JP4150628B2 - Water-cooled engine thermostat housing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thermostat housing for a water-cooled engine.
[0002]
[Prior art]
Conventionally, as shown in FIGS. 4 (C) to (E), a thermostat housing for a water-cooled engine is provided with a thermostat accommodation chamber (51) at the top of the housing and an inlet chamber (52) at the bottom of the housing, as in the present invention. A lower passage (53) extending in the vertical direction is provided between the thermostat storage chamber (51) and the inlet chamber (52), and the side extending along the vertical direction is located beside the thermostat storage chamber (51) and the lower passage (53). There is a series of floating passages (54) which are connected to the inlet chamber (52) below the side floating passages (54) and the thermostat (51) accommodates the thermostat (55).
[0003]
In this prior art, as shown in FIG. 4C, the upper end of the side floating passage (54) is covered with the housing ceiling wall (71), and the upper boundary between the side floating passage (54) and the thermostat accommodation chamber (51). Thus, as shown in FIG. 4D, a partition wall (73) extending in the front-rear direction from the screw boss (72) to the housing front wall (62) is suspended from the housing ceiling wall (71). Moreover, as shown in FIG.4 (C), the partition wall (77) long in the left-right direction which divides the whole between the entrance chamber (52) and the downward channel | path (53) is formed. Further, as shown in FIG. 4B, the rear surface of the housing is opened as a rear opening (74), and a rear opening flange (75) surrounding the rear opening (74) is provided on the rear surface of the housing. As shown in (D) and (E), a lid plate (76) is attached to the rear opening flange (75), and an inlet (60) facing the inlet chamber (52) is opened below the lid plate (76). Yes.
[0004]
The reason why the long partition wall 73 can be formed in the front-rear direction is that, as shown in FIG. 4D, it reaches the housing front wall 62 before the screw boss 72 as shown in FIG. This is because the meat remains. The reason why the long partition wall (77) is formed in the left-right direction is as follows. As shown in FIG. 4 (B), since the rear opening flange (75) surrounds the large rear opening (74) with the entire rear surface of the housing open, the strength of the rear opening flange (75) tends to be insufficient. Sealing between the rear opening flange (75) and the cover plate (76) tends to be insufficient. Therefore, in order to secure the strength of the rear opening flange (75), as shown in FIG. 4B, a partition wall (77) that is long in the left-right direction is provided between the lower passage (53) and the inlet chamber (52). It is provided and is continuous with the rear opening flange (75).
[0005]
[Problems to be solved by the invention]
The above prior art has the following problems.
<Problem 1> The inflow of cooling water from the upper part of the side floating passage into the thermostat chamber receives resistance.
As shown in FIG. 4 (C), the upper end of the side floating passage (54) is covered with the housing ceiling wall (71), and at the upper boundary between the side floating passage (54) and the thermostat storage chamber (51), FIG. As shown to D), the partition wall (73) long in the front-back direction from the screw boss (72) to the housing front wall (62) is suspended from the housing ceiling wall (71). For this reason, as shown in FIG. 4C, the inflow of the cooling water from the upper part of the side floating passage (54) into the thermostat storage chamber (51) is subjected to the resistance of the partition wall (73) long in the front-rear direction. The cooling water flow becomes worse and the cooling efficiency is lowered.
[0006]
<Problem 2> The inflow of cooling water from the entrance chamber to the lower passage receives resistance.
As shown in FIG. 4 (C), a partition wall (77) that is long in the left-right direction is formed to partition the entire area between the inlet chamber (52) and the lower passage (53). For this reason, as shown in FIGS. 4C and 4E, the inflow of cooling water from the inlet chamber (52) to the lower passage (53) is resisted by the amount that bypasses the partition wall (77) that is long in the left-right direction. As a result, the flow of the cooling water becomes worse and the cooling efficiency is lowered.
[0007]
<< Problem 3 >> There is a risk of water leakage during overload operation.
As shown in FIG. 4 (B), the rear surface of the housing is opened as a rear opening (74), and a rear opening flange (75) surrounding the rear opening (74) is provided on the rear surface of the housing. As shown in (E), a cover plate (76) is attached to the rear opening flange (75). The rear opening flange (75) is large and easily distorted. Therefore, if the overload operation is continued for a long time, thermal distortion occurs and there is a risk of water leakage.
[0008]
The subject of this invention is providing the thermostat housing of the water cooling engine which can solve the said problem.
[0009]
[Means for Solving the Problems]
(Invention of Claim 1)
Invention specific matters of the invention of claim 1 are as follows.
