However, when this conventional thermostat valve having a jiggle pin valve is applied to the above-described cooling device for a slant type internal combustion engine, there are the following problems. That is, when the thermostat valve case is integrally provided on the longitudinal side that becomes upper due to the inclination of the left and right longitudinal sides of the cylinder block, and the thermostat valve is provided in the thermostat valve case, the axis of the thermostat valve is: The jig pin valve which is inclined with respect to the horizontal plane and therefore also at right angles to this axis is also provided so as to penetrate in a direction perpendicular to this valve seat plate by being inclined with respect to the horizontal plane. Is in a closed state due to its weight, and becomes a state in which it hardly plays a role of air bleeding at the time of injecting the cooling water, which leads to a situation that the cooling water cannot be injected into the thermostat valve case. Become.

Therefore, conventionally, air is vented by forming a small hole of several millimeters in the valve seat plate of the thermostat valve. However, the small hole may be clogged. In addition, in the warm-up operation state, the cooling water cooled by the radiator flows into the thermostat valve case through the small holes, so that the temperature rise of the cooling water is delayed. Not only did the heating performance of the car heater during operation deteriorate, but also the time required for the warm-up operation became longer.

An object of the present invention is to provide a cooling device for a slant type internal combustion engine that solves these problems.

[0009]

In order to achieve this technical object, the present invention provides a cylinder block in which the axis of a cylinder bore in a cylinder block is inclined with respect to a horizontal plane, and an upper side of the left and right longitudinal sides of the cylinder block is inclined. A thermostat valve case is integrally provided on the longitudinal side of the cylinder block, a cooling water return line from a radiator is connected to the thermostat valve case, and cooling water is supplied to the cylinder block inside the thermostat valve case. A cooling water outlet in the cylinder head is connected to a cooling water outlet line to an upper tank of a radiator while communicating with a suction side of the cooling water pump, and the cooling water is supplied to the thermostat valve case when the temperature of the cooling water is low. Cut off the communication of the return line into the thermostat valve case, and when the temperature of the cooling water is high, In a slant type internal combustion engine provided with a thermostat valve configured to communicate a recirculated water return line within a thermostat valve case, an embossed portion is formed on a valve seat plate of the thermostat valve, and an embossed portion is partially formed on the embossed portion. A jiggle pin valve is provided so as to form a vertical surface, and a jiggle pin valve is provided so as to penetrate a substantially vertical surface portion of the embossed portion. "
It was configured to say.

[0010]

[Operation] As described above, the embossed portion is provided on the valve seat plate of the thermostat valve so as to form a substantially vertical surface in a part of the embossed portion. By providing the pin valve so that the jiggle pin valve penetrates, when the thermostat valve is inserted into a thermostat valve case integrally provided on the upper longitudinal side surface of the cylinder block, the axis of the thermostat valve is in a horizontal plane. When the cooling water is injected, it is possible to prevent the jiggle pin valve from being in the closed state because the axis of the jiggle pin valve can be set to be substantially horizontal. Air can be removed.

[0011]

Therefore, according to the present invention, in a cooling device for a slant type internal combustion engine, it is not necessary to form a valve seat plate for a thermostat valve, as in the prior art, particularly, a small hole for venting air. Therefore, it is possible to secure a reliable air release, shorten the time required for warm-up, and improve the heating performance of the car heater during the warm-up operation.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In the drawing, reference numeral 1 denotes a slant type internal combustion engine in which the axis 1a of the cylinder bore is inclined at an appropriate angle θ with respect to a horizontal plane 2 when viewed from the direction of the crankshaft 1b, and the internal combustion engine 1 has a cooling water jacket 3a inside. , An oil pan 4 fastened to the lower surface of the cylinder block 3, and a cylinder head 5 fastened to the upper surface of the cylinder block 3.

A thermostat valve case 6 is integrally formed on one of the left and right long side surfaces of the cylinder block 3 of the internal combustion engine 1 which becomes upper due to the inclination, and an elbow pipe joined to the thermostat valve case 6 is formed. 7, a lower tank 8 of a radiator 8 indicated by a two-dot chain line.
The cooling water return line 9 from a is connected. In the cylinder block 3, a cooling water pump 10 driven by power transmission from the crankshaft 1 b has a suction side of the cooling water pump 10 through the passage 11 into the thermostat valve case 6, and a discharge side thereof. Passage 1
2 are provided so as to communicate with the cooling water jacket 3a of the cylinder block 3 via the respective cylinders 2.

