JP2016027257A - Oil circuit relief device for engine - Google Patents

Abstract

PURPOSE: To provide an oil circuit relief device for an engine including a hydraulic relief valve and a temperature sensitive relief valve, capable of executing oil relief (discharge) with the aiming pressure of oil regardless of whether the temperature of the oil is high or low, and simplifying its configuration.BACKGROUND ART:CONSTITUTION: An oil circuit relief valve includes an upstream flow path 61 provided ranging from a discharge part side of an oil pump 9 to an engine E, a hydraulic relief valve A of which a valve element 1 is moved to perform oil relief, and a temperature sensitive relief valve B which is opened/closed in a stepless manner when sensing a temperature of oil, to perform oil relief. In the upstream flow path 61, the hydraulic relief valve A and the temperature sensitive relief valve B are arranged in parallel to each other. A thermo operating load F of a temperature sensitive drive part 42 is set to be higher than a cutting load T for cutting contamination passing through a second relief outflow part 52 when a communication path 41a of a temperature sensitive valve part 41 moves in the second relief outflow part 52.SELECTED DRAWING: Figure 10

Description

  The present invention includes a hydraulic relief valve and a temperature-sensitive relief valve, and enables oil relief (discharge) to be performed at a target oil pressure regardless of the oil temperature, and the configuration thereof can be simplified. The present invention relates to a relief device for an engine oil circuit.

  Conventionally, there are various types of pumps for supplying oil for lubrication and cooling to an engine, each having a relief valve that performs relief when the discharge pressure exceeds a predetermined value. Further, there is a relief device for an oil circuit of an engine of a type that judges whether or not relief is executed in response to a change in pressure and an oil temperature change.

  As a specific example of this type, there is a third embodiment of Patent Document 1. The third embodiment of Patent Document 1 is an oil pump including a first control valve (4) and a second control valve (7). This Patent Document 1 will be outlined. In addition, the code | symbol used for patent document 1 is used as it is. The first control valve (4) is configured to function as a relief valve when the discharge pressure of the working oil in the discharge oil passage (5) downstream of the oil pump X is high.

The second control valve (7) operates according to the temperature of the working oil to control the first control valve (4), specifically, in the second valve chamber (44) of the first control valve (4). This is a valve for controlling the hydraulic pressure of the working oil flowing in. The second control valve (7) includes a valve body operating mechanism (73) that causes the valve body (72) to reciprocate according to the temperature of the operating oil. The valve body operating mechanism (73) is a temperature-sensitive expansion / contraction body (73a) that expands and contracts,
Specifically, a spring made of shape memory alloy is used.

The first control valve (4) and the second control valve (7) communicate with each other through a first inter-valve oil passage (91) and a second inter-valve oil passage (92). The hydraulic pressure of the valve element (42) of the first control valve (4) is controlled by switching the communication between the first valve oil passage (91) and the second valve oil passage (92). Yes. As described above, in Patent Document 1, the first control valve (4) and the second control valve (7) do not operate independently but operate while being related to each other.

JP 2006-214286 A

In Patent Document 1, since the second control valve (7) expands and contracts according to the change in oil temperature, the first control valve (4) operates under the influence of the oil temperature. When the oil temperature is high, the oil temperature is about 110 ° C to 130 ° C. For example, when the oil temperature is 50 ° C, the oil pressure is higher than when the oil temperature is about 110 ° C to 130 ° C. .

Therefore, when the oil temperature is low, such as 50 ° C., the discharge pressure per rotor speed is higher than when the oil temperature is about 110-130 ° C. Therefore, the straight line L 1 described in each figure The first control valve (4) performs relief of the discharge pressure when the inclination of the pressure becomes steep and the discharge pressure rises to a predetermined value. From the above operation, the oil pressure is higher at the low oil temperature, so there is a lot of energy loss.

The second control valve (7), which is a temperature sensing valve, is a control valve for increasing or decreasing the relief pressure of the first control valve (4) .The control variation of the second control valve (7) and the first control valve ( The control variation of 4) was added by series connection, resulting in a large control variation. In addition, since the second control valve (7) is a valve that controls the hydraulic pressure, not the flow rate, it is a so-called ON / OFF type valve that transmits almost all of the hydraulic pressure if it is somewhat transported, and fine control is difficult. It was a thing.

