JP2005214269A - Thermostat type response valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple structure, to carry out assembly in a line as a subassembly, to singularly build in an engine, and to replace only a thermostat type response valve by removing it from a housing when carrying out parts replacement. <P>SOLUTION: An adapter ring 43 having a fastening pawl 45 with a bent portion 46 slanted such that a tip side protrudes toward an outer circumferential side is pressed and fit in an outer circumferential part of a flange 30. The thermostat type response valve is composed such that it is attached to a recessed part 49 for attachment of an inlet housing 41 via the adapter ring 43. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a thermostat type response valve, and in particular, is connected to a crossing position between a pipe line communicating with a radiator of an engine cooling pipe and a bypass pipe, and the cooling water is connected to the radiator and the bypass pipe according to the temperature. The present invention relates to a thermostat type response valve for switching and circulating.

  Conventionally, in a water-cooled engine, the engine and the radiator have to be connected to reduce the heat load of the engine, reduce the friction of the engine, save energy, reduce harmful substances in the exhaust gas, or clean the engine. And a system for controlling the temperature of the cooling water flowing into the water jacket of the engine is employed.

  In such a water-cooled engine cooling device, there are many advantages such as simple structure and low cost, and reliable operation, especially for switching the cooling water between the radiator and the bypass pipe. For this reason, thermostat valves using expansion and solidification of wax are widely used. A thermostat valve having such a wax expansion type heat sensitive part is disclosed in, for example, Japanese Patent Application Laid-Open No. 51-13036.

  When assembling such a thermostat type response valve into an automobile engine, etc., it takes skill to install the mounting position and angle uniformly, depending on the type and size of the engine. The assembly is quite cumbersome. For these reasons, in recent years, a thermostat type response valve has been assembled into a cover or case in a sub-assembled state to form an assembly part, and such a part has been assembled in the engine assembly line according to the mounting hole of the engine. However, the mounting position and angle can be easily assembled without fail. Therefore, such assembly parts are becoming a line system.

  A conventional thermostat type response valve integrally incorporated in the housing in this way is shown, for example, in FIGS. That is, a pair of support pieces 51 are integrally provided at the lower portion of the inlet housing 50 that also serves as a connecting pipe line with the radiator, as shown in FIGS. 14 and 15, and a spring receiving plate 52 is attached via these support pieces 51. The lower end of the compression coil spring 53 is received by the spring receiving plate 52. The spring 53 biases the support 54 upward, and the valve body 55 attached to the support 54 is pressed against the valve seat 56 of the inlet housing 50 to close the flow path.

  A cylindrical case 60 is arranged inside the compression coil spring 53 so that the upper end is supported by the support 54, and the case 60 is filled with wax 61 and the spool 62 is inserted into the wax 61. ing. A rod 63 is inserted into the spool 62, and the upper portion of the rod 63 is received by a recess 64 formed on the lower surface inside the inlet housing 50. A rod 65 is in contact with the lower portion of the case 60, and a conical spring 66 attached to the rod 65 pushes the valve body 67. The valve body 67 is configured to close an inlet 69 connected to the bypass pipe of the outlet housing 68.

  When the temperature of the cooling water passing through the housings 50 and 68 is low, the wax 61 in the case 60 is solidified, so that the valve is passed through the support 54 by the compression coil spring 53 as shown in FIG. The body 55 is crimped to the valve seat 56 to close the flow path, and the cooling water flows back from the bypass line to the water pump side through the inlet 69.

  On the other hand, when the temperature of the cooling water in the housings 50 and 68 rises, the wax 61 in the case 60 flows and the spool 62 squeezes the rod 63 so that the rod 63 moves upward and hits the recess 64. Touch. Then, the case 60 is moved downward by the reaction force, and thereby the case 60 is moved downward via the support body 54. Accordingly, the valve body 55 is separated from the valve seat 56, and the valve is opened. It is. Therefore, when the temperature of the cooling water rises, the amount of cooling water flowing from the bypass pipe to the water pump decreases, and the amount of cooling water flowing from the radiator to the water pump increases.

  Such a thermostat type response valve has a structure in which it is integrally assembled with an injection molded inlet housing 50. That is, the support piece 51 is formed integrally with the spring receiving plate 52 that receives the compression coil spring 53 in the lower part of the injection molded housing 50 from the side. Therefore, when the mounting angle or the like changes, the mounting hole or the like of the inlet housing 50 must be changed. Compared to the case of metal, the plastic housing has a larger support piece 51 in terms of strength, which disturbs the flow of cooling water.

  Therefore, there is a limit to increasing the strength of the support piece 51 of the housing 50. The cooling water that circulates in the interior rises to a temperature exceeding 100 ° C. at a high temperature and becomes 10 ° C. or less at a low temperature. The housings 50 and 68 directly receive such a temperature change of the cooling water. Accordingly, there is a problem that the housings 50 and 68 are distorted due to repeated temperature changes and the dimensional stability thereof is lowered, which causes a lack of reliability. In addition, depending on the type of vehicle to be assembled, the size of the engine, and the like, the types of housings 50 and 68 increase depending on the orientation and position of the housing 50, which increases the cost of the cooling device.

  This is because the thermostat type response valve is integrally incorporated in the housings 50 and 68 as described above, and is usually incorporated in the inlet housing 50 in this case. When the housing 50 is made of a plastic injection-molded product or an aluminum alloy die-cast, a molding die for die-molding the housing 50 or 68 or a die-casting mold is used according to the type of vehicle or engine. It must be prepared individually, which further increases costs.

  In addition, the conventional thermostat type response valve can be assembled using stainless steel as the main material. However, especially when assembled to the housing 50 made of plastic parts, there is anxiety in the assembly technology, thermal strength between members, distortion, etc. There is a problem that cannot be guaranteed for a long time.

  In addition, according to such a configuration, when the thermostat type response valve breaks down and it becomes necessary to replace parts, not only the thermostat type response valve but also the inlet incorporating this response valve is integrated. The plastic molded body such as the housing 50 or the aluminum alloy casting must be exchanged together. Therefore, if a malfunction of the thermostat type response valve occurs, it must be replaced together with the surrounding parts in the assembled state, which increases the repair cost for replacement and increases the number of parts to be replaced. Create a burden.

Further, such a thermostat type response valve has a problem that the control temperature varies depending on the position of the winding start portion of the compression coil spring 53 that biases the valve body 55 upward. That is, at the start of the combined cooling state when the engine is shifted from the warm-up state to the combined cooling state, the position where the valve body 55 starts to open due to the terminal position of the compression coil spring 53 and the biased load of the spring 53 is the circumference. The position where the valve bodies 54 of the individual response valves start to open is different, and the position where the cooling water flows is different, which causes a problem in that the control temperature of the engine cooling water varies.
Japanese Patent Laid-Open No. 51-13036

  An object of the present invention is to provide a thermostat type response valve that is easy to assemble and that is not integrated into a housing or the like and that only its components can be replaced.

  Another object of the present invention is to provide a thermostat type response valve that has a simple structure and is inexpensive, can be assembled in a line as a subassembly, and can be removed from the housing when replacing parts. It is.

  Another object of the present invention is to provide a thermostat type response valve that improves versatility and can be widely applied regardless of the type of vehicle or the type of engine.

  Still another object of the present invention is to provide a thermostat type response valve that does not use plastic parts that are easily deformed by a cycle of temperature change, thereby greatly improving reliability and having versatility. .

  Still another object of the present invention is to provide a thermostat type response valve that does not rotate after being mounted, thereby preventing the position of the air vent valve from changing.

  The above-mentioned problems and other problems of the present invention will be made clear by the technical idea of the present invention and the embodiments of the invention described below.

The main invention of the present application is connected to the intersection of the bypass pipe and the pipe communicating with the radiator of the engine cooling pipe, and the cooling water is switched between the radiator and the bypass pipe according to the temperature and circulated. In thermostat type response valve,
The present invention relates to a thermostat type response valve comprising an adapter ring having a locking claw on an outer peripheral portion, being mounted on a mounting recess of the housing via the adapter ring, and being locked by the locking claw. is there.

  Here, the adapter ring is made of an elastic material, and the locking claw may have its tip end bent in a direction opposite to the mounting direction. In addition, the locking claw may be bent obliquely at an inclination angle of 3 to 15 degrees with respect to the mounting direction so as to protrude from the base portion of the bent portion on the tip side to the outer peripheral side. Further, at the joint portion between the housing constituting the conduit communicating with the radiator and the housing constituting the conduit connected to the bypass conduit, the adapter ring is inserted into the concave portion of the housing constituting the conduit communicating with the radiator. May be installed.

  A preferred embodiment of the present invention is a thermostat that is used in an engine cooling device that circulates cooling water between an inside of an engine cooling jacket and a radiator, and performs switching of the cooling water between the radiator and a bypass line. In this type of response valve, an adapter ring provided with a plurality of locking claws in the circumferential direction is attached to the outer periphery of the rising portion of the flange of the thermostat type response valve. It is composed of an elastic material bent within a range of 3 to 15 degrees with respect to the direction, and the thermostat type response valve is mounted at the mounting position of the recess of the housing through such an adapter ring. is there.

  Therefore, the thermostat type response valve can be assembled into the mounting recess of the housing through such an adapter ring to make an assembly part, and the thermostat type response valve can be directly connected to the mounting recess of the housing at the engine assembly stage. It becomes possible to install via. In addition, when a malfunction occurs in the thermostat type response valve, it is only necessary to replace this response valve, and it is not necessary to replace the housing together, thereby suppressing an increase in the cost of parts when replacing parts. It becomes possible.

  The main invention of the present application is connected to the intersection of the bypass pipe and the pipe communicating with the radiator of the engine cooling pipe, and circulates the cooling water by switching between the radiator and the bypass pipe according to the temperature. In the thermostat type response valve, an adapter ring having a locking claw is provided on the outer periphery, and the adapter ring is mounted on the mounting recess of the housing via the adapter ring and locked by the locking claw.

  Therefore, according to such a thermostat type response valve, since the adapter ring having the locking claw is provided on the outer peripheral portion, the adapter ring is inserted into the concave portion for mounting of the housing through the adapter ring. Easy to install. The thermostat type response valve can be integrated with the housing to be an assembly part, and the thermostat type response valve can be easily and reliably incorporated in the assembly line. Further, when replacing the parts, only the thermostat type response valve needs to be replaced, and for example, waste of a plastic housing is not generated.

  The present invention will be described below with reference to embodiments shown in the drawings. 1 and 2 show an outline of an engine cooling device using such a thermostat type response valve 15, and the engine 10 and the radiator 11 are connected to each other via main cooling pipes A and B. FIG. At the same time, the outlet side of the radiator 11 is connected to the water jacket of the engine 10 via return lines C, E, and F. And the bypass line D is connected to the connection point of the lines C and E, and the thermostat type response valve 15 is connected to the intersection of these three lines C, D, and E. The radiator 11 constitutes a heat exchanger, and the cooling water circulating inside is cooled by a cooling fan 13. Further, a water pump 12 is connected to the downstream side of the thermostat type response valve 15 so as to forcibly circulate the cooling water.

  As described above, the engine cooling device of the present embodiment is for cooling the water-cooled engine 10, and the radiator 11, the cooling fan 13, the water pump 12, and the cooling water are bypassed during the warm-up operation. The thermostat type response valve 15 is connected to the intersection of the radiator 11, the water pump 12 of the engine 10 and the bypass line D.

  Next, the configuration of the thermostat type response valve 15 will be described with reference to FIGS. 3 to 6 and FIG. As shown in FIGS. 4 to 6, the thermostat type response valve includes a frame 25 bent in a substantially U shape (see FIG. 8), and a case 26 is disposed inside the frame 25. As shown in FIG. 5, the case 26 is filled with wax 27 and a spool 28 is inserted therein. Then, the lower end of the rod 29 is inserted into the spool 28. The upper end of the rod 29 is received by the recess 32 of the bridge 31 of the flange 30.

  A support body 33 having a substantially disk shape is provided at the upper end of the case 26, and a rubber valve body 34 is attached to the outer periphery of the support body 33. A compression coil spring 35 is disposed between the support 33 and the case 26.

  A rod 36 projects from the lower end of the case 26, and a conical spring 37 is interposed on the outer periphery. The spring 37 presses the valve body 38 downward. The valve body 34 closes the inlet 39 of the outlet housing 42 shown in FIG.

  As shown in FIG. 3, such a thermostat type response valve is attached to a joint portion between a pair of upper and lower housings 41 and 42 at the flange 30 portion. Moreover, the adapter ring 43 is used for such attachment.

  Next, an adapter ring 43 for mounting such a thermostat type response valve in the recess 49 on the lower surface of the inlet housing 41 will be described. The adapter ring 43 is made of stainless steel, and has a large circular opening 44 at its substantially central portion as shown in FIGS. 9 to 11, and protrudes radially outward from the outer peripheral portion of the adapter ring 43. A locking claw 45 is provided continuously. A portion on the distal end side of the locking claw 45 is bent downward to constitute a bent portion. Here, the angle of inclination of the bent portion 46 with respect to the insertion direction of the adapter ring 43 or the axis is within a range of 3 to 15 degrees, and the bent portion 46 is closer to the tip side portion than the root side portion. Protrudes outward in the radial direction.

  Such an adapter ring 43 is fitted to the outer peripheral surface of the flange 30 by press fitting, as shown in FIGS. As shown in FIG. 3, the thermostat type response valve is mounted on the mounting recess 49 formed of a circular recess formed on the lower surface of the joint portion of the inlet housing 41 via the adapter ring 43. ing. At this time, the locking claw 45 on the outer peripheral side of the adapter ring 43 is pressed against the outer peripheral surface of the recess 49, thereby preventing the thermostat type response valve from falling off.

  Next, the switching operation of such a thermostat type response valve will be described. When the temperature of the cooling water is low, the wax 27 in the case 26 is solidified as shown in FIG. 3, so that the spool 28 does not squeeze out the rod 29. The valve body 34 on the outer peripheral side of the support 33 is pressed against the valve seat on the lower surface of the flange 30 to close the flow path from the radiator 11. Accordingly, the cooling water flows from the bypass pipe D through the inlet 39 into the outlet housing 42 and flows to the water pump 12 side.

  When the temperature of the cooling water rises, the wax 27 in the case 26 is fluidized, whereby the spool 28 pushes out the rod 29. Accordingly, the rod 29 abuts against the concave portion 32 of the bridge 31 and the reaction force causes the valve body 34 to move downward against the compression coil spring 35 via the case 26 and the support 33. Therefore, this thermostat type response valve is opened. Accordingly, the cooling water flows from the radiator 11 into the inlet housing 41, and this cooling water is mixed with the cooling water that has entered from the bypass pipe D through the inlet 39 and flows toward the water pump 12.

  As the temperature of the cooling water rises, the opening degree of the thermostat type response valve increases, and the gap between the valve body 38 and the inlet 39 gradually decreases, whereby the cooling water that circulates through the bypass pipe D. The amount decreases, and the cooling water cooled by the radiator 11 flows to the water pump 12 side.

  In such a thermostat type response valve, the adapter ring 43 is attached to the outer peripheral surface of the rising portion of the flange 30. Here, the adapter ring 43 is provided with eight locking claws 45 on the outer peripheral portion at intervals of 45 degrees, and these locking claws 45 are configured to fold back the tip side portion, and the folding angle is 3 to 3. It is within the range of 15 degrees (see FIG. 10). The number of the locking claws 45 and the position in the circumferential direction can be variously changed according to the dimensions and mounting position of the thermostat type response valve.

  Then, the engaging claw 45 having the bent portion 46 at the tip end portion is attached to the attaching concave portion 49 of the inlet housing 41 via the adapter ring 43. For example, as shown in FIG. 12, it is inserted and fixed in a state where packing is mounted on the outer peripheral portion of the flange 30 in the mounting recess 49 of the inlet housing 41 of an aluminum alloy die-cast or plastic injection molded body.

  At this time, as shown in FIGS. 7 and 9, the mounting position of the air vent valve 48 is determined and fitted. When the injection molded inlet housing 41 is attached to the engine 10, the air vent valve 48 must always be installed on the upper side even if the mounting location, position, and angle thereof are changed. This is because when air is mixed in the cooling device of the engine 10 or when cooling water is injected for the first time after the assembly of the engine is completed, this cooling pipe is automatically used when the engine 10 or the vehicle body shakes. This is because air that has entered the road is drawn upward through the air vent hole 47 shown in FIG. 7, and must be positioned on the upper side. For example, as shown in FIG. 2, when the axis of the thermostat type response valve is mounted in a horizontal state, it is incorporated so that the position of the air vent valve 48 shown in FIG. 4 is directly above.

  According to the thermostat type response valve of the present embodiment as described above, when the thermostat type response valve is inserted into the mounting recess 49 of the aluminum die cast or plastic inlet housing 41 as shown in FIG. The adapter ring 43 is easily mounted by the inclination of the tip end portion of the locking claw 45. That is, the latching claw 45 is attached so as to be inclined so that the distal end portion of the bent portion 46 is on the outer peripheral side in the radial direction as shown in FIG. It is easily inserted by inserting 45 bent portions 46. Moreover, once inserted, the locking claw 45 cannot be easily removed by the spring force of the portion protruding from the distal end side to the outer peripheral side. Further, the thermostat type response valve cannot be rotated, so that the rotational position of the air vent valve 48 is not changed. Even if there is only one kind of aluminum die-cast or plastic inlet housing 41, the mounting angle and the like can be arbitrarily determined by the mounting method at the time of insertion.

  According to such a configuration, the thermostat type response valve can be made of stainless steel, in particular, the main part including the frame 51, whereby high reliability can be exhibited. In addition, when the thermostat type response valve itself has a problem, it is only necessary to remove this response valve. That is, the response valve can be easily replaced by pulling it downward together with the adapter ring from the mounting recess 49 of the inlet housing 41. Therefore, the inlet housing 41 is not changed during replacement. Accordingly, it is possible to satisfy the requirements of the assembly line that requires the sub-assembled parts without significant structural changes in terms of cost and structure.

  Although the present invention has been described with reference to the illustrated embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea of the invention included in the present application. For example, in the above embodiment, the adapter ring 43 is mounted on the rising portion of the outer peripheral surface of the flange 30 of the thermostat type response valve, and is mounted on the mounting recess 49 of the inlet housing 41 via the adapter ring 43. However, the attachment position of the adapter ring 43 may be a position opposite to the above-described configuration with respect to the flange 30. It is also possible to mount the thermostat type response valve in the mounting recess formed in the outlet housing 42 via the adapter ring 43.

  The present invention can be widely used for cooling devices for engines composed of various water-cooled internal combustion engines.

It is a block diagram which shows the structure of the whole cooling device of an engine. It is a piping diagram of the cooling device. It is a longitudinal cross-sectional view of the housing incorporating the thermostat type response valve. It is a top view of a thermostat type response valve. It is a longitudinal cross-sectional view of a thermostat type response valve. It is a side view of a thermostat type response valve. It is the sectional view on the AA line in FIG. 4 which shows an air vent valve, and the BB sectional drawing in FIG. 7A. It is a disassembled perspective view of the principal part of a thermostat type response valve. It is a top view of an adapter ring. It is a longitudinal cross-sectional view of the adapter ring. It is an external appearance perspective view of an adapter ring. It is a longitudinal cross-sectional view of the inlet housing incorporating the thermostat type response valve. It is a top view of the conventional inlet housing which integrated the thermostat type response valve integrally. It is the same front view. It is the longitudinal cross-sectional view. It is sectional drawing of the state which combined the inlet housing and outlet housing which integrated the thermostat type response valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Engine 11 Radiator 12 Water pump 13 Cooling fan 15 Thermostat type response valve 25 Frame 26 Case 27 Wax 28 Spool 29 Rod 30 Flange (valve seat)
DESCRIPTION OF SYMBOLS 31 Bridge 32 Recess 33 Support body 34 Valve body 35 Compression coil spring 36 Rod 37 Conical spring 38 Valve body 39 Inlet 41 Inlet housing 42 Outlet housing 43 Adapter ring 44 Circular opening 45 Locking claw 46 Bending portion 47 Air vent hole 48 Air vent valve 49 Recess 50 for mounting 50 Inlet housing 51 Support piece 52 Spring receiving plate 53 Compression coil spring 54 Support 55 Valve body 56 Valve seat 60 Case 61 Wax 62 Spool 63 Rod 64 Recess 65 Rod 66 Conical spring 67 Valve body 68 Outlet Housing 69 entrance

Claims (4)

In the thermostat type response valve that is connected to the intersection of the bypass line and the pipe line communicating with the radiator of the engine cooling pipe line, and circulates the cooling water by switching between the radiator and the bypass pipe line according to the temperature.
A thermostat type response valve comprising an adapter ring having a locking claw on an outer peripheral portion, mounted on the mounting recess of the housing via the adapter ring, and locked by the locking claw.   2. The thermostat type response valve according to claim 1, wherein the adapter ring is made of an elastic material, and a tip end portion of the locking claw is bent in a direction opposite to a mounting direction.   The locking claw is bent obliquely at an inclination angle of 3 to 15 degrees with respect to the mounting direction so as to protrude outward from the base portion of the bent portion on the tip side. The described thermostat type response valve. In a joint portion between the housing constituting the pipe line communicating with the radiator and the housing constituting the pipe line connected to the bypass pipe line, the concave portion of the housing constituting the pipe line communicating with the radiator is interposed via the adapter ring. The thermostat type response valve according to claim 1, which is mounted.

Images