On the other hand, a cooling water outlet pipe 13 from the cooling water jacket 5a of the cylinder head 5 to the upper tank 8b of the radiator 8 is connected to a cooling water outlet 5b. Further, inside the cylinder block 3, a cooling water outlet 5b in the cylinder head 5 is provided.
And a bypass passage 14 that communicates with the inside of the thermostat valve case 6.

Reference numeral 15 denotes a bottom bypass type thermostat valve having a valve seat plate 15a. The thermostat valve 15 has an outer peripheral portion of the valve seat plate 15a inside the thermostat valve case 6 and the thermostat valve case. The thermostat valve 15 is inserted between the elbow pipe 6 and the elbow pipe 7, and the thermostat valve 15 of the cooling water return pipe 9 when the temperature of the cooling water is low.
The cooling water is blocked and the bypass passage 14 from the cooling water outlet 5b is connected to the thermostat valve case 6, and the cooling water return line 9 is connected to the thermostat valve case 6 when the temperature of the cooling water is high. At the same time, it operates to cut off the communication of the bypass passage 14 into the thermostat valve case 6.

Thus, the cooling water in the cooling water jacket 3a of the cylinder block 3 and the cooling water jacket 5a of the cylinder head 5 passes through the bypass passage 14 by the cooling water pump 10 when the temperature is low. When the temperature rises, the cooling water pump 10
Thus, the coolant circulates through the cooling water outflow pipe 13 and the cooling water return pipe 9 with the radiator 8.

As shown in FIG. 4, an embossed portion 1 is provided on the valve seat plate 15a of the thermostat valve 15.
6 is provided so as to form a substantially vertical surface 16 a in a part of the embossed portion 16, and the jiggle pin valve 17 penetrates the jiggle pin valve 17 through the substantially vertical surface 16 a in the embossed portion 16. It is provided as follows.

With such a configuration, when the thermostat valve 15 is inserted into the thermostat valve case 6 integrally provided on the upper longitudinal side surface of the cylinder block 3, the axis 15b of the thermostat valve 15 moves in a horizontal plane. Even when the cooling water is inclined, the axis 17a of the jiggle pin valve 17 attached to the valve seat plate 15a of the thermostat valve 15 can be set to a substantially horizontal posture. Since the pin valve can be prevented from being closed, it is possible to reliably perform air bleeding with the jiggle pin valve 17 without forming a small hole for air bleeding in the valve seat plate 15a as in the related art. You can do it.

[Brief description of the drawings]

FIG. 1 is a front view of a slant type internal combustion engine showing an embodiment of the present invention.

FIG. 2 is a vertical sectional front view showing a main part of FIG. 1;

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is an enlarged view showing a main part of the thermostat valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Internal-combustion engine 1a Cylinder bore axis 1b Crankshaft 2 Horizontal surface 3 Cylinder block 3a Cylinder block cooling water jacket 5 Cylinder head 5a Cylinder head cooling water jacket 5b Cylinder head cooling water outlet 6 Thermostat valve case 7 Elbow pipe 8 Radiator 9 Cooling Water return line 10 Cooling water pump 13 Cooling water outflow line 14 Bypass passage 15 Thermostat valve 15a Valve seat plate of thermostat valve 16 Embossed portion 16a Vertical surface of embossed portion 17 Jiggle pin valve

Claims (1)

(57) [Claims] 1. A thermostat valve case is provided integrally with a longitudinal side of a cylinder block in a cylinder block, the axis of which is inclined with respect to a horizontal plane. A cooling water return line from a radiator is connected to the valve case, and the inside of the thermostat valve case communicates with a suction side of a cooling water pump that supplies cooling water to the cylinder block. A cooling water outflow line to the upper tank of the radiator is connected to the inside of the thermostat valve case, and when the temperature of the cooling water is low, the communication of the cooling water return line to the inside of the thermostat valve case is cut off. When the temperature of the cooling water is high, the cooling water return pipe is connected to the inside of the thermostat valve case. In a slant type internal combustion engine provided with a thermostat valve formed as described above, an embossed portion is provided on a valve seat plate of the thermostat valve so as to form a substantially vertical surface in a part of the embossed portion. Jiggle pin valve on the vertical surface,
A cooling device in a slant type internal combustion engine, wherein the cooling device is provided so as to penetrate the jiggle pin valve.