  An object of the present invention (problem to be solved) is an extremely simple configuration, and can have substantially the same hydraulic characteristics regardless of the oil temperature, and can suppress a reduction in fuel consumption especially at low oil temperatures. An object is to provide an oil circuit relief device for an engine that is inexpensive and highly reliable.

  In view of this, the inventor has intensively studied to solve the above problems, and as a result, the invention of claim 1 includes an oil pump and an upstream flow path provided from the discharge portion side of the oil pump to the engine. It has a hydraulic relief valve that relieves oil by moving the valve body under the pressure of oil, and a temperature-sensitive relief valve that relieves oil by sensing the oil temperature and opening and closing steplessly. In the upstream flow path, the hydraulic relief valve and the temperature-sensitive relief valve are arranged in parallel, and the temperature-sensitive relief valve includes a temperature-sensitive valve body and a temperature-sensitive housing, A temperature sensing valve section having a communication passage, and the temperature sensing drive section has a piston that appears and disappears by detecting the oil temperature by thermo wax, the temperature sensing valve section is connected to the piston, Temperature-sensitive housing A second relief inflow portion and a second relief outflow portion are formed in the inner peripheral side surface, and the temperature sensitive valve portion can open and close the second relief inflow portion and the second relief outflow portion by sliding, The thermo-actuating load of the temperature sensing drive unit is such that when the communication path of the temperature sensing valve unit moves through the second relief inflow portion and the second relief outflow portion, the second relief inflow portion and the second relief The above problem has been solved by providing a relief device for an engine oil circuit that is set to be larger than the cutting load for cutting the contamination passing through the outflow portion.

  According to a second aspect of the present invention, there is provided an oil pump, an upstream flow path provided from the discharge portion side of the oil pump to the engine, and a hydraulic relief valve for performing oil relief by moving a valve body by oil pressure. A temperature-sensitive relief valve that performs oil relief by sensing the oil temperature and opening and closing in a stepless manner, and the hydraulic relief valve and the temperature-sensitive relief valve are arranged in parallel in the upstream flow path. The temperature-sensitive relief valve is provided with a temperature-sensitive valve body and a temperature-sensitive housing, and the temperature-sensitive valve body includes a temperature-sensitive drive unit and a temperature-sensitive valve unit, and the temperature-sensitive valve unit has an inflow hole. The temperature sensing drive unit has a piston that appears and disappears when oil temperature is detected by a thermo wax, the temperature sensing valve unit is connected to the piston, and the temperature sensing housing has a second relief outflow portion in the inner peripheral side surface. Formed, the feeling The valve part can open and close the second relief outflow part by sliding, and the thermo-actuating load of the temperature sensing drive part is determined when the temperature relief valve part moves through the second relief outflow part. The above problem has been solved by providing a relief device for an engine oil circuit that is set to be larger than the cutting load for cutting the contamination passing through the outflow portion.

  According to a third aspect of the present invention, in the relief device for an oil circuit of an engine according to the first or second aspect, when the oil temperature is low, the temperature-sensitive relief valve is a relief of the oil circuit of the engine in which oil relief is performed. By using the apparatus, the above-mentioned problems have been solved. According to a fourth aspect of the present invention, in the relief device for an oil circuit of an engine according to the first or second aspect, when the oil temperature is medium oil temperature, the temperature sensitive relief valve has a large amount of oil relief around a low oil temperature and a high oil temperature. The above problem has been solved by providing a relief device for an oil circuit of an engine which is performed so that the amount of oil relief is reduced in the vicinity.

  According to a fifth aspect of the present invention, in the relief device for an engine oil circuit according to the first or second aspect, when the oil temperature is high, the temperature-sensitive relief valve does not perform oil relief. As a result, the above problems were solved. The engine oil circuit relief device according to any one of claims 1, 2, 3, 4 and 5, wherein the temperature-sensitive relief valve is provided in the engine. The above problem was solved by using a relief device for the oil circuit. The invention according to claim 7 is the relief device for an oil circuit of an engine according to any one of claims 1, 2, 3, 4 or 5, wherein the temperature sensitive drive part of the temperature sensitive relief valve is the oil The above problem has been solved by providing a relief device for the engine oil circuit that intersects the upstream flow path in the pump housing.