As shown in FIGS. 1C to 1E, a thermostat accommodation chamber (1) is provided in the upper part of the housing, and an inlet chamber (2) is provided in the lower part of the housing. The thermostat accommodation room (1), the inlet chamber (2), A lower passage (3) along the vertical direction is provided between the two, and a series of side floating passages (4) along the vertical direction are provided alongside the thermostat housing chamber (1) and the lower passage (3). In a thermostat housing of a water-cooled engine, wherein (4) is communicated with the lower inlet chamber (2), and the thermostat (5) is accommodated in the thermostat accommodating chamber (1).
As shown in FIG. 1 (A), the upper end of the thermostat chamber (1) and the upper end of the side floating passage (4) are opened in series as the upper opening (6) at the upper end of the housing, An upper opening flange (7) surrounding the opening (6) is provided, and as shown in FIG. 1 (C), a thermostat flange (8) protruding from the thermostat (5) is seated on the upper opening flange (7). A thermostat housing for a water-cooled engine, characterized in that, of the upper opening (6), the opening at the upper end of the side floating passage (4) is covered with a thermostat flange (8).
[0010]
(Invention of Claim 2)
Invention specific matters of the invention of claim 2 are as follows.
The thermostat housing of the water-cooled engine according to claim 1,
As shown in FIG. 1 (B), the space above the entrance chamber (2) is surrounded by a cylindrical portion (9) along the vertical direction, and the entrance (10) is opened at the back of the entrance chamber (2). An inlet flange (11) surrounding the inlet (10) is provided on the back of the inlet chamber, and as shown in FIG. 1 (E), the inlet chamber (2) is interposed between the inlet flange (11) and the front wall (12) of the housing. ) And the lower passage (3) are provided with a floating communication port (13).
[0011]
(Invention of Claim 3)
Invention specific matters of the invention of claim 3 are as follows.
The thermostat housing for a water-cooled engine according to claim 2,
As shown in FIG. 1 (D), the inlet flange (11) and the housing front wall (12) are connected by a reinforcing wall (14) erected in the front-rear direction, and as shown in FIG. A thermostat housing for a water-cooled engine, wherein the floating communication port (13) is provided beside the wall (14).
[0012]
【The invention's effect】
(Invention of Claim 1)
The invention of claim 1 has the following effects.
<Effect 1> The cooling water can smoothly flow into the thermostat chamber from the upper side of the side floating passage.
As shown in FIG. 1 (C), the upper opening (6) of the side floating passage (4) is covered with the thermostat flange (8) at the upper end, and the thermostat flange (8) There is no room for forming a long partition wall in the front-rear direction as in the prior art, and it is formed flat. For this reason, the flow of the cooling water from the upper part of the side floating passage (4) into the thermostat housing chamber (1) is smooth, the flow of the cooling water is improved, and the cooling efficiency is high.
[0013]
(Invention of Claim 2)
In addition to the effect of the invention of claim 1, the invention of claim 2 has the following effect.
<Effect 2> Coolant water flows smoothly from the entrance chamber to the lower passage.
As shown in FIG. 1 (E), a floating communication port (13) is provided between the inlet flange (11) and the housing front wall (12) for communicating the inlet chamber (2) and the lower passage (3). Therefore, the cooling water flows smoothly from the inlet chamber (2) into the lower passage (3), the flow of the cooling water is improved, and the cooling efficiency is high.
[0014]
<Effect 3> Water leakage is difficult even during overload operation.
As shown in FIG. 1 (B), the space above the inlet chamber (2) is surrounded by a cylindrical portion (9) extending in the vertical direction, so that it is difficult to leak from the top. Further, as shown in FIG. 1B, an inlet flange (11) is provided on the back surface of the inlet chamber (2) so that the inlet (10) is opened and the inlet chamber (2) is surrounded by the inlet (10). The inlet flange (11) is small and is not easily distorted. For this reason, even if the overload operation is continued for a long time, thermal distortion hardly occurs, and water does not easily leak from the lower part.
[0015]
(Invention of Claim 3)
The invention of claim 3 has the following effect in addition to the effect of the invention of claim 1 or claim 2.
<< Effect 4 >> The strength of the inlet flange can be increased.
As shown in FIG. 1 (D), the inlet flange (11) and the housing front wall (12) are connected by the reinforcing wall (14) installed in the front-rear direction, so that the strength of the inlet flange (11) can be increased. it can.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
1-3 is a figure explaining the thermostat housing of the water cooling engine which concerns on embodiment of this invention. In this embodiment, a bottom bypass thermostat housing will be described.
[0017]
The structure of the water-cooled engine with the thermostat housing attached is as follows.
