JP2013144964A - Engine cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce electrical power required for positioning a sleeve valve body 82 of a switching valve 8 for switching flow paths of a coolant in an engine cooling device in which the coolant is allowed to independently flow through an inner-block water jacket 13 and an inner-head water jacket 14.SOLUTION: The switching valve 8 is a sliding-type valve housing the sleeve valve body 82 in a cylindrical cylinder chamber 81 so as to be only slidable along the central axis thereof. The coolant can be introduced into the inner-head water jacket 14 when the sleeve valve body 82 is actuated to slide on one side of the cylinder chamber 81 by an actuator 9, while the coolant can be introduced into the inner-block water jacket 13 when the sleeve valve body 82 is actuated to slide on the other side of the cylinder chamber 81 by the actuator 9.

Description

  The present invention relates to an engine cooling apparatus in which coolant can flow independently between a water jacket of a cylinder block and a water jacket of a cylinder head.

  For example, the conventional example shown in Patent Document 1 discloses a configuration in which coolant can be circulated independently of a water jacket of a cylinder block and a water jacket of a cylinder head.

  In this case, when the cold start is performed, it is possible to raise the temperature of the warm-up as quickly as possible by stopping the flow of the coolant to both the water jacket in the block and the water jacket in the head.

  In Patent Document 1, the cooling water discharged from the water jacket in the head and the water jacket in the block is circulated to the radiator and then returned to the water jacket, and the radiator is bypassed and then returned to the water jacket. A direction control valve for switching to the flow path is provided.

  This directional control valve is a so-called rotary valve, and a semi-cylindrical valve body is rotatably housed inside a cylindrical body provided with cooling water inlets and a plurality of outlets at several circumferential points. It has a configuration. In the case of this directional control valve, the valve body is rotated by an actuator (including a drive source such as a stepping motor and a power transmission mechanism such as a reduction gear) when the flow path is switched.

JP 2010-43555 A

  In the conventional example according to Patent Document 1, the coolant pressure by the water pump is applied to the rotary valve in such a form that the valve is rotated. Therefore, the valve body of the rotary valve is fixedly moved at the stop position. For this reason, there is a concern that the power consumption becomes large, for example, it is necessary to continue driving the actuator. Further, since the rotary valve is configured to be rotated by the actuator, a sensor for detecting the rotational position of the valve body is necessary for stop control during the rotary operation of the valve body of the rotary valve, and the engine There is a concern that the equipment cost of the cooling system increases.

  In view of such circumstances, the present invention provides a switching valve for switching a coolant flow path in an engine cooling device that allows coolant to flow independently between a water jacket of a cylinder block and a water jacket of a cylinder head. It is an object of the present invention to make it possible to reduce the power required for positioning the sleeve type valve body.

  An engine cooling device according to the present invention includes a switching valve for allowing a coolant to be introduced into a water jacket in a block or a water jacket in a head, and an actuator for operating the switching valve in accordance with a temperature change of the coolant. The switching valve is a slide type valve in which a sleeve type valve body is housed in a cylindrical cylinder chamber so as to be slidable along a central axis thereof, and the valve body is connected to one end of the cylinder chamber by the actuator. When the valve body is slid to the other end side of the cylinder chamber by the actuator, the water jacket in the block is brought into a state in which the coolant can be introduced into the water jacket in the head when being slid to the side. It is characterized in that the coolant can be introduced into the state.

  In this configuration, the coolant flow path can be switched so that the coolant can be introduced into the water jacket in the block or the water jacket in the head with a single switching valve.

  When the sleeve type valve element of the slide type valve as the switching valve is slid to one end side of the cylinder chamber, the coolant can be introduced into the water jacket in the head, while the other end side of the cylinder chamber When being slid, the coolant is introduced into the water jacket in the block.

  Further, the slide type valve as the switching valve has a configuration in which the sleeve type valve element is housed in the cylinder chamber so that it can only slide along the central axis at one end side and the other end side. For example, the valve body can be positioned by pressing it against one end side of the cylinder chamber with a reverse spring or the like.

  In that case, electric power for positioning the sleeve type valve element becomes unnecessary, and for the stop control during the sliding operation of the sleeve type valve element, for example, the rotation of the rotary valve of the conventional example shown in Patent Document 1 Compared to stop control during operation, it is simpler.

  Preferably, the switching valve may include a reverse spring for biasing the sleeve-type valve body so as to press it against one end side of the cylinder chamber.

  In this configuration, for example, the sleeve type valve element can be positioned so as to be pressed against one end side of the cylinder chamber by a reverse spring. Therefore, for example, as in the conventional example shown in Patent Document 1, the valve element of the rotary valve is fixed. There is no need to continue operating the actuator to position the actuator. As a result, power consumption for the positioning can be eliminated.

  Preferably, the actuator may be configured to include a thermo element whose overall length automatically increases as the temperature of the coolant increases as a drive source.

  In this configuration, a sensor for detecting the movement of the thermo element of the switching valve and a control system for operating the switching valve are not required, and thus the equipment cost can be reduced.

  Preferably, the switching valve is provided in the cylinder block in the vicinity of a coolant introduction portion provided in the cylinder block, and in the cylinder chamber of the changeover valve, an inner end opening of the coolant introduction portion, The upstream opening of the communication passage to the water jacket in the block and the upstream opening of the communication passage to the water jacket in the head are each opened, the sleeve-type valve body is penetrated at both ends in the axial direction, and the peripheral wall includes An inlet that communicates with the inner end opening of the coolant introduction portion and communicates with the inner end opening of the coolant introduction portion while being slid to one end of the cylinder chamber, and a head side outlet that communicates with the upstream opening of the head side communication passage are provided. And a block which is slid to the other end of the cylinder chamber and communicates with the upstream opening of the block side communication passage. Side outlet is provided, it can be configured.

  Here, the installation location of the switching valve is specified, and the configurations of the cylinder chamber and the sleeve type valve body of the switching valve are specified. By this specification, it is not necessary to secure a space for installing the switching valve in the engine room as compared with the case where the switching valve is installed outside the engine.

  Preferably, the engine cooling device according to the present invention includes a radiator passage for guiding the coolant discharged from the water jacket in the block or the water jacket in the head through the radiator and then to the switching valve, and bypasses the radiator in the radiator passage. A bypass passage connected in such a manner, a water pump for flowing the coolant, and a control valve for controlling the coolant flow in the radiator passage according to the temperature of the coolant, The downstream side of the water jacket is connected to the water jacket in the head, and when the coolant temperature at the connecting portion of the bypass passage with respect to the radiator passage is lower than the valve opening start temperature set lower than the warm-up completion temperature, Whether only the bypass passage is provided by the switching valve and the control valve. A path for flowing the coolant to the water jacket in the head is created, and when the coolant temperature becomes equal to or higher than the warm-up completion temperature, the water in the block is supplied from both the bypass passage and the radiator passage by the switching valve and the control valve. It can be set as the structure which makes the path | route which distribute | circulates a cooling fluid to a jacket.

  Here, the water jacket path of the engine and the coolant flow path by the switching valve and the control valve are specified.

  Until the warm-up is completed, the coolant flows from the bypass passage only to the water jacket in the head, so that the temperature can be quickly raised without increasing the temperature difference between the cylinder block and the cylinder head. It becomes possible.

  When the warm-up is completed, the coolant flows from both the bypass passage and the radiator passage to the water jacket in the block, and further, the coolant flows into the water jacket in the head from the downstream side of the water jacket in the block. In addition, the heat of the cylinder head and the cylinder block can be efficiently recovered with the coolant and released to the atmosphere with the radiator.

  The present invention relates to the positioning of a sleeve-type valve body of a switching valve for switching a coolant flow path in an engine cooling device that allows coolant to flow independently between a water jacket of a cylinder block and a water jacket of a cylinder head. It is possible to reduce the power required for the operation.

It is a figure showing typically one embodiment of the engine cooling device concerning the present invention. It is sectional drawing which shows the switching valve of FIG. 1, and has shown the state by which the sleeve type valve body of the said switching valve is arrange | positioned in the lowest position. It is a perspective view of the state which made a section of a sleeve type valve element of Drawing 2 into a section. FIG. 3 is a cross-sectional view taken along line (4)-(4) in FIG. 2. It is sectional drawing which shows the switching valve of FIG. 1, and has shown the state by which the sleeve type valve body of the said switching valve is arrange | positioned in the up-down direction middle. It is sectional drawing which shows the switching valve of FIG. 1, and has shown the state by which the sleeve type valve body of the said switching valve is arrange | positioned in the uppermost position. It is the figure which looked at the cylinder block from the top in other embodiment of the engine cooling device which concerns on this invention. It is a figure which shows the drive source (thermo element) and power transmission mechanism in the actuator of the switching valve shown in FIG. 7, and has shown the state by which the sleeve type valve body is arrange | positioned in the lowest position. It is a figure which shows the drive source (thermo element) and power transmission mechanism in the actuator of the switching valve shown in FIG. 7, and has shown the state by which the sleeve type valve body is arrange | positioned in the uppermost position.

  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  1 to 6 show an embodiment of the present invention. In this embodiment, an in-line multi-cylinder engine will be described as an example. The engine 1 shown in FIG. 1 includes at least a cylinder block 11 and a cylinder head 12.

  A water jacket 13 is provided in the cylinder block 11. A water jacket 14 is provided in the cylinder head 12. The in-block water jacket 13 and the in-head water jacket 14 are internal passages for the coolant in the engine 1. The coolant is an antifreeze such as an aqueous solution of ethylene glycol.

  The cylinder block 11 in this embodiment is called an open deck type, and the water jacket 13 in the block communicates with the water jacket 14 in the head.

  The coolant outlet 15 from the block water jacket 13 and the head water jacket 14 is provided in the cylinder head 12 at, for example, the rear end side in the cylinder arrangement direction. The takeout portion 15 is the downstream end of the water jacket in the head. On the other hand, the coolant recirculation part 16 for the in-block water jacket 13 and the in-head water jacket 14 is provided, for example, on the front end side in the cylinder arrangement direction in the cylinder block 11.

  The radiator passage 2 is connected in communication with the coolant take-out portion 15 and the reflux portion 16. The radiator passage 2 is provided with a water pump 4 and a radiator 5.

  The water pump 4 is provided near the reflux portion 16 of the cylinder block 11 in the radiator passage 2. Although not shown, the water pump 4 is a mechanical water pump that operates by transmitting the rotation of the crankshaft by a power transmission device (including a pulley, a belt, and the like).

  The radiator 5 is a heat exchanger for dissipating the heat of the coolant to the atmosphere, and is provided in the radiator passage 2 on the upstream side of the water pump 4 in the coolant flow direction.

  A bypass passage 3 for bypassing the radiator 5 is connected to the upstream side and the downstream side of the radiator 5 in the radiator passage 2. In the bypass passage 3, a heater core 6 is provided at a position near the upstream connection portion with the radiator passage 2. The heater core 6 is a heat exchanger for heating the vehicle interior.

  Further, a control valve 7 is provided on the upstream side of the radiator passage 2 with respect to the connection portion with the bypass passage 3. The control valve 7 controls the coolant flow in the radiator passage 2 in accordance with the temperature of the coolant in the connection portion, thereby allowing the coolant to be constantly recirculated from the bypass passage 6 to the reflux portion 16 from the radiator passage 2. The ratio of mixing the coolant to be refluxed to the reflux unit 16 is adjusted.

  Specifically, the control valve 7 is a so-called thermostat. The thermostat means a temperature sensing type automatic operation valve in the automobile related industry. Since the control valve 7 composed of this thermostat is generally the same as a known configuration, a detailed illustration and description thereof will be omitted. However, a valve body for adjusting the opening of the radiator passage 2 and a valve body for operating the valve body are operated. And a thermo actuator. The thermoactuator includes a temperature sensing unit that is filled with a thermowax that senses the coolant temperature in the bypass 6 and a plunger that is housed in the temperature sensing unit so as to protrude or retract. The valve body is attached to the outer end of the plunger, and the valve body is displaced to the open side or the closed side by sliding the plunger.

  The operation of the control valve 7 composed of this thermostat will be described. When the coolant temperature in the vicinity of the temperature sensing unit is lower than a predetermined valve opening start temperature, the thermowax coagulates and contracts and the wax pressure decreases, so that the plunger is drawn into the temperature sensing unit and the valve body is It is displaced to the fully closed position. When fully closed, the coolant from the radiator passage 2 does not flow into the reflux unit 16, and only the coolant from the bypass 6 flows into the reflux unit 16.

  When the coolant temperature in the vicinity of the temperature sensing unit becomes equal to or higher than the valve opening start temperature, the thermowax is gradually melted and expanded, so that the wax pressure gradually increases. The valve body begins to pop out gradually and starts to open the valve body. Further, when the coolant temperature in the vicinity of the temperature sensing part becomes equal to or higher than a predetermined full opening temperature, the plunger jumps out from the temperature sensing part to the outermost position and displaces the valve body to the full opening position. When the valve body is opened, the coolant from the radiator passage 2 is mixed with the coolant from the bypass passage 6 and flows into the reflux unit 16 side.

  In this embodiment, the switching valve 8 is provided in the vicinity of the reflux unit 16 in the cylinder block 11. This recirculation | reflux part 16 is corresponded to the "coolant introduction part" described in the claim.

  Specifically, as shown in FIGS. 2 to 6, the switching valve 8 is a so-called “sliding valve”, and includes a cylinder chamber 81, a sleeve-type valve body 82, a reverse spring 83, and the like.

  The cylinder chamber 81 is provided in the vicinity of the reflux portion 16 of the cylinder block 11. The cylinder chamber 81 is formed of a cylindrical space, and is provided so that the central axis thereof is substantially parallel to the central axis of the cylinder bore (cylinder) of the cylinder block 11.

  In the cylinder chamber 81, the inner end opening of the reflux portion 16, the upstream opening of the communication passage 84 for the water jacket 13 in the block, and the upstream opening of the communication passage 85 for the head water jacket 14 are opened. .

  The sleeve-type valve body 82 is penetrated at both ends in the axial direction, and an introduction port 82a, a block-side outlet 82b, and a head-side outlet 82c are provided on the peripheral wall.

  The introduction port 82 a is provided so as to match and communicate with the inner end opening of the reflux portion 16 when being slid to the floor surface side of the cylinder chamber 81.

  The block-side outlet 82b is provided so as to match and communicate with the upstream opening of the communication passage 84 for the water jacket 13 in the block when the block-side outlet 82b is slid to the ceiling surface side (the other end side in the central axis direction) of the cylinder chamber 81. It has been.

  The head-side outlet 82c is provided so as to match and communicate with the upstream opening of the communication passage 85 with respect to the water jacket 14 in the head when it is slid to the floor surface side (one end side in the central axis direction) of the cylinder chamber 81. ing.

  The reverse spring 83 is housed in a compressed state between the upper end of the sleeve type valve element 82 and the ceiling surface of the cylinder chamber 81, and the sleeve type valve element 82 is moved to the floor surface of the cylinder chamber 81 by its elastic restoring force. Energize to press against.

  Such a switching valve 8 is actuated by an actuator 9. The actuator 9 has a configuration in which a thermo element whose overall length automatically increases as the temperature of the coolant increases is used as a drive source. In this embodiment, three thermo elements 91, 92, 93 are connected in series, and the overall appearance is a rod shape.

  The thermo elements 91 to 93 are well known and will be briefly described. However, the temperature sensing units 91a, 92a, and 93a filled with a thermo wax that senses the coolant temperature, and the temperature sensing units 91a to 93a protrude or retract into the temperature sensing units 91a to 93a. Plungers 91b, 92b, 93b that can be accommodated are provided.

  The actuator 9 is accommodated in the sleeve type valve element 82 so as to be along the central axis, and the outer end (upper end) of the plunger 91b of the uppermost thermo element 91 is formed in a cross shape of the sleeve type valve element 82. The lower surface of the temperature sensing portion 93 a of the thermoelement 93 at the lowest position is fixed to the floor surface of the cylinder chamber 81.

  As a result, the driving force along the linear direction generated by the actuator 9 is directly transmitted to the sleeve type valve element 82, and the sleeve type valve element 82 is raised or lowered. With this configuration, the actuator 9 in this embodiment has a configuration that does not require a power transmission mechanism.

  The operation of this actuator 9 will be described. First, a valve opening start in which the coolant temperature in the vicinity of each of the temperature sensing portions 91a to 93a of the thermo elements 91 to 93 (hereinafter referred to as in-block coolant temperature) is set lower than the warm-up completion temperature (for example, about 88 ° C.). When the temperature is lower than the temperature, the thermowax in each of the temperature sensing portions 91a to 93a of the thermoelements 91 to 93 is coagulated and contracted and the wax pressure is low, so that the plungers 91b to 93b of the thermoelements 91 to 93 are The full length dimension of the actuator 9 is minimized by being drawn into the temperature sensing portions 91a to 93a. When the coolant temperature in the block becomes equal to or higher than the valve opening start temperature, the wax in the temperature sensing portions 91a to 93a of the thermo elements 91 to 93 is gradually melted and expanded, so that the wax pressure is gradually increased. Thus, the plungers 91b to 93b of the thermo elements 91 to 93 start to jump out from the temperature sensing units 91a to 93a. After that, when the coolant temperature in the block becomes equal to or higher than the warm-up completion temperature, the plungers 91b to 93b of the thermo elements 91 to 93 jump out to the maximum from the temperature sensing parts 91a to 93a, and the overall length of the actuator 9 is maximized. Become.

  Thus, the internal passage (water jackets 13 and 14) of the engine 1, the external passage (the radiator passage 2 and the bypass passage 3), the water pump 4, the radiator 5, the control valve 7, and the switching valve 8 are used. An engine cooling device is configured.

  Next, the operation of the switching valve 8 will be described.

  (1) When the engine 1 is cold-started, that is, when the coolant temperature in the block is lower than the valve opening start temperature, the plungers 91b to 93b of the thermo elements 91 to 93 are placed in the temperature sensing units 91a to 93a. Since the full length dimension of the actuator 9 is minimized by being pulled, the sleeve type valve element 82 is pushed down to the floor surface (lowermost position) of the cylinder chamber 81 by the elastic restoring force of the reverse spring 83 as shown in FIG. Yes.

  At this time, the inner end opening of the reflux portion 16 and the introduction port 82a of the sleeve type valve body 82 are in communication with each other, and the head side outlet 82c of the sleeve type valve body 82 and the upstream opening of the head side communication passage 85 are connected. Match and communicate.

  However, the block side outlet 82b of the sleeve type valve element 82 is closed by the inner peripheral surface of the cylinder chamber 81, and the upstream opening of the block side communication passage 84 is closed by the outer peripheral wall surface of the sleeve type valve element 82. The block-side outlet 82b of the body 82 and the upstream opening of the block-side communication passage 84 are completely disconnected.

  In this state, the coolant flowing into the recirculation unit 16 can flow (introduce) only into the water jacket 14 in the head via the head side communication passage 85 as shown by a solid arrow in FIG.

  (2) When the coolant temperature in the block becomes equal to or higher than the valve opening start temperature, the plungers 91b to 93b of the thermo elements 91 to 93 start to jump out of the temperature sensing units 91a to 93a, and accordingly the sleeve type valve The body 82 is gradually pushed up.

  As shown in FIG. 5, when the sleeve type valve element 82 is pushed up to the middle in the vertical direction, the inner end opening of the reflux portion 16 and the introduction port 82a of the sleeve type valve element 82 communicate with each other about half. The block side outlet 82b of the die valve body 82 and the upstream opening of the block side communication passage 84 communicate with each other about half, and further, the head side outlet 82c of the sleeve type valve body 82 and the upstream opening of the head side communication passage 85 communicate with about half. To do.

  In this state, the coolant flowing into the reflux section 16 can flow (introduce) into the water jacket 14 in the head via the head side communication passage 85 as shown by the solid arrow and the one-dot chain arrow in FIG. Then, it is possible to flow (introduce) into the water jacket 15 in the block via the block side communication passage 84. The coolant flowing into the block inner water jacket 15 flows into the head inner water jacket 14 on the downstream side of the block inner water jacket 15, and is then discharged from the outlet 15.

  (3) When the coolant temperature in the block becomes equal to or higher than the warm-up completion temperature, the plungers 91b to 93b of the thermoelements 91 to 93 jump out to the maximum from the temperature sensing portions 91a to 93a, and the overall length of the actuator 9 is maximum. Therefore, as shown in FIG. 6, the sleeve type valve body 82 is pushed up to the uppermost position on the ceiling surface side of the cylinder chamber 81 by the plungers 91 b to 93 b of the thermo elements 91 to 93.