  In the first aspect of the invention, in the upstream flow path provided in the engine or the main gallery of the engine from the discharge part of the oil pump, a hydraulic relief valve that performs relief while the valve body is moved by oil pressure, and the oil temperature Since the temperature-sensitive relief valve that senses and opens and closes is arranged in parallel, the hydraulic pressure-relief valve and the temperature-sensitive relief valve operate independently of each other.

  In other words, the hydraulic relief valve determines whether to perform an oil relief operation by sensing the discharge pressure of the oil pump, and the temperature sensitive relief valve determines whether to perform an oil relief operation by sensing the oil temperature. Is. Therefore, when oil is sent from the oil pump to the engine via the upstream flow path, the hydraulic pressure relief valve operates against changes in the oil pump discharge pressure that occur from the low engine speed range to the high engine speed range. However, the temperature-sensitive relief valve operates for changes in oil temperature.

  The hydraulic relief valve and the temperature-sensitive relief valve are arranged in parallel in the upstream flow path, and each of them can perform a relief operation individually or both simultaneously. For this reason, if only one of the oil discharge pressure from the oil pump and the oil temperature changes and the oil relief is necessary, the oil pressure relief valve or the temperature sensitive relief valve will respond and perform oil relief. It is something that can be done.

  Here, the parallel means that the hydraulic relief valve and the temperature-sensitive relief valve are not connected in series, and as long as one of the relief valves is arranged in parallel by branching from the upstream flow path, A configuration in which the other relief valve is disposed on the upstream side and the other relief valve is disposed on the relatively downstream side is also included in parallel.

  In the configuration of the present invention, since the temperature-sensitive relief valve and the hydraulic relief valve are connected in parallel, more accurate control can be performed without adding up the control variations of the respective relief valves. In addition, the temperature-sensitive relief valve has a function to perform oil relief by sensing the oil temperature and opening and closing in a stepless manner, so it is not a conventional so-called ON / OFF type valve, and it is opened and closed in a stepless manner. it can. For example, if the temperature-sensitive relief valve is opened a little, the pressure is slightly reduced, so that the hydraulic pressure is reduced a little. Therefore, the hydraulic pressure can be adjusted steplessly by adjusting the opening / closing amount of the temperature-sensitive relief valve.

  In an oil circulation circuit provided with an oil pump for sending oil to the engine, contamination occurs during long-term use. This “Contami” is an abbreviation for “Contamination” and is a general term for foreign substances, sludge, chips, wear powder, and the like. This contamination flows through the oil circulation circuit. Contamination flows through the oil circulation circuit and is removed by the oil filter, but some may enter the valve. Such a thing cannot be prevented.

  If the second relief inflow portion and the second relief outflow portion are in an open state, the contamination flowing through the oil circulation circuit enters from the second relief inflow portion and is discharged as it is from the second relief outflow portion. There is no.

  However, when the temperature of the oil changes and rises, the temperature sensing valve moves in the temperature sensing housing, and the second relief inflow portion and the second relief outflow portion enter the closing operation from the open state. At this time, the contamination may be sandwiched between the edge of the communication passage of the temperature sensing valve body and the second relief inflow portion and the second relief outflow portion, and the movement of the temperature sensing valve portion stops. There is a possibility that the second relief inflow portion and the second relief outflow portion cannot be completely closed.

  In the first aspect of the invention, in particular, the thermo-actuating load of the temperature-sensitive drive unit is determined when the communication path of the temperature-sensitive valve unit moves through the second relief inflow portion and the second relief outflow portion. It is set as the structure set larger than the cutting load for cutting the contamination which passes the 2nd relief inflow part and the said 2nd relief outflow part. As described above, the temperature-sensitive relief valve of the present invention can cut the contamination at any position of the oil circulation circuit, and the temperature-sensitive valve body can always operate properly. Conventionally, the temperature-sensitive relief valve has to be installed on the downstream side of the installation position of the oil filter in order to prevent contamination from entering in the circuit, and the installation position is limited. However, according to the present invention, even if contamination enters the temperature-sensitive relief valve, the temperature-sensitive valve portion can move while cutting the contamination by the temperature-sensitive valve portion, the second relief inflow portion, and the second relief outflow portion. A temperature-sensitive relief valve can be installed at any position in the circuit.