As shown in FIG. 3, the cylinder head (16) is assembled to the upper part of the cylinder block (23), the oil pan (24) is assembled to the lower part of the cylinder block (23), and the gear case ( 25) and a head cover (26) is assembled to the upper part of the cylinder head (16). A cylinder jacket (22) is provided inside the cylinder block (23), a head jacket (17) is provided inside the cylinder head (16), and a water pump (21) is attached to the gear case (25). A thermostat housing (15) is attached to the front surface of the cylinder head (16). A thermostat (5) is accommodated in the thermostat housing (15), a main pipe (27) is attached to the upper part of the thermostat housing (15), and a bypass passage (20) is provided in the lower part of the thermostat housing (15). Yes. The main pipe (27) communicates with a radiator (not shown) via a hot water outlet hose (not shown), and the bypass passage (20) communicates with a water pump (21) via a bypass tube (not shown). . The thermostat (5) includes a main valve (18) at the upper part and a sub valve (19) at the lower part.
[0018]
The function of this water-cooled engine is as follows.
While the cooling water temperature in the head jacket (17) is low, the function of the thermostat (5) keeps the main valve (18) closed and the sub valve (19) kept open. For this reason, during the warm-up operation of the engine, the cooling water in the hedge jacket (17) is sucked into the water pump (21) from the bypass passage (20), and is pumped to the cylinder jacket (22). ) To the head jacket (17). For this reason, the cooling water circulates without passing through the radiator (not shown), and the temperature of the cooling water is rapidly increased. When the cooling water temperature in the head jacket (17) increases, the function of the thermostat (5) maintains the main valve (18) in the open state and the sub valve (19) in the closed state. Therefore, after the engine is warmed up, the cooling water in the head jacket (17) is sucked into the water pump (21) from the main pipe (27) through the radiator (not shown), and the cylinder jacket (22). To the head jacket (17) from the cylinder jacket (22). For this reason, the cooling water circulates through the radiator (not shown), and heat is radiated quickly.
[0019]
The outline of the thermostat housing is as follows.
As shown in FIGS. 1C to 1E, a thermostat accommodation chamber (1) is provided in the upper part of the housing, and an inlet chamber (2) is provided in the lower part of the housing. The thermostat accommodation room (1), the inlet chamber (2), A lower passage (3) along the vertical direction is provided between the two, and a series of side floating passages (4) along the vertical direction are provided alongside the thermostat housing chamber (1) and the lower passage (3). (4) communicates with the lower inlet chamber (2), and the thermostat (5) is accommodated in the thermostat accommodating chamber (1). As shown in FIG. 1 (E), the lower passage (3) is formed behind the bypass passage (20). As shown in FIG. 1 (A), a main pipe (27) is seated on the upper opening flange (7) of the upper portion of the thermostat housing (15) with a thermostat housing (8) to be described later interposed therebetween. ) Are screwed to the three screw bosses (28), (29) and (30) shown in FIG.
[0020]
The characteristics of the thermostat housing are as follows.
As shown in FIG. 1 (A), the upper end of the thermostat chamber (1) and the upper end of the side floating passage (4) are opened in series as the upper opening (6) at the upper end of the housing, An upper opening flange (7) surrounding the opening (6) is provided, and as shown in FIG. 1 (C), a thermostat flange (8) protruding from the thermostat (5) is seated on the upper opening flange (7). In the upper opening (6), the opening at the upper end of the side floating passage (4) is covered with the thermostat flange (8). Reference numerals (31) and (32) in FIG. 1 (C) are communication openings, for example, connecting a connecting pipe with a heat exchanger for cabin heating of a tractor. When not connecting, it is sealed with a plug.
[0021]
As shown in FIG. 1 (B), the space above the entrance chamber (2) is surrounded by a cylindrical portion (9) along the vertical direction, and the entrance (10) is opened at the back of the entrance chamber (2). An inlet flange (11) surrounding the inlet (10) is provided on the back of the inlet chamber, and as shown in FIG. 1 (E), the inlet chamber (2) is interposed between the inlet flange (11) and the front wall (12) of the housing. ) And the lower passage (3) are provided with a floating communication port (13).
[0022]
As shown in FIG. 1 (D), the inlet flange (11) and the housing front wall (12) are connected by a reinforcing wall (14) erected in the front-rear direction, and as shown in FIG. The floating communication port (13) is provided on the side of the wall (14).
[0023]
The functions according to the above features are as follows.
As shown in FIG. 1 (C), the upper opening (6) of the side floating passage (4) is covered with the thermostat flange (8) at the upper end, and the thermostat flange (8) There is no room for a long partition wall to be formed in the front-rear direction as in the prior art, and this can be formed flat. For this reason, the flow of the cooling water from the upper part of the side floating passage (4) into the thermostat housing chamber (1) is smooth, the flow of the cooling water is improved, and the cooling efficiency is high. In addition, as shown in FIG. 1 (E), a floating communication port (13) for communicating the inlet chamber (2) and the lower passage (3) between the inlet flange (11) and the front wall (12) of the housing. Therefore, the cooling water can smoothly flow from the inlet chamber (2) into the lower passage (3), the flow of the cooling water is improved, and the cooling efficiency is high.
[0024]
As shown in FIG. 1 (B), the space above the inlet chamber (2) is surrounded by a cylindrical portion (9) extending in the vertical direction, so that it is difficult to leak from the top. Further, as shown in FIG. 1B, an inlet flange (11) is provided on the back surface of the inlet chamber (2) so that the inlet (10) is opened and the inlet chamber (2) is surrounded by the inlet (10). The inlet flange (11) is small and is not easily distorted. For this reason, even if the overload operation is continued for a long time, thermal distortion hardly occurs, and water does not easily leak from the lower part. Further, as shown in FIG. 1 (D), the inlet flange (11) and the housing front wall (12) are connected by the reinforcing wall (14) installed in the front-rear direction, so that the strength of the inlet flange (11) is increased. be able to. The thermostat housing (15) is made of aluminum die cast and can be formed by punching up and down and later.
[Brief description of the drawings]
1A and 1B are diagrams for explaining a thermostat housing of a water-cooled engine according to an embodiment of the present invention. FIG. 1A is a plan view, FIG. 1B is a rear view, and FIG. ) Is a cross-sectional view taken along the line CC of FIG. 1, FIG. 1D is a cross-sectional view taken along the line DD of FIG. 1B, and FIG. 1E is a cross-sectional view taken along the line EE of FIG.
2A and 2B are diagrams illustrating a thermostat housing of a water-cooled engine according to an embodiment of the present invention, FIG. 2A is a left side view, FIG. 2B is a front view, and FIG. 2C is a right side view. It is.
FIG. 3 is a front longitudinal sectional side view of a water-cooled engine to which the thermostat housing of FIG. 1 is attached.
4A and 4B are views for explaining a thermostat housing of a water-cooled engine according to the prior art, in which FIG. 4A is a plan view, FIG. 4B is a rear view, and FIG. 4C is C in FIG. 4C is a cross-sectional view taken along the line D-D in FIG. 4B, and FIG. 4E is a cross-sectional view taken along the line E-E in FIG. 4B.
[Explanation of symbols]
(1) ... Thermostat accommodation room, (2) ... Entrance room, (3) ... Lower passage, (4) ... Floating passage, (5) ... Thermostat, (6) ... Upper opening, (7) ... Upper opening flange , (8) ... Thermostat flange, (9) ... Cylindrical part, (10) ... Inlet, (11) ... Inlet flange, (12) ... Front wall of housing, (13) ... Floating communication port, (14) ... Reinforcement wall.

Claims (3)

A thermostat housing chamber (1) is provided in the upper part of the housing, an inlet chamber (2) is provided in the lower part of the housing, and a lower passage (3) extending in the vertical direction is provided between the thermostat housing room (1) and the inlet chamber (2). A series of side levitation passages (4) along the vertical direction are provided alongside the thermostat accommodation chamber (1) and the lower passage (3), and the side levitation passage (4) communicates with the lower inlet chamber (2). A water-cooled engine thermostat housing in which the thermostat (5) is housed in the thermostat housing chamber (1).
Upper end flange of thermostat accommodation chamber (1) and upper end of side floating passage (4) are opened in series as upper opening (6) at the upper end of housing and upper opening (6) is surrounded at the upper end of housing (7) is provided, and the thermostat flange (8) overhanging from the thermostat (5) is seated on the upper opening flange (7), and the upper opening (6) has an upper end of the side floating passage (4). A thermostat housing for a water-cooled engine, characterized in that the opening is covered with a thermostat flange (8). The thermostat housing of the water-cooled engine according to claim 1,
A space above the entrance chamber (2) is surrounded by a cylindrical portion (9) extending in the vertical direction, the entrance (10) is opened at the back of the entrance chamber (2), and the entrance (10) is placed at the back of the entrance chamber. An enclosing inlet flange (11) is provided, and a floating communication port (13) is provided between the inlet flange (11) and the front wall (12) of the housing to communicate the inlet chamber (2) and the lower passage (3). A thermostat housing for a water-cooled engine. The thermostat housing for a water-cooled engine according to claim 2,
The inlet flange (11) and the housing front wall (12) are connected by a reinforcing wall (14) installed in the front-rear direction, and the floating communication port (13) is provided on the side of the reinforcing wall (14). Features a water-cooled engine thermostat housing.

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