JP2005180461A - Thermo valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce oil passing resistance of a thermo valve disposed in a lubricating oil circulating device of an internal combustion engine. <P>SOLUTION: In a thermo valve 4, a cylindrical valve element 7 having an oil passing hole 5f at the bottom and a spring 8 pressing the cylindrical valve element 7 are provided in the interior of a cylindrical valve case 5 provided with a stay 5a fitted with a thermo element 6 incorporated with a thermally actuated member 6a to which a rod 6b is connected. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a thermovalve in an oil lubrication system that reduces the pipe resistance of lubricating oil in an internal combustion engine.

  In general, the lubricating oil of an internal combustion engine is sucked out by an oil pump from an oil pan, the hydraulic pressure is adjusted by a pressure regulating valve, and supplied to each rotating part and each sliding part through the lubricating oil circulation pipe. In addition, the wear of each sliding portion and the like is reduced and cooled and washed, and then returned to the oil pan. With the recent improvement in performance of internal combustion engines, the rotation speed of internal combustion engines has increased, and there is a tendency to bring about an increase in the required amount of lubricating oil and a higher lubricating oil temperature. For this reason, a multi-tube or plate-type oil cooler is installed in the middle of the lubricating oil circulation pipe so that the lubricating oil temperature is appropriate. Since the required heat exchange performance of the oil cooler is set by the number of tubes and the number of plates, the heat exchange performance is generally sufficient. However, by installing an oil cooler, the oil viscosity is high when the oil temperature is low, such as when the engine is started, and therefore the pipeline resistance of the lubricating oil is increased, resulting in a decrease in the oil amount. Friction at each sliding portion increases, causing phenomena such as deterioration of engine fuel consumption and generation of abnormal noise. Therefore, as described in Patent Document 1 and Patent Document 2, which will be described later, when the oil temperature is low, such as when the engine is started, the oil is not circulated to the oil cooler, but the oil is switched to a pipeline that bypasses the oil cooler. I am doing so. For such switching of the pipe line, a thermo valve to which a thermo element with a built-in thermoresponsive member is attached is used.

Japanese Utility Model Publication No. 7-38854 Japanese Patent Laid-Open No. 10-30420

  However, in the oil lubrication system in which the thermo valve is arranged in this manner, it is effective to reduce the resistance of the lubricating oil pipe line by bypassing the oil cooler when the lubricating oil is cold, but the temperature of the lubricating oil is low. Until it is higher than the set value and switches to the pipe to the oil cooler, the thermo valve having a complicated configuration is affected by the oil flow resistance of the thermo valve itself against the increase in the amount of lubricating oil accompanying the temperature rise of the lubricating oil. As a result, the resistance of the lubricating oil pipe is increased, and a problem arises in that a predetermined amount of oil cannot be secured in each rotating part or each sliding part.

  The thermo valve according to the present invention has a bottom wall at one end and a stair at the other end, an annular first partition rib at the other end of the side wall, and an annular second partition rib at the center of the side wall. A cup-shaped valve case is formed in a cylindrical valve case in which an oil outflow window is formed on the side wall between the first partition rib and the second partition rib, and a bypass outflow window is formed on the bottom wall side wall of the first partition rib. In the thermo valve in which the valve body is positioned so that the bottom wall of the valve body is located on the stay side of the valve case, and a spring is disposed between the bottom wall inner surface of the valve body and the bottom wall inner surface of the valve case, A thermo valve characterized in that a relief hole is provided in the bottom wall of the valve case.

  The thermo valve of the present invention has a relief hole in the bottom wall of the valve case of the thermo valve. By flowing lubricating oil from the relief hole in the bottom wall of the valve case, the passage of the thermo valve is increased accordingly. It has become so. As a result, oil resistance generated in the thermo valve can be reduced without increasing the number of components and increasing the size of the thermo valve. Furthermore, since a relief hole is provided in the bottom wall of the valve case that has blocked the inside of the valve case and the oil passage, the valve element that slides inside the valve case of the thermo valve when the thermo element is activated, When moving against the spring, bubbles of lubricating oil or air intervening between the valve body and the bottom wall of the valve case are pushed out through a relief hole provided in the bottom wall of the valve case, The back pressure generated by the compressed lubricating oil or air bubbles between the bottom of the cylindrical body can be reduced, and sticking and chattering of the valve body can be prevented.

  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in FIGS.

  FIG. 1 shows a cross-sectional view of a thermo valve 4 of the present invention, and FIG. 2 shows a perspective view of a valve body 7 disposed inside the thermo valve 4. 3 and 4 are longitudinal sectional views showing a state in which the thermo valve of the present invention is arranged in the circuit of the oil lubrication system. FIG. 3 is a view when the oil temperature is low, that is, the oil temperature does not reach the predetermined temperature. FIG. 4 shows a state where the oil temperature is high, that is, the oil temperature has risen to a predetermined temperature.

  In FIG. 1, the thermo valve 4 is provided with a disc-shaped seat 9 forming a bottom wall at one end, and a stay 5a straddling the side wall at the other end, and the valve case 5 has an annular first partition at the other end of the side wall. An annular second partition rib 5c is provided at the center of the rib 5b and the side wall, and a lubricating oil outlet window 5d is equidistantly spaced from the side wall of the valve case 5 between the first partition rib 5b and the second partition rib 5c. And four bypass outlet windows 5e are formed at equal intervals on the side wall of the valve case 5 on the bottom wall side wall of the second partition rib 5c. The outer diameter of the second partition rib 5c is the first partition rib. It is smaller than the outer diameter of 5b. The pipe line in which the thermo valve 4 is disposed has the largest lubricating oil inflow portion 1 (first stage), the smallest diameter lubricating oil bypass outflow portion 3 (third stage), The first partition rib 5b is held at the first step and the second partition rib 5c is held at the second step. The outer diameter of the valve case 5 on the bottom wall (seat 9) side is smaller than the inner diameter of the lubricating oil bypass outlet 3, and a gap through which the lubricating oil flows is formed. A thermo element 6 having a built-in heat response member 6a to which a rod 6b is connected is fixed to a flange portion formed at the center portion of a stay 5a provided in the valve case 5, and the rod 6b is a center portion of the stay 5a. It protrudes into the valve case 5 through a hole formed in. The inner diameter of the inner wall of the valve case 5 is formed in two stages, and an annular groove 5h is formed in the inner wall on the bottom wall side having a large inner diameter. The bottom wall of the cup-shaped valve body 7 having an outer diameter approximately the same as the inner diameter of the valve case 5 is held at the step of the inner wall of the valve case 5, and the end surface of the valve body 7 is the rod of the thermo element 6. It is made to contact 6b. The inner surface of the bottom wall of the valve body 7 and the large diameter of the inner wall of the valve case 5 are formed with a relief hole 9a in the central part, and the central part is a disc-shaped sheet 9 that is convex toward the inside of the valve case 5. Between them, an umbrella-shaped coil spring 8 is disposed and fixed by a C-ring 10 seated in an annular groove 5h.

In the thermovalve 4 having the above-described configuration, when the oil temperature does not reach a predetermined temperature, the valve body 7 closes the lubricating oil outflow window 5d of the valve case 5, while the bypass outflow window 5e of the valve case 5 The lubricating oil which is opened and conveyed from the oil pump of the engine flows from the lubricating oil inflow portion 1 through an oil passage hole 5f formed between the stays 5a of the valve case 4, and the oil passage window on the bottom wall of the valve body 7 7a flows out from the bypass outflow window 5e of the valve case 4 and the relief hole 9a formed in the seat 9, and flows from the lubricating oil bypass outflow portion 3 to the oil filter or the like. For this reason, the passage of the thermo valve is increased. As a result, oil resistance generated in the thermo valve can be reduced without increasing the number of components and increasing the size of the thermo valve.

Further, in a state where the oil temperature has risen to a predetermined temperature, the thermoresponsive member 6a in the thermo element 6 expands, the rod 6b is pushed out, the valve body 7 is pushed down against the spring 8, and the lubricating oil outflow window 5d is opened. On the other hand, the bypass outflow window 5e of the valve case 5 is closed, and the lubricating oil conveyed from the engine oil pump flows from the lubricating passage inlet 1 through the oil passage hole 5f of the stay 5a of the valve case 4 and flows out of the lubricating oil. The oil flows from the lubricating oil outlet 2 to the oil cooler through the window 5d. In this case, since the relief hole 9a is formed in the seat 9, a part of the lubricating oil passes through the oil passage window 7a on the bottom wall of the valve body 7 and also flows out from the relief hole 9a. To the oil filter. For this reason, the passage in the thermo valve is increased, and as a result, the oil resistance generated in the thermo valve can be reduced.

  Further, in a state where the oil temperature has risen to a predetermined temperature, when the heat-responsive member 6a in the thermo element 6 expands, the rod 6b is pushed out and the valve body 7 is pushed down against the spring 8, the valve Since the lubricating oil or air bubbles interposed between the body 7 and the seat 9 are pushed out through the relief holes 9a formed in the seat 9, the lubricating oil compressed between the valve body 7 and the seat 9 Back pressure generated by air bubbles can be reduced, and sticking and chattering of the valve body 6 can be prevented.

In addition, in the said Example, although the sheet | seat 9 which forms the bottom wall of the valve case 5 is formed separately from other parts, the bottom wall is formed integrally with the side wall, and the stay 5a part is separated. You may make it. In the above embodiment, an umbrella-shaped coil spring having a tapered outer diameter is used as the spring 8 disposed between the valve body 7 and the valve case 5. However, a coil having the same outer diameter is used. A spring may be used.

Sectional drawing which shows the Example of this invention. The perspective view of the valve body which concerns on this invention. Sectional drawing in the state in which the oil temperature of this invention has not reached predetermined temperature. The sectional view in the state where oil temperature of the present invention rose to predetermined temperature.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Lubricating oil inflow part 2 ... Lubricating oil outflow part 3 ... Lubricating oil bypass outflow part 4 ... Thermo valve 5 ... Valve case 5a ... Stay 5b ... 1st partition rib 5c ... 2nd partition rib 5d ... Lubricant oil outflow window 5e ... Bypass outflow window 6 ... Thermo element 7 ... Valve body 8 ... Spring 9 ... Seat 9a ... Relief hole 10 ... C-ring

Claims (1)

  A bottom wall is provided at one end, a stay is provided at the other end, an annular first partition rib is provided at the other end of the side wall, an annular second partition rib is provided at the center of the side wall, and the first partition rib and the second partition are provided. A cup-like valve body is placed in the bottom wall of the valve body in a cylindrical valve case in which a lubricating oil outflow window is formed on the side wall between the ribs and a bypass outflow window is formed on the side wall of the first partition rib. In a thermo valve in which a spring is disposed between the inner surface of the bottom wall of the valve body and the inner surface of the bottom wall of the valve case, a relief hole is formed in the bottom wall of the valve case. Thermo valve characterized by providing.

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