  With such a configuration, even if contamination is sandwiched between the edge of the communication passage of the temperature sensing valve portion and the second relief inflow portion and the second relief outflow portion, the temperature sensing valve portion and the second relief By the relative movement of the inflow part and the temperature sensing valve part and the second relief outflow part, the contamination can be bitten, the temperature sensing valve part can continue a predetermined movement operation in the housing, It is possible to prevent the relief operation of the temperature-sensitive relief valve from being hindered.

  According to a second aspect of the present invention, the temperature sensitive valve portion in the temperature sensitive relief valve has an inflow hole, and the temperature sensitive housing has a second relief outflow portion formed in an inner peripheral side surface. The oil flows into the temperature sensing housing through the inflow hole of the temperature sensing valve portion, but the second relief outflow portion is opened and closed by the movement of the temperature sensing valve portion, and the oil relief is executed or stopped. is there. The relief operation by the temperature-sensitive relief valve in claim 2 is substantially the same as that of the invention of claim 1, and the configuration is substantially the same except for slight differences. Therefore, also in claim 2, the relief operation equivalent to claim 1 is performed.

  Also in the invention of claim 2, even if the contamination is sandwiched between the temperature sensing valve portion and the second relief outflow portion, the contamination is caused by the relative movement of the temperature sensing valve portion and the second relief outflow portion. The temperature sensing valve portion can continue a predetermined movement operation within the temperature sensing housing, and it is possible to prevent the relief operation of the temperature sensing relief valve from being hindered by contamination.

  In the invention of claim 3, when the oil temperature is low, the oil is relieved not only from the hydraulic relief valve but also from the temperature-sensitive relief valve. Thus, oil is always relieved from the temperature-sensitive relief valve at the low oil temperature when the oil pressure becomes high, regardless of whether the hydraulic relief valve is relieved. From the above, it is possible to prevent the oil pressure from increasing at a low oil temperature, and thus to prevent deterioration in fuel consumption at a low oil temperature.

  In the invention of claim 4, when the oil temperature is medium, the temperature-sensitive relief valve is operated so that the amount of oil relief is large near the low oil temperature and the amount of oil relief is small near the high oil temperature. The medium oil temperature is a temperature range between a low oil temperature and a high oil temperature. Therefore, there is a large temperature difference between the low oil temperature side and the high oil temperature side in the middle oil temperature. As a result, there is a great difference in the viscosity of the oil within the range of the intermediate oil temperature.

  Therefore, within the middle oil temperature, the lower the oil temperature, the greater the oil viscosity and the higher the oil pressure, and the higher the oil temperature, the smaller the viscosity and the oil pressure decreases. Therefore, the temperature-sensitive relief valve is controlled so that the relief amount is increased in the middle oil temperature range when the oil temperature is low, so the oil pressure does not increase even if the oil temperature decreases, and the discharge pressure is reduced. It can be maintained at a constant low oil pressure and does not cause deterioration of fuel consumption.

  In the invention of claim 5, when the oil temperature is high, the temperature-sensitive relief valve is configured not to perform oil relief. Thereby, cooling and lubrication can be promoted. In the invention of claim 6, the temperature-sensitive relief valve is provided in the engine, so that the temperature-sensitive relief valve is located immediately upstream of the main gallery which is an oil passage disposed in the cylinder block, and the engine By attaching to the cylinder block, the cylinder block of the engine can also serve as the housing of the temperature-sensitive relief valve without preparing a special valve housing for the temperature-sensitive relief valve, reducing the size of the device and reducing the number of parts. realizable.

  In the invention of claim 7, the degree of freedom of the installation position of the temperature-sensitive relief valve is increased according to the present invention, and in particular, the temperature-sensitive drive unit intersects the upstream flow path in the housing of the oil pump, so The followability to the oil temperature is improved and more accurate control is possible.

It is a schematic diagram showing the composition of the oil circulation circuit of the engine which has the relief channel of a 1st embodiment in the present invention. FIG. 5 is an enlarged schematic view showing an oil relief operation in a low oil temperature and low engine speed range. FIG. 5 is an enlarged schematic view showing an oil relief operation at a low oil temperature and in a medium engine speed range to a high engine speed range. (A) is an enlarged schematic diagram showing an oil relief operation near the low oil temperature in the middle oil temperature range and in the low engine speed range, and (B) is near the high oil temperature in the middle oil temperature range and low engine rotation. It is an expansion schematic diagram showing the relief operation of oil in several regions. (A) is an enlarged schematic diagram showing the oil relief operation in the middle to high engine speed range near the low oil temperature in the middle oil temperature range, and (B) is in the middle oil temperature range near the high oil temperature. FIG. 5 is an enlarged schematic diagram showing an oil relief operation in a medium to high engine speed range. FIG. 5 is an enlarged schematic view showing an oil relief operation in a high oil temperature and low engine speed range. FIG. 5 is an enlarged schematic view showing an oil relief operation at a high oil temperature and from a medium engine speed range to a high engine speed range. It is a schematic diagram showing the composition of the oil circulation circuit of the engine which has the relief channel of a 2nd embodiment in the present invention. It is a graph which shows the characteristic of this invention. (A) is a state diagram in which contamination flows into and out of the temperature sensing valve body, the second relief inflow portion and the second relief outflow portion of the temperature relief valve, and (B) is a state diagram of the temperature sensing valve body and the second relief inflow valve. 2 is a state diagram in which the contamination is sandwiched between the relief inlet and the second relief outlet, and (C) is a state diagram in which the contamination is cut by the temperature-sensitive valve body of the temperature-sensitive relief valve, the second relief inlet and the second relief outlet. , (D) is an enlarged view of the (α) portion of (A), (E) is an enlarged view of the (β) portion of (B), (F) is an enlarged view of the (γ) portion of (C), and (G) is It is a perspective view of contamination. (A) is a plan view of an embodiment in which a hydraulic relief valve and a temperature-sensitive relief valve are incorporated in an oil pump according to the present invention, (B) is a cross-sectional view taken along the line Y1-Y1 in (A), and (C) is a long view. The perspective view of the temperature sensing valve part which has a circular inflow hole, (D) And (E) is a principal part expanded sectional view which shows a process until a temperature sensing valve part cut | disconnects a contamination.

  Embodiments of the present invention will be described with reference to the drawings. The present invention mainly comprises a hydraulic relief valve A, a temperature sensitive relief valve B, an oil circulation circuit 6, an upstream flow path 61, a downstream flow path 62, and an oil pump 9 (see FIGS. 1 and 8). ). The hydraulic relief valve A performs a relief (discharge) operation by the discharge pressure from the oil pump 9. The hydraulic relief valve A includes a valve body 1, an elastic member 2, and a valve housing 3 (see FIGS. 1 and 8).

  The valve body 1 is composed of a cylindrical small-diameter portion 11 and a large-diameter portion 12, and both are integrally formed in the axial direction and in the axial direction. The small diameter portion 11 is formed to be long in the axial direction so as to be substantially columnar, and the large diameter portion 12 is formed in a flat cylindrical shape. An end surface (an upper end surface of the valve body 1 in FIG. 1) at one end in the axial direction of the small diameter portion 11 is a pressure receiving surface 11a.

  A cylindrical protrusion 14 is formed at the other axial end of the large diameter portion 12 (the lower end surface of the valve body 1 in FIG. 1). The protrusion 14 serves to support the elastic member 2 such as a coil spring, and the protrusion 14 is inserted into the elastic member 2 as a coil spring.

  The valve housing 3 includes a small diameter valve chamber 31 and a large diameter valve chamber 32. The small diameter valve chamber 31 is a valve chamber in which the small diameter portion 11 of the valve body 1 slides, and the large diameter valve chamber 32 is a valve chamber in which the large diameter portion 12 slides. In the small-diameter valve chamber 31, only the small-diameter portion 11 slides, but in the large-diameter valve chamber 32, the small-diameter portion 11 enters together with the large-diameter portion 12.

  In the small diameter valve chamber 31 of the valve housing 3, a first relief inflow portion 33 is formed at the axial end portion (the upper end portion of the valve housing 3 in FIG. 1). The first relief inflow portion 33 is disposed between the valve housing 3 and the top of the valve body 1 and serves to allow oil to flow into the hydraulic relief valve A.

  Further, a first relief outflow portion 34 is formed at an appropriate position between the axially intermediate portion of the small diameter valve chamber 31 of the valve housing 3 and the boundary portion with the large diameter valve chamber 32. The first relief outflow portion 34 is opened and closed by reciprocating sliding of the small diameter portion 11 of the valve body 1. When the first relief outflow portion 34 is opened, the oil is discharged from the valve housing 3 to the outside and the oil is sucked into the oil pump 9. It serves to return to the side or the oil pan 101. The hydraulic relief valve A is not limited to the one described above, and any hydraulic relief valve may be used as long as it operates by sensing the oil pressure.

  In addition, two first relief outflow portions 34 may be provided. In this case, the two first relief outflow portions 34 and 34 are arranged at a predetermined interval in the moving direction of the valve body 1. By providing two first relief outflow portions 34, finer hydraulic control is possible.

  The temperature-sensitive relief valve B has first and second embodiments, and will be described first from the first embodiment. The temperature-sensitive relief valve B includes a temperature-sensitive valve body 4 and a temperature-sensitive housing 5. The temperature sensing valve body 4 includes a temperature sensing valve unit 41 and a temperature sensing drive unit 42, and the temperature sensing drive unit 42 detects the temperature of the oil and slides the temperature sensing valve unit 41 within the temperature sensing housing 5. Move. A second relief inflow portion 51 and a second relief outflow portion 52 are formed in the temperature sensitive housing 5.

  As an example of a specific structure of the temperature sensitive valve portion 41, a communication passage 41a is formed in a substantially cylindrical shape, and a circular groove is formed along the outer periphery at an intermediate position in the axial direction of the cylindrical shape. Has been. The communication passage 41 a reaches the position of the second relief inflow portion 51 and the second relief outflow portion 52 when the temperature sensing valve portion 41 moves in the temperature sensing housing 5 by the temperature sensing drive portion 42. By doing so, the second relief inflow portion 51 and the second relief outflow portion 52 communicate with each other and the oil is circulated (see FIG. 10).

  Here, the temperature-sensitive relief valve provided with the conventional temperature-sensitive sensor is designed with the intention of the difference in change of the oil temperature from the start to the end of the operation being about 5 ° C to 10 ° C. However, the temperature-sensitive relief valve B according to the present invention further increases the temperature difference from the start to the end of the operation for oil relief, specifically about 50 ° C. (about 40 ° C. if necessary). The operation starts at about 120 ° C (about 140 ° C if necessary), and the difference in oil temperature is about 70 ° C (or about 100 ° C). It is.

  As described above, the temperature range in which the operation for performing oil relief of the temperature-sensitive relief valve B in the present invention is remarkably expanded as compared with the conventional one. And the temperature sensing valve part 41 can move gradually toward the terminal part from the start end of a moving direction toward the high oil temperature from low oil temperature. That is, instead of the conventional ON / OFF control, the control can follow the oil temperature over a wide oil temperature range.

  The temperature sensing drive unit 42 serves as a temperature sensor. Specifically, it is a cylinder-type member and includes a cylinder 42a and a piston 42b. A temperature sensor 42c is provided in the cylinder 42a. Thermo-wax is used as the temperature sensor 42c. Specifically, the cylinder 42a is provided with a portion filled with thermowax (see FIG. 1), and expands and contracts according to the temperature detected by the thermowax, and the piston 42b moves relative to the cylinder 42a. It performs expansion and contraction.

  By adopting a configuration in which thermowax is used for the temperature sensor 42c, the apparatus can be made inexpensive. Further, the thermowax can be expanded and contracted substantially accurately, so that the temperature-sensitive valve element 4 can operate more smoothly.

  As described above, the temperature-sensitive relief valve B can be controlled to follow the oil temperature over a wide oil temperature range, not the conventional ON / OFF control. The temperature-sensing valve body 4 of the temperature-sensitive relief valve B gradually changes in expansion / contraction amount with respect to the change in oil temperature. That is, the temperature sensing valve body 4 closes so that the opening of the second relief inflow portion 51 and the second relief outflow portion 52 gradually narrows as the oil temperature of the oil rises. In this configuration, the amount of oil flowing through the inflow portion 51 and the second relief outflow portion 52 can be gradually reduced.

  Further, when the oil temperature is lowered, the opening is gradually increased from the fully closed state of the second relief inflow portion 51 and the second relief outflow portion 52, and the amount of oil relief is gradually increased. It is made to be able to. That is, the temperature sensing drive unit 42 that controls the operation of the temperature sensing valve body 4 simply changes the second relief inflow portion 51 and the second relief outflow portion 52 between the fully open state and the fully closed state according to the oil temperature. It is not the structure which makes any one state.

  In the present invention, in addition to the fully closed and fully opened states of the second relief inflow portion 51 and the second relief outflow portion 52, the configuration can be such that the state is in the middle of opening and closing. That is, the temperature-sensitive valve body 4 is configured such that the opening areas of the second relief inflow portion 51 and the second relief outflow portion 52 can be optimally adjusted according to the oil temperature of the oil.

  With such a structure, the temperature sensing valve portion 41 reciprocates in the temperature sensing housing 5 due to a change in oil temperature. At this time, when the oil has a low oil temperature, the second relief inflow portion 51 and the second relief outflow portion 52 are fully opened, and the relief amount of oil passing through the temperature-sensitive relief valve B is maximized. Further, when the oil has a high oil temperature, the second relief inflow portion 51 and the second relief outflow portion 52 are fully closed, and the oil relief by the temperature sensitive relief valve B is not performed.

  When the oil temperature is medium oil temperature, the opening area of the second relief inflow portion 51 and the second relief outflow portion 52 is slightly smaller than that in the fully open state near the low oil temperature within the range of the intermediate oil temperature. . Further, near the high oil temperature within the middle oil temperature range, the second relief inflow portion 51 and the second relief outflow portion 52 are not fully closed but are opened with a small opening area.

  That is, when the oil temperature is medium and low, the oil relief amount can be increased when the oil temperature is low, and the oil relief amount can be reduced when the oil temperature is high. In this way, when the oil temperature of the oil is medium oil temperature, the oil relief amount can be adjusted steplessly to a large or small level.

  The thermosensitive drive unit 42 uses thermowax as the temperature sensor 42c. However, the temperature sensitive drive unit 42 is not limited to this, and for example, a shape memory alloy, bimetal, or the like may be used. . The thermowax, shape memory alloy, bimetal, etc. used for the temperature sensitive drive unit 42 do not use any electrical system, and in the present invention, these are referred to as non-electronic control components. By using non-electronically controlled parts for the temperature sensitive drive part 42 in the temperature-sensitive relief valve B, no electronic control parts are used, so that stable operation is not affected by the failure of the electrical system. can do.

  Further, the temperature sensing valve 41 is an auxiliary elastic such as a coil spring that applies a load in a direction opposite to the load of the temperature sensing drive unit 42 in a direction in which the second relief inflow portion 51 and the second relief outflow portion 52 are always in communication. A member 43 is provided.

  As described above, the non-electronic control component is used for the temperature sensor 42c of the temperature-sensitive relief valve B, and thus no electronic control component is used. Can be operated stably.

  The oil pump 9 is an internal gear pump, and includes a pump housing 91, an inner rotor 95, and an outer rotor 96. A rotor chamber 92 is formed in the pump housing 91, and a suction port 93 and a discharge port 94 are formed. In the pump housing 91, the side where the suction port 93 is formed is referred to as a suction portion 9A, and the side where the discharge port 94 is formed is referred to as a discharge portion 9B. The suction section 9A has a configuration including the suction port 93 and the suction port of the suction port 93, and the discharge section 9B has a configuration including the discharge port 94 and the discharge port 94. ing.

  An inner rotor 95 and an outer rotor 96 are arranged in the rotor chamber 92. The inner rotor 95 has outer teeth and the outer rotor 96 has inner teeth. The inner rotor 95 is disposed in the outer rotor 96 and the inner rotor 95 is driven to rotate together with the outer rotor 96. Then, the oil sucked from the suction port 93 is discharged from the discharge port 94.

  The oil pump 9 is incorporated in the oil circulation circuit 6. The oil circulation circuit 6 supplies lubricating oil to an engine E such as an automobile by an oil pump 9. In the oil circulation circuit 6, the flow path from the discharge part 9B of the oil pump 9 to the engine E is referred to as an upstream flow path 61, and the flow path from the engine E to the suction part 9A of the oil pump 9 is referred to as a downstream flow path 62. Called. Further, an oil pan 101 may be provided in the downstream flow path 62 and may be configured to communicate with the suction portion 9A of the oil pump 9 via the oil pan 101.

  A relief flow path 7 is provided between the oil pump 9 and the engine E, that is, between an intermediate portion of the upstream flow path 61 of the oil circulation circuit 6 and the suction portion 9A of the oil pump 9. In the relief flow path 7, the hydraulic relief valve A and the temperature-sensitive relief valve B are provided in parallel.

  There are two embodiments of the configuration of the relief flow path 7. In the first embodiment, the relief flow path 7 is branched through the first branch portion 7 a at a position closer to the oil pump 9 from the upstream flow path 61. The first relief branch flow path 71 is divided into a second relief branch flow path 72 that branches through the second branch portion 7b at a position closer to the engine E side (see FIG. 1).

  The first relief branch flow path 71 and the second relief branch flow path 72 are parallel flow paths, and a hydraulic relief valve A is provided in the first relief branch flow path 71, and the second relief branch flow path 72. The temperature-sensitive relief valve B is provided in this configuration, and the hydraulic relief valve A and the temperature-sensitive relief valve B are arranged in parallel by adopting such a configuration.

  The upstream flow path at the position where the hydraulic relief valve A is provided in the first relief branch flow path 71 is referred to as the first upstream branch flow path 71a of the first relief branch flow path 71, and the downstream flow path is defined as This is referred to as a first downstream branch flow path 71b. Then, the first relief inflow portion 33 of the hydraulic relief valve A and the first upstream branch passage 71a are connected, and the first relief outflow portion 34 and the first downstream branch passage 71b are connected (see FIG. 1). ).

  Similarly, the upstream flow path at the position where the temperature-sensitive relief valve B is provided in the second relief branch flow path 72 is referred to as the second upstream branch flow path 72a of the second relief branch flow path 72, and the downstream side The flow path is referred to as a second downstream branch flow path 72b. And the 2nd relief inflow part 51 of the temperature sensitive relief valve B and the said 2nd upstream branch flow path 72a are connected, and the 2nd relief outflow part 52 and the said 2nd downstream branch flow path 72b are connected (FIG. 1). reference).

  Both the first relief branch flow path 71 and the second relief branch flow path 72 can send oil to the suction portion 9A side of the oil pump 9 via the oil pan 101. Further, as a second embodiment of the relief flow path 7, there is provided one upstream shared flow path 73 that communicates from an intermediate position of the upstream flow path 61 of the oil circulation circuit 6 to the suction portion 9 </ b> A side of the oil pump 9, An upstream bifurcated branch portion 7c is provided from the upstream shared flow path 73, and a first relief branch flow path 71 and a second relief branch flow path 72 are provided in parallel from the upstream bifurcated branch section 7c (see FIG. 8).

  A hydraulic relief valve A is provided on one side of the first relief branch passage 71 and the second relief branch passage 72, and a temperature-sensitive relief valve B is provided on the other side. A downstream bifurcating junction 7d is provided at the downstream end of the first relief branching channel 71 and the second relief branching channel 72, and a downstream shared channel 74 is provided from the downstream bifurcating junction 7d. The downstream shared flow path 74 communicates with the suction portion 9A of the oil pump 9 via the oil pan 101.

  Thus, in the second embodiment of the relief flow path 7, the first relief branch flow path 71 and the second relief branch flow path 72 are formed so as to be bifurcated between the upstream end portion and the downstream end portion. The hydraulic relief valve A and the temperature-sensitive relief valve B are arranged so as to be in parallel with each other.

  In the upstream flow path 61 of the oil circulation circuit 6 of the first embodiment, the hydraulic relief valve A is provided at a position closer to the oil pump 9 side, and the temperature-sensitive relief valve B is provided closer to the engine E side. It is preferably provided at a position immediately upstream or immediately upstream of the main gallery of the engine E. Accordingly, the temperature-sensitive relief valve B can be controlled by an oil temperature that is closer to the oil temperature of the main gallery of the engine E, and accurate control can be performed.

  Although not shown, the engine E includes a cylinder head and a cylinder block. In the cylinder block, a main gallery (that is, an oil passage provided in the engine E) which is the most downstream portion of the upstream flow path 61 is provided. Is formed.

  The temperature-sensitive relief valve B may be incorporated in the cylinