JPH04121425U - engine thermostat device - Google Patents

Abstract

(57) [Summary] [Purpose] When the thermostat device is placed horizontally due to the arrangement of the engine and attached equipment, this prevents air from accumulating inside the thermostat device and stabilizes the flow rate of cooling water. Plan. [Structure] A first cooling water inlet communicating with the Schillinghend cooling water chamber is provided at one end, a second cooling water inlet communicating with the radiator cooling water outlet tank at the other end, and further comprising a first cooling water inlet communicating with the radiator cooling water outlet tank; A casing having a cooling water outlet that communicates with a pump chamber of a water pump provided in the middle of the cooling water inlet via a bypass passage, and a cooling water outlet formed between the first cooling water inlet and the cooling water outlet within the casing. a thermostatic device comprising: a valve seat section; a transversely placed temperature-responsive device for driving a valve member housed within the casing and cooperating with the valve seat section; A small-diameter air vent hole is provided to communicate the upper part of the inside of the casing with the first cooling water inlet.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a thermostat device for an engine, particularly for a vehicle engine such as a truck. It is something to do.

0002

[Conventional technology]

In conventional diesel engines for vehicles such as trucks, the cooling of the cylinder head is Displacement between the cooling water outlet, radiator, and water pump depending on the temperature of the cooling water A thermostatic device is provided having a valve member that is controlled. Same thermostat As is well known in the art, the device is used during cold engine operation when the cooling water temperature is low. In this case, the cylinder head and water pump can be connected without circulating cooling water to the radiator. The cooling water circulates between the pump and the crankcase to speed up warm-up and set the coolant temperature. If the temperature exceeds the specified value, drain the cooling water from the cylinder head through the radiator. It operates by circulating the oil through the data pump and into the crankcase. The above thermostat device includes a casing through which cooling water flows, and a casing in which cooling water flows. a temperature-responsive device that is housed in the housing and drives the valve member according to the cooling water temperature; In normal vehicle engines, the above thermostat device is installed in the cylinder. It is located above the front end of the head, and the temperature-responsive device mentioned above is arranged vertically. The valve member is provided so as to be driven in the vertical direction.

0003

[Problem that the idea aims to solve]

Diesel engines for vehicles, especially engines for cab-over trucks. In this case, the engine is located in a narrow space below the cab floor. The cab floor should be placed at a reasonably low level while ensuring minimum ground clearance. In this case, it is desirable to reduce the height of the front end of the engine. Move the Mostat device from a position above the frontmost end of the cylinder head to a low position on the side of the engine. It is advantageous to relocate it to However, the fuel injection port is located on the side of the engine. The pump, turbocharger, alternator, other auxiliary equipment, and attached parts are congested. Due to the layout constraints of the thermostat device, the temperature response device It may be necessary to arrange the device laterally. In a thermostat device in which the temperature-responsive device is placed horizontally as described above, the casing Air from the cooling water system may accumulate inside the casing, and if air accumulates inside the casing, , problems such as the flow rate of cooling water becoming unstable and the required engine cooling effect not being achieved. There is. The present invention is applicable to a thermostat device in which a temperature-responsive device as described above is installed horizontally. The desired engine cooling effect can be achieved by avoiding air stagnation inside the casing. The purpose of this invention is to provide such a configuration.

0004

[Means to solve the problem]

The engine thermostat device according to the present invention has one end for cooling the cylinder head. It has a first cooling water inlet communicating with the water chamber, and a cooling water outlet of the radiator at the other end. A second cooling water inlet communicating with the mouth side tank, and further including the first and second cooling water inlets. A case with a cooling water outlet located in the middle of the mouth and communicating with the pump chamber of the water pump. between the first cooling water inlet and the cooling water outlet in the same casing. The formed valve seat part is accommodated in the above casing and is lateralized depending on the temperature of the cooling water. A temperature-responsive device equipped with an output member that expands and contracts in the direction, and a temperature-responsive device equipped with an output member of the temperature-responsive device. The first cooling water inlet and the cooling water outlet cooperate with each other to control communication between the first cooling water inlet and the cooling water outlet. The valve member that controls the valve member and the upper part of the inside of the casing bypassing the valve seat part. It is characterized by being equipped with a small diameter air vent hole communicating with the first cooling water inlet. This paper proposes a thermostat device for an engine.

[0005]

[Effect]

According to the present invention, the temperature-responsive device is housed inside the casing, A small diameter air bypassing the valve seat is provided between the upper part and the first cooling water inlet. A vent hole is provided in the upper part of the casing to separate it from the cooling water. The raised air flows from the air vent hole to the outside of the thermostat through the first cooling water inlet. This prevents the cooling water flow rate from becoming unstable in the thermostat device. be done.

[0006]

【Example】

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The code 10 in the figure is the total The diesel engine for trucks is shown in general, and the engine is crankcase 1. 2, the cylinder head 14 mounted on the upper end of the crankcase 12, and the cylinder head 14 of the same cylinder and a rocker cover 16 attached to the upper end of the driver head 14. A timing gear device (not shown) is housed in the front end surface of the crankcase 12. The timing gear case 18 is installed, and the timing gear case 18 is A pump chamber 22 of the tapump 20 is integrally recessed. In the pump chamber 22 A propeller 24 is housed, and the shaft of the impeller 24, that is, the pump shaft 26 is connected via a pulley 28. It is driven in conjunction with the engine crankshaft (not shown). In front of pump room 22 The opening end is closed by a lid member 30 that rotatably supports the pump shaft 26. ing.

[0007] At the end of the crankcase adjacent to the water pump 20, there is a general reference numeral 32. The thermostat device 32 shown in FIG. A first casing 36a having a cooling water inlet 34 and a second casing 36a having a second cooling water inlet 38. The casing 36 includes two casings 36b. Inside the casing 36 The well-known wax pellet type temperature-responsive The motion device 42 is housed horizontally, and the rod-shaped output member 44 is made of a thin metal plate. A valve member 46 is mounted. The first casing 36a has bypass communication with the pump chamber 22 of the water pump. A cooling water outlet 50 is opened which communicates with the first cooling water inlet 34 via a passage 48. A valve seat portion 52 that cooperates with the valve member 46 is formed between the cooling water outlet 50 and the cooling water outlet 50. ing. In addition, the valve seat portion 52 is bypassed in the first casing 36a, and the valve seat portion 52 is bypassed. a small-diameter air vent hole 54 that communicates the uppermost space of the housing with the first cooling water inlet 34; is drilled. The first cooling water inlet 34 is connected to the cylinder head 14 through a bypass pipe 56. The cooling water chamber inside the cylinder head 14 is connected to the cooling water outlet pipe. Cooling water inlet side tank of the radiator 60 schematically shown in FIG. 2 via 58 It is connected to 62. The radiator 60 includes a heat exchange core 64 and a cooling water outlet tank. The cooling water outlet side tank 66 is connected to a thermostat via a cooling water conduit 68. It communicates with a second cooling water inlet 38 of the cut device 32.

[0008] In the above configuration, FIG. 1 shows a cold state operation in which the cooling water temperature of the engine 10 is lower than the set temperature. At this time, the output of the temperature responsive device 42 of the thermostat device 32 The member 44 is contracted and the valve member 46 is separated from the valve seat portion 52. Therefore, When the water pump 20 is driven by the operation of the engine 10, the impeller 24 Cooling water is pumped into the crankcase from the outlet 70 of the pump chamber 22 (see Fig. 2). 12, flows through the cooling water chamber in the cylinder head 14, and is bypassed. The pipe 56 enters the casing 36 through the first cooling water inlet 34, and the cooling water exits. It circulates from the port 50 to the pump chamber 22 via the bypass passage 48 . At this time, the flow resistance Because cooling water does not substantially flow through the radiator 60, which has a relatively large Cooling water is supplied to the water pump 20, crankcase 12, and cylinder head 14. Warm-up is performed rapidly by cycling between After a while, when the temperature of the engine cooling water reaches the set temperature, the temperature response device 42 The wax pellets undergo a phase change and increase in volume, and the output member 42 becomes as shown in FIG. The valve member 46 moves laterally to the right and comes into contact with the valve seat portion 52 and connects with the first cooling water inlet 34. Communication with the cooling water outlet 50 is cut off. As a result, cooling inside the cylinder head 14 Water enters the cooling water inlet side tank 62 of the radiator 60 from the commonly used cooling water outlet pipe 58. The cooling water is cooled while flowing through the heat exchange core 64 and flows out to the cooling water outlet side tank 66. . Furthermore, the cooling water flows from the outflow pipe 68 to the second cooling water inlet 38 of the thermostatic device 32. The water enters the casing 36 through the cooling water outlet 50 and passes through the bypass passage 48. It is sucked into the pump chamber 22 and fed under pressure into the crankcase 12 from the outlet 70. It circulates within the cylinder head 14 again. During operation of the engine 10, the air contained in the cooling water and the pipes of the cooling water circulation system Air leaking from connections etc. flows into the casing 36 of the thermostat device 32 However, a small diameter air vent hole 54 that bypasses the valve seat portion 52 is provided. The air collected in the upper part of the casing 36 is then passed through the air vent hole 54 to the bypass pipe. Flows into the cylinder head 14 through the pipe 52 and accumulates in the casing 36. There is no. Therefore, the cooling water generated by air remaining inside the casing 36 The advantage is that there are no problems that could lead to unstable flow rates or deterioration of engine cooling performance. . Note that the thermostat device 32 may be placed on the side of the engine as shown in the figure. The overall height of the engine is reduced by This allows for rational placement of numerous auxiliary equipment and accessories, including the fuel injection pump. There are advantages.

[0009]

[Effect of the idea]

As mentioned above, the engine thermostat device according to the present invention has a cylinder at one end. It has a first cooling water inlet that communicates with the cooling water chamber of the head, and a radiator at the other end. a second cooling water inlet communicating with the cooling water outlet side tank of the heater; Cooling water provided between the second cooling water inlet and the second cooling water inlet and communicating with the pump chamber of the water pump. A casing with an outlet, and a cooling water inlet and a cooling water inlet in the casing. The valve seat part formed between the water outlet and the cooling water housed in the casing. A temperature-responsive device with an output member that expands and contracts in the lateral direction depending on the temperature, and the same temperature-responsive device The first cooling water inlet and the cooling water outlet are connected to the first cooling water inlet and the cooling water outlet in cooperation with the valve seat part. A valve member that controls communication with the port and the casing bypassing the valve seat part. It is equipped with a small-diameter air vent hole that communicates the internal upper part with the first cooling water inlet. Due to the layout of the engine, attached auxiliary equipment, and parts, the engine When a thermostat device that controls the flow of cooling water depending on the temperature is installed horizontally. , prevents air from accumulating in the thermostat device and stabilizes the flow rate of cooling water. This is useful for practical purposes.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is a front view of the water pump in FIG. 1 with the impeller, pump shaft, and lid member removed.

FIG. 3 is an enlarged sectional view of the first casing of the thermostat device in FIG. 1;

[Explanation of symbols]

10 engine 12 Crank case 14 Cylinder head 20 Water pump 32 Thermostat device 60 radiator

Claims (1)

[Scope of utility model registration request] Claim 1: A first cooling water inlet communicating with a cooling water chamber of a cylinder head at one end, a second cooling water inlet communicating with a cooling water outlet side tank of a radiator at the other end, and further comprising: a first cooling water inlet communicating with a cooling water chamber of a cylinder head; A casing having a cooling water outlet provided between the first and second cooling water inlets and communicating with the pump chamber of the water pump, and a casing formed between the first cooling water inlet and the cooling water outlet within the casing. a temperature-responsive device including a valve seat portion, which is housed in the casing and expands and contracts in the lateral direction according to the temperature of the cooling water; a valve member that cooperates to control communication between the first cooling water inlet and the cooling water outlet; and a small-diameter air that bypasses the valve seat portion and communicates the upper part of the interior of the casing with the first cooling water inlet. An engine thermostat device, characterized in that it is equipped with an extraction hole.