  At this time, the inner end opening of the reflux portion 16 is completely exposed to the cylinder chamber 81, and the block side outlet 82b of the sleeve type valve body 82 and the upstream opening of the block side communication passage 84 are in communication with each other. .

  However, the head side outlet 82c of the sleeve type valve body 82 is closed by the inner peripheral surface of the cylinder chamber 81, and the upstream opening of the head side communication passage 85 is closed by the outer peripheral wall surface of the sleeve type valve body 82. The head side outlet 82c of the body 82 and the upstream opening of the head side communication passage 85 are completely disconnected.

  In this state, as shown by the two-dot chain line arrow in FIG. 1, the coolant flowing into the recirculation unit 16 can flow (introduce) only into the in-block water jacket 15 via the block-side communication passage 84.

  Next, the operation of the engine cooling apparatus having the above configuration will be described.

  First, when the engine 1 is cold-started, that is, when the coolant temperature in the vicinity of the temperature sensing portion of the control valve 7 (hereinafter referred to as engine reflux coolant temperature) is lower than the valve opening start temperature, the control valve 7 is fully turned on. Closed. On the other hand, when the coolant temperature (coolant temperature in the block) in the vicinity of the temperature sensing portions 91a to 93a of the actuator 9 is lower than the valve opening start temperature, the switching valve 8 is in the state (1).

  Thereby, as shown by the solid line arrow in FIG. 1, the coolant is circulated with the in-head water jacket 14 and the bypass passage 3 as a closed loop. Specifically, the coolant in the head water jacket 14 is discharged from the take-out portion 15 to the radiator passage 2 by the water pump 4 driven by the engine 1, and this coolant bypasses the radiator 5 in the radiator passage 2 without passing through the radiator 5. Only the passage 3 is circulated and returned to the reflux portion 16 of the water jacket 14 in the head. In this case, the heat of the cylinder head 12, particularly in the vicinity of the combustion chamber, is transmitted to the coolant flowing through the water jacket 14 in the head, so that the temperature difference between the cylinder block 11 and the cylinder head 12 does not increase and the temperature rises quickly. Will be.

  When the engine reflux coolant temperature becomes equal to or higher than the valve opening start temperature, the thermowax of the control valve 7 is gradually melted and expanded, so that the control valve 7 starts to open gradually. On the other hand, when the coolant temperature in the block becomes equal to or higher than the valve opening start temperature, the switching valve 8 is in the state (2).

  As a result, as indicated by solid line arrows and one-dot chain line arrows in FIG. 1, the coolant discharged from the take-out portion 15 flows not only to the bypass passage 3 but also to the radiator passage 2, and the bypass passage 3 and the radiator passage. 2 flows through the recirculation unit 16 via the switching valve 8 to the water jacket 14 in the head and the water jacket 15 in the block at an appropriate ratio.

  Thereafter, when the engine reflux coolant temperature becomes equal to or higher than the warm-up completion temperature, the control valve 7 is fully opened. On the other hand, when the coolant temperature in the block becomes equal to or higher than the warm-up completion temperature, the switching valve 8 is in the state (3).

  Thereby, as indicated by the two-dot chain line arrow in FIG. 1, the coolant flowing into the reflux portion 16 flows into the water jacket 13 in the block, and after flowing from the water jacket 13 in the block to the water jacket 14 in the head, It is discharged from the outlet 15. The coolant flows through both the bypass passage 3 and the radiator passage 2 and returns to the in-block water jacket 13. The coolant flowing in this way recovers the heat of the cylinder head 11 and the cylinder block 12 and dissipates this heat to the atmosphere by the radiator 5, so that the temperature of the coolant is adjusted within a certain range. Become.

  As described above, in the embodiment to which the present invention is applied, in the engine cooling apparatus that allows the coolant to flow independently between the water jacket 13 in the block and the water jacket 14 in the head of the engine 1, the coolant flow path The electric power necessary for positioning the sleeve type valve element 82 in the switching valve 8 for switching between the two is made unnecessary.

  In other words, in this embodiment, the switching valve 8 is a sliding valve, and the sleeve type valve element 82 is pressed against the floor surface of the cylinder chamber 81 by the elastic restoring force of the reverse spring 83 when the overall length of the actuator 9 is minimized. On the other hand, the sleeve type valve element 82 is positioned at the uppermost position on the ceiling surface side of the cylinder chamber 81 against the elastic restoring force of the reverse spring 83 when the overall length of the actuator 9 reaches the maximum. I try to let them.

  Since the sleeve type valve element 82 is merely pressed against the floor surface and the ceiling surface side of the cylinder chamber 81 by using the actuator 9 whose full-length dimension is automatically increased or decreased according to the temperature of the coolant as described above, Electric power for positioning the sleeve type valve element 82 is not necessary. Therefore, for example, it is possible to eliminate wasteful power consumption as in the conventional example shown in Patent Document 1.

  In addition, since the switching valve 8 and the actuator 9 are provided in the cylinder block 11, compared to the case where the switching valve 8 and the actuator 9 are installed outside the engine 1, the switching valve 8 and the actuator are provided in the engine room (not shown). It is not necessary to secure the installation space of 9.

  Further, the sleeve type valve element 82 of the switching valve 8 is positioned by being pressed against the floor surface of the cylinder chamber 81 by the elastic restoring force of the reverse spring 83, while the plungers 91b to 93b of the thermo elements 91 to 93 are set to the respective temperatures. It is positioned by being pushed up to the uppermost position by protruding from the sensing portions 91a to 93a to the maximum extent. Thus, the stop control during the sliding operation of the sleeve-type valve element 82 of the switching valve 8 is simpler than the stop control during the rotational operation of the conventional rotary valve shown in Patent Document 1, for example. Since a sensor for detecting the movement of the actuator 9 of the switching valve 8 or the sleeve-type valve element 82 and a control system for operating the actuator 9 of the switching valve 8 are not required, the equipment cost can be reduced. .

  In addition, this invention is not limited only to the said embodiment, It can change suitably in the range equivalent to the claim and the said range.

  (1) FIGS. 7 to 9 show other embodiments of the present invention. In this embodiment, thermoelements 91 to 93 serving as drive sources for the actuator 9 are installed on the upstream side of the water jacket 13 in the block, and the driving force generated by the thermoelements 91 to 93 is transmitted to the sleeve type valve element 82. The configuration of the power transmission mechanism 94 for raising and lowering the sleeve type valve body 82 is specifically shown.

  The power transmission mechanism 94 includes two pulleys 94a and 94b and a wire 94c. The first pulley 94 a is installed above the sleeve type valve element 82, and the second pulley 94 b is installed between the sleeve type valve element 82 and the actuator 9. One end of the wire 94c is connected to the plunger 91b of the uppermost thermoelement 91 in the thermoelements 91 to 93 serving as a driving source, and the other end of the wire 94c is a predetermined upper end position of the sleeve type valve element 82 ( For example, it is connected to the mounting piece 82d).

  In such a configuration, when the coolant temperature in the vicinity of the temperature sensing portions 91a to 93a of the thermo elements 91 to 93, that is, the water jacket 13 in the block rises, the plungers 91b to 93b of the thermo elements 91 to 93 become the temperature sensing portions. Since it protrudes from 91a to 93a, the wire 94c is pulled by the plungers 91b to 93b, and the sleeve type valve element 82 is pushed up according to the pulling stroke (see FIG. 9).

  When the coolant temperature of the water jacket 13 in the block is lower than the warm-up completion temperature, the plungers 91b to 93b of the thermo elements 91 to 93 are retracted into the temperature sensing portions 91a to 93a, respectively. 94c is not pulled. Therefore, it is pushed down by the dead weight of the sleeve type valve body 82 and the elastic restoring force of the reverse spring 83 and is pressed against the floor surface of the cylinder chamber 81 (see FIG. 8).

  When the sleeve type valve body 82 is pushed up and pushed down in this way, the pressure of the coolant flowing in from the reflux portion 16 and the introduction port 82a is applied to the inner peripheral wall of the sleeve type valve body 82 from the radial direction. However, since the sleeve type valve body 82 is fixedly moved by being pressed against the floor surface of the cylinder chamber 81 by its own weight and the elastic restoring force of the reverse spring 83, the patent document 1 As in the conventional example shown in FIG. 2, there is no need to continue operating the actuator.

  (2) In the above embodiment, an example in which the three thermo elements 91 to 93 are used as the drive source of the actuator 9 is described, but the number of use is not particularly limited.

