JP5238214B2 - Temperature-sensitive valve device - Google Patents

Description

  The present invention relates to a temperature-sensitive valve device, and more particularly, to a temperature-sensitive valve device that opens and closes according to temperature or controls the opening amount of a valve body.

  In order to prevent the temperature of an engine composed of an internal combustion engine of an automobile from rising abnormally, a water-cooled cooling device has conventionally been used that circulates cooling water between a water jacket of a cylinder block of an engine and a radiator. Widely used. In order to switch the circulation between the cooling water radiator and the bypass pipe in such a water-cooled cooling device, a temperature-sensitive valve device has been widely used conventionally.

  Such a valve device is arranged in a cooling water flow environment as disclosed in JP-A-2005-98153, JP-A-2005-127217, JP-A-2005-214269, and the like. The temperature sensitive case is filled with a temperature sensitive substance, and a rod is further inserted into the spool inserted into the case from the opening end side of the temperature sensitive case, so that the temperature rises and the temperature sensitive substance expands. When the spool is squeezed and the rod is pushed out, the tip end portion of this rod is brought into contact with the fixed contact portion, and the valve body is pushed away from the valve seat by the reaction force at that time. The valve opening operation is performed.

Here, the conventional temperature-sensitive valve device is provided with a spring for pressure-bonding the valve body against the valve seat, and the valve body is moved to the spring using the reaction force of the rod pushed out by the spool. The opening of the valve element is adjusted by the balance between the spring and the reaction force of the rod. The opening amount of the valve body with respect to the temperature of such a conventional temperature-sensitive valve device, that is, the lift characteristic is a characteristic indicated by a dotted line in FIG. 6 or FIG.
JP 2005-98153 A JP 2005-127217 A JP-A-2005-214269

  An object of the present invention is to provide a temperature-sensitive valve device in which an opening amount or a lift characteristic with respect to a temperature change is changed according to the purpose.

  Another object of the present invention is to provide a second spring for pressing the valve opening rod in the reverse direction in addition to the first spring for crimping the valve body to the valve seat. Thus, it is to provide a temperature-sensitive valve device in which the opening amount or the characteristics of the lift are changed.

  Still another object of the present invention is to provide a temperature-sensitive valve device that absorbs an initial stroke at a low temperature and changes the valve opening temperature to a high temperature side.

  Yet another problem of the present invention is to absorb the overstroke of the valve body when the temperature further rises in the fully open state, and keeps the opening amount constant after reaching a predetermined opening amount. A temperature-sensitive valve device is provided.

  The above-described problems and other problems of the present invention will be clarified by the technical idea of the present invention and the embodiments thereof described below.

The main invention of the present application includes a first valve body disposed so as to be able to contact and separate from a valve seat,
A first spring that presses the first valve body and presses the first valve body against the valve seat;
A temperature-sensitive case provided on the first valve body and filled with a temperature-sensitive substance;
When the spool inserted into the temperature sensitive case is squeezed by the temperature sensitive substance, the spool is pushed out and the tip part comes into contact with the fixed side contact part. A rod that opens against the spring of 1,
A second spring that presses against the tip of the rod against the abutting portion on the fixed side;
I have a,
The elastic restoring force of the second spring is set larger than the elastic restoring force of the first spring, and the first valve body is opened apart from the valve seat by the elastic deformation of the first spring. The present invention relates to a temperature-sensitive valve device in which an overstroke is absorbed when the second spring is elastically deformed in a state where it is in a closed state .

Here, the cap shape in which the second spring that presses against the abutting portion of the rod against the abutting portion on the fixed side is fitted and held in the hole of the abutting portion on the stationary side. May be received by a spring receiver. The abutment portion on the fixed side may be provided on an arm connected to a frame including the valve seat. Together with collision of the tip of receiving said cap-like spring into the small holes formed in an intermediate portion of the arm is fitted, the leading end portion of the second spring to the tubular portion of larger diameter than the projecting portion May be accepted. The rod is slidably supported by a through-hole formed in the lid of the temperature sensing case, and is connected to the spool in a state where the rod is coupled to the lid. The end side may be inserted. A second valve element may be attached to the end of the temperature sensitive case opposite to the end where the rod is pushed out. The second valve body may be slidably attached to a support member attached to an end of the temperature sensitive case, and may be urged by a third spring to close the opening of the casing. Further, the circulation of the engine coolant may be switched according to the temperature of the coolant.

  The main invention of the present application includes a first valve body disposed so as to be able to contact and separate from the valve seat, a first spring that presses the first valve body and press-fits the valve seat, A temperature sensing case filled with a temperature sensitive substance and a spool inserted into the temperature sensitive case are pushed out when the temperature sensitive substance is squeezed out, and the tip is brought into contact with the fixed side A rod that abuts and opens the first valve body against the first spring by the reaction force, and a second spring that presses against the abutting portion of the rod against the abutting portion on the fixed side And so on.

  Therefore, according to such a temperature-sensitive valve device, the first spring of the temperature-sensitive valve device is particularly provided by the second spring that presses against the abutting portion of the rod against the abutting portion on the fixed side. The stroke or lift of the valve body can be changed. When the elastic restoring force of the first spring is larger than the elastic restoring force of the second spring, the initial stroke is absorbed and the timing for opening the first valve body is shifted to the high temperature side. On the other hand, if the elastic restoring force of the second spring is set larger than the elastic restoring force of the first spring, even if the temperature further rises after the second valve body is completely opened, the opening amount is further increased. Overstroke is absorbed without increasing.

  The present invention will be described below with reference to embodiments shown in the drawings. 1 and 2 show a temperature-sensitive valve device according to a first embodiment. This temperature-sensitive valve device includes a ring-shaped frame 10 that is circular and disc-shaped when viewed from above. Yes. A circular opening 11 is formed in the center side of the ring-shaped frame 10, and a lower edge portion of the opening 11 serves as a valve seat 12 (see FIG. 2). A first valve body 13 made of a rubber ring is disposed so as to be able to contact and separate from the valve seat 12. The first valve body 13 is fixedly attached to the outer peripheral portion of the mounting plate 14.

  A temperature-sensitive actuator for pressing and separating the first valve body 13 with respect to the valve seat 12 will be described. This temperature-sensitive actuator includes a bottomed temperature-sensitive case 18 having a cylindrical shape, and the temperature-sensitive case 18 is filled with a temperature-sensitive substance 19 that expands and contracts according to an external temperature. A spool 20 is inserted into the temperature sensitive case 18 filled with the temperature sensitive substance 19 from the upper opening. A rod 21 is inserted into the spool 20 so as to protrude further upward. The rod 21 passes through a through hole 23 formed in the axial direction at the center of a small disc-shaped lid 22 that closes the upper opening of the temperature sensitive case 18. A pair of upper and lower O-rings 24 are attached to a recess formed on the inner peripheral surface of the through hole 23 of the lid 22 so as to seal between the outer peripheral portion of the rod 21 and the through hole 23 of the lid 22. Yes. A presser ring 25 is further mounted on the upper O-ring 24.

  A retaining ring 28 is attached to the upper end portion of the rod 21 protruding from the lid 22 of the temperature sensitive case 18, and a spring receiver 29 is disposed on the outer periphery of the rod 21 above the retaining ring 28. It is slidably fitted and its lower surface is received by a retaining ring 28. The spring receiver 29 receives the lower end portion of the second spring 30 attached to the outer peripheral portion of the rod 21. A portion on the upper end side of the second spring 30 is received by a cap-shaped spring receiver 31. The cap-shaped spring receiver 31 is fitted in a small hole 33 of an arm 32 provided so as to straddle the circular opening 11 of the ring-shaped frame 10, and is pressed by the arm 32.

  A U-shaped bracket 36 having an open side surface is attached to the lower side of the ring-shaped frame 10, and the upper locking pieces 37 on both sides of the bracket 36 are engaged with the small holes of the ring-shaped frame 10. Combined and installed. A first spring 38 is disposed inside the bracket 36, and a portion on the upper end side of the first spring 38 presses the lower surface of the mounting plate 14. That is, the first spring 38 urges the first valve body 13 to be pressed against the valve seat 12 via the mounting plate 14.

  A rod-like support member 41 is attached to the lower end portion of the temperature sensitive case 18 so as to protrude downward. A frustoconical third spring 42 is disposed on the outer peripheral portion of the support member 41. The third spring 42 presses the upper surface of the second valve body 43 that is slidably held by the support member 41. The second valve body 43 is slidably supported by the support member 41, and a lower end thereof is received by a retaining ring 44 attached to the support member 41, whereby the second valve body 43 is received. 43 is prevented from falling off the support member 41.

  As shown in FIG. 2, such a temperature-sensitive valve device is arranged in a housing 50 connected to a circulation pipe for cooling engine cooling water. A cap 51 is coupled to the upper portion of the housing 50, and a holding recess 52 formed at the edge of the opening of the housing 50 at a joint portion between the housing 50 and the cap 51 has an outer periphery of the ring-shaped frame 10. The rubber ring 53 on the side is held, and the temperature-sensitive valve device is attached and fixed to the joint portion between the housing 50 and the cap 51 through the rubber ring 53.

  An inlet port 55 is formed in the cap 51 so as to open upward. In contrast, an outlet port 56 is formed on the side of the housing 50. A bypass opening 57 is formed at the bottom of the housing 50. The water jacket of the cylinder block of the engine 61 is connected to a radiator 62 connected to a cooling water circulation circuit, and a pipe line on the outlet side of the radiator 62 is connected to an inlet port 55 of the cap 51. The inlet side portion of the water pump 63 is connected to the outlet port 56 of the housing 50. A bypass pipe line from the cylinder block of the engine 61 is connected to the bypass opening 57.

  Here, when the temperature of the cooling water of the engine 61 is high, the temperature-sensitive valve device is opened. For this reason, the cooling water of the engine 61 is cooled by the radiator 62 and then the temperature-sensitive valve. It flows from the inlet port 55 of the apparatus to the outlet port 56 and returns to the cylinder block of the engine 61 again by the water pump 63. By performing such a circulation, the cooling water whose temperature has risen can be radiated by the radiator 62 to lower the temperature (see FIG. 5).

  On the other hand, when the temperature of the cooling water of the engine is low, the first valve body 13 of this temperature-sensitive valve device is crimped to the valve seat 12 and closed as shown in FIGS. Therefore, the cooling water of the engine 61 does not circulate in the radiator 62 but enters the housing 50 of the temperature-sensitive valve device from the bypass opening 57 through the bypass pipe, and then is introduced from the outlet port 56 to the water pump 63. Then, the engine 61 returns to the cylinder block. That is, when the temperature of the cooling water of the engine 61 is low, it is not cooled by the radiator 62 but is circulated through the bypass pipe to prevent overcooling.

  Next, the operation of the temperature sensitive valve device according to the first embodiment will be described. In this temperature-sensitive valve device, the elastic restoring force of the first spring 38 is set to a larger value than the elastic restoring force of the second spring 30. By setting the elastic restoring force of the springs 38 and 30 as described above, the initial stroke of the rod 21 is absorbed, and the characteristic indicated by the dotted line in FIG. 6 is changed to the characteristic indicated by the solid line. The valve opening or lift characteristics with respect to temperature are improved.

  When the temperature of the cooling water of the engine is low, since the temperature sensitive substance 19 in the temperature sensitive case 18 is not expanded, the rod 21 inserted into the spool 20 is pushed upward as shown in FIG. Absent. Therefore, there is a gap corresponding to a predetermined initial stroke between the rod 21 and the receiving surface of the cap-shaped spring receiver 31.

  When the temperature of the cooling water of the engine rises in such a state, the temperature sensitive material 19 in the temperature sensitive case 18 expands, and for this reason, the spool 20 is throttled by the temperature sensitive material 19. Therefore, the rod 21 is pushed upward as shown in FIG. At this time, since the rod 21 is pushed downward by the second spring 30 attached to the upper end side thereof, the rod 21 rises while compressing the second spring 30, and the upper end of the rod 21 and the cap shape It moves so as to eliminate the gap between the spring receiver 31.

  Until the rod 21 and the cap-shaped spring receiver 31 come into contact with each other, the rod 21 does not exert a pressing force on the arm 32 holding the cap-shaped spring receiver 31. Will not receive any reaction force. Therefore, in this initial lift state, no lift occurs with respect to the temperature change on the low temperature side indicated by A in FIG. That is, until the temperature corresponding to A, the initial stroke of the rod 21 is absorbed, and the first valve body 13 is maintained in a state of being crimped to the valve seat 12. Therefore, at the initial stroke stage, the temperature-sensitive valve device remains closed.

  When the temperature of the cooling water of the engine further rises, as shown in FIG. 5, the temperature sensitive substance 19 in the temperature sensitive case 18 further expands, so that the spool 20 squeezes the rod 21 and thereby the rod 21 moves upward. Extruded to a large extent. The upper end of the rod 21 completely crushes the second spring 30 and presses the arm 32 via the cap-shaped spring receiver 31. Here, since the arm 32 is fixed, the rod 21 conversely presses the temperature sensitive case 18 downward by the reaction force from the arm 32. Accordingly, the first valve body 13 on the outer peripheral side of the mounting plate 14 coupled to the temperature sensitive case 18 moves downward as shown in FIG. 5, and the first valve body 13 is moved from the valve seat 12. Separate. This opens the temperature sensitive valve device. Then, the cooling water that has entered from the inlet port 55 flows to the outlet port 56, thereby establishing a circulation line for the cooling water that passes through the radiator 62.

  When the predetermined temperature is reached, the second valve body 43 attached to the support member 41 on the lower end side of the temperature sensitive case 18 closes the bypass opening 57 of the housing 50. Cooling water no longer circulates in the bypass line. Thereafter, the third spring 42 is compressed, and the third spring 42 applies an upward biasing force to the temperature sensing case 18, and therefore, a resistance force against the downward reaction force of the rod 21. Will increase. At point B in FIG. 6, the movement amount of the lift with respect to the temperature becomes gentle due to the expansion of the temperature sensitive substance 19 in the temperature sensitive case 18 as the temperature rises. Thereafter, as the temperature rises, the temperature sensitive substance 19 in the temperature sensitive case 18 expands, and the rod 21 further pushes the rod 21, so that the rod 21 moves the temperature sensitive case 18 by the reaction force from the arm 32. The downward movement of the temperature sensing case 18 is performed against the sum of the elastic restoring forces of the first spring 38 and the third spring 42. For this reason, the lift changes with temperature. As shown in FIG.

  Therefore, the temperature-sensitive valve device of the present embodiment has characteristics as shown in FIG. The feature of this characteristic is that the initial stroke is absorbed and the position at which the valve opening operation is started is on the high temperature side and shifts to point A. In the subsequent valve opening operation, the movement amount of the first valve element 13 with respect to the temperature change becomes a steep characteristic, particularly in the section from A to B. Therefore, the sensitivity of the valve opening operation with respect to a change in temperature is improved.

  Next, a second embodiment will be described with reference to FIGS. In this embodiment, the second spring 30 is constituted by a hard spring obtained by forming a ribbon-shaped steel plate into a coil shape, and the elastic restoring force of the plate spring 30 is a first spring in which a wire is wound in a coil shape. A value larger than the elastic restoring force of 38 is set. Further, here, the elastic restoring force of the third spring 42 is set to a value larger than the elastic restoring force of the second spring 30. With such a spring setting, the characteristic indicated by the dotted line in FIG. 10 can be improved to the characteristic indicated by the solid line.

  When the temperature is low, as shown in FIG. 7, the temperature sensitive substance 19 in the temperature sensitive case 18 is contracted, and the spool 20 does not squeeze out the rod 21. Therefore, the rod 21 is almost housed in the spool 20, and the first valve body 13 is not pressed downward by the reaction force that the rod 21 receives from the arm 32. Accordingly, the first valve body 13 is maintained in a state where it is pressed against the valve seat 12. This keeps the temperature sensitive valve device closed.

  When the temperature of the cooling water of the engine rises, as shown in FIG. 8, the temperature sensitive substance 19 in the temperature sensitive case 18 expands, the spool 20 is throttled, and the rod 21 is pushed upward. At this time, since the elastic restoring force of the second spring 30 is set larger than the elastic restoring force of the first spring 38, the second spring 30 does not contract here. Accordingly, the pressing force accompanying the upward movement of the rod 21 is transmitted to the arm 32 via the retaining ring 28, the spring receiver 29, the second spring 30, and the cap-shaped spring receiver 31. On the contrary, the fixed arm 32 applies a downward force to the rod 21 via the cap-shaped spring receiver 31, the second spring 30, the lower spring receiver 29, and the retaining ring 28. Therefore, the rod 21 lowers the temperature sensing case 18 by this force. Accordingly, the first valve body 13 attached to the temperature sensitive case 18 via the attachment plate 14 is separated from the valve seat 12, and the temperature sensitive valve device is opened.

  Therefore, the engine coolant enters the inlet port 55 and circulates so as to exit to the outlet port 56, passes through the radiator, and the cooling action by the radiator acts.

  When the temperature of the cooling water of the engine rises to a predetermined temperature and the temperature sensitive case 18 is pressed downward by the rod 21, the second attached to the support member 41 on the lower end side of the temperature sensitive case 18 will eventually be obtained. The valve body 43 closes the bypass opening 57 of the housing 50. As a result, the circulation of the cooling water through the bypass line is stopped.

  When the temperature of the cooling water further rises, as shown in FIG. 9, the second spring 30 is elastically deformed to perform an operation for absorbing the overstroke. That is, when the second valve body 43 pressed downward by the third spring 42 is moved to a position where the bypass opening 57 of the housing 50 is closed, the second valve body 43 is pressed downward. The elastic restoring force of the third spring 42 biases the temperature sensitive case 18 upward. Accordingly, the temperature sensitive case 18 is pushed upward by the sum of the elastic restoring force of the first spring 38 and the elastic restoring force of the third spring 42. Here, since the sum of the elastic restoring forces of the two springs 38 and 42 is set to a value larger than the elastic restoring force of the upper second spring 30, the temperature sensitive case 18 may further drop. Absent.

  Therefore, when the temperature of the cooling water further rises and the temperature-sensitive substance 19 in the temperature-sensitive case 18 further expands, the rod 21 moves the second spring 30 through the retaining ring 28 and the lower spring receiver 29. Press to elastically deform. Therefore, thereafter, the overstroke is absorbed by the elastic deformation of the second spring 30 so as to close the gap between the upper end of the rod 21 and the cap-shaped spring receiver 31, and the temperature sensing case 18 and the first valve body 13 in the meantime are absorbed. The downward movement is stopped.

  Accordingly, as shown by the solid line in FIG. 10, when the temperature further rises from the point B, the lift or opening amount of the first valve body 13 of this temperature-sensitive valve device does not change. As a result, the overstroke of the valve body 13 when the temperature exceeds a predetermined temperature is absorbed, and the opening amount of the valve body after the temperature reaches the predetermined temperature is not increased. A device is obtained.

  Although the present invention has been described above 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 present invention. For example, various design changes are possible for the specific structure of the temperature-sensitive valve device in the above embodiment, the combination of components, and the like.

  The present invention can be used as a temperature-sensitive switching valve for switching engine coolant to a radiator and a bypass line, and can be used as a temperature-sensitive valve that is a main part of an engine cooling device.

It is an external appearance perspective view of the temperature-sensitive valve apparatus of 1st Embodiment. It is the longitudinal cross-sectional view. It is a longitudinal cross-sectional view which shows the operation | movement at normal temperature. It is a longitudinal cross-sectional view which shows the absorption operation | movement of an initial stage lift. It is a longitudinal cross-sectional view which shows valve opening operation | movement. It is a graph which shows the change of the lift with respect to temperature. It is a longitudinal cross-sectional view which shows the structure of the state at the normal temperature of the valve apparatus of 2nd Embodiment. It is a longitudinal cross-sectional view of the state which closed the opening for bypasses. It is a longitudinal cross-sectional view which shows the state which absorbs an overstroke. It is a longitudinal cross-sectional view which shows the change of the lift with respect to temperature.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ring-shaped frame 11 Circular opening 12 Valve seat 13 1st valve body (rubber ring)
DESCRIPTION OF SYMBOLS 14 Mounting plate 18 Temperature sensing case 19 Temperature sensitive substance 20 Spool 21 Rod 22 Lid body 23 Through-hole 24 O-ring 25 Presser ring 28 Retaining ring 29 Spring receiver 30 Second spring 31 Cap-shaped spring receiver 32 Arm 33 Small hole 36 Bracket 37 Locking piece 38 First spring 41 Support member 42 Third spring 43 Second valve body 44 Retaining ring 50 Housing 51 Cap 52 Holding recess 53 Rubber ring 55 Inlet port 56 Outlet port 57 Bypass opening 61 Engine 62 Radiator 63 Water pump

Claims (8)

A first valve body arranged so as to be able to contact and separate from the valve seat;
A first spring that presses the first valve body and presses the first valve body against the valve seat;
A temperature-sensitive case provided on the first valve body and filled with a temperature-sensitive substance;
When the spool inserted into the temperature sensitive case is squeezed by the temperature sensitive substance, the spool is pushed out and the tip part comes into contact with the fixed side contact part. A rod that opens against the spring of 1,
A second spring that presses against the tip of the rod against the abutting portion on the fixed side;
Have
The elastic restoring force of the second spring is set larger than the elastic restoring force of the first spring, and the first valve body is opened apart from the valve seat by the elastic deformation of the first spring. A temperature-sensitive valve device in which an overstroke is absorbed when the second spring is elastically deformed in a state of contact. A cap-shaped spring receiver in which the second spring that presses against the tip of the rod against the fixed-side contact portion is fitted and held in the hole of the fixed-side contact portion. The temperature-sensitive valve device according to claim 1, wherein the temperature-sensitive valve device is received by:   The temperature-sensitive valve device according to claim 2, wherein the abutting portion on the fixed side is provided on an arm provided continuously with a frame including the valve seat. With collision portion is fitted at the tip of receiving said cap-like spring into the small holes formed in an intermediate portion of the arm, the distal end portion of the second spring to the tubular portion of larger diameter than the projecting portion The temperature-sensitive valve device according to claim 3, wherein the temperature-sensitive valve device is received.   The rod is slidably supported by a through-hole formed in the lid of the temperature sensing case, and is coupled to the lid and inserted into the temperature sensing case in a base end of the rod The temperature-sensitive valve device according to claim 3, wherein the side is inserted.   The temperature-sensitive valve device according to claim 5, wherein a second valve body is attached to an end portion of the temperature-sensitive case opposite to an end portion to which the rod is pushed out.   The second valve body is slidably attached to a support member attached to an end of the temperature sensitive case, and is urged to close the opening of the casing by a third spring. The temperature-sensitive valve device according to claim 6.   The temperature-sensitive valve device according to claim 1, wherein circulation of engine cooling water is switched according to a temperature of the cooling water.

Images