  (3) Although the example which made the water pump 4 mechanical type is given in the said embodiment, this invention is not limited to this, The said water pump 4 can be made into an electric type. In such a configuration, for example, if the water pump 4 is not operated during the cold start of the engine 1, it is possible to prevent the coolant from flowing in the water jackets 13 and 14. If it does in this way, it will become easy to raise a coolant temperature further at the time of warming-up compared with the said embodiment.

  (4) In the above embodiment, an example is given in which the control valve 7 and the switching valve 8 are thermostats, but the present invention is not limited to this. The control valve 7 and the switching valve 8 may be of a type that is operated by receiving an operation instruction from a control system such as an ECU, for example, an electromagnetic valve or an electric valve.

  The present invention can be applied to, for example, an engine cooling device that allows coolant to flow independently through an in-block water jacket and an in-head water jacket.

1 engine
11 Cylinder block
12 Cylinder head
13 Water jacket in block
14 Water jacket in the head
15 Cooling liquid outlet
16 Coolant reflux section
2 Radiator passage
3 Bypass passage
4 Water pump
5 Radiator
7 Control valve
8 Switching valve
81 Cylinder chamber of switching valve
82 Sleeve type valve body of switching valve
82a Sleeve-type valve body inlet
82b Block side outlet of sleeve type valve
82c Head side outlet of sleeve type valve body
83 Reverse spring of switching valve
84 Block side communication passage
85 Head side communication passage
9 Switching valve actuator
91-93 Thermo element 91a-93a Temperature sensing part of thermo element 91b-93b Plunger of thermo element

Claims (5)

A switching valve for enabling introduction of the cooling liquid into the water jacket in the block or the water jacket in the head, and an actuator for operating the switching valve in accordance with a temperature change of the cooling liquid,
The switching valve is a sliding valve in which a sleeve type valve body is housed in a cylindrical cylinder chamber so as to be slidable along its central axis, and the valve body is slid to one end side of the cylinder chamber by the actuator. When the valve body is slid to the other end of the cylinder chamber by the actuator, the coolant is introduced into the water jacket in the block. An engine cooling device characterized in that it is in a state where it can be introduced. The engine cooling device according to claim 1, wherein
The engine cooling device according to claim 1, wherein the switching valve includes a reverse spring for biasing the sleeve type valve body so as to press the sleeve type valve element against one end side of the cylinder chamber. The engine cooling device according to claim 1 or 2,
The engine cooling apparatus according to claim 1, wherein the actuator includes a thermo element whose overall length automatically increases as the temperature of the coolant increases, as a drive source. In the engine cooling device according to any one of claims 1 to 3,
The switching valve is provided in the vicinity of a coolant introduction part provided in the cylinder block in the cylinder block,
Inside the cylinder chamber of the switching valve, an inner end opening of the coolant introduction part, an upstream opening of a communication passage to the water jacket in the block, and an upstream opening of a communication passage to the water jacket in the head are opened. ,
The sleeve-type valve body has an axial opening that is penetrated at both ends in the axial direction, and the peripheral wall of the sleeve-type valve body that is slid toward one end of the cylinder chamber and communicates with the inner end opening of the coolant introduction portion. And a head-side outlet that communicates with and communicates with the upstream opening of the head-side communication passage, and matches the upstream opening of the block-side communication passage while being slid to the other end of the cylinder chamber. An engine cooling device characterized in that a block side outlet communicating therewith is provided. The engine cooling device according to any one of claims 1 to 4,
A radiator passage for guiding coolant discharged from the water jacket in the block or the water jacket in the head to the switching valve after passing through the radiator;
A bypass passage connected to bypass the radiator in the radiator passage;
A water pump for flowing the coolant,
A control valve for controlling the coolant flow in the radiator passage according to the temperature of the coolant,
The downstream side of the water jacket in the block is connected to the water jacket in the head,
When the coolant temperature at the connection portion of the bypass passage with respect to the radiator passage is lower than the valve opening start temperature set lower than the warm-up completion temperature, the switching valve and the control valve allow the water in the head from the bypass passage alone. Create a route for circulating coolant to the jacket,
When the coolant temperature becomes equal to or higher than the warm-up completion temperature, a path for circulating the coolant from both the bypass passage and the radiator passage to the water jacket in the block is created by the switching valve and the control valve. Engine cooling device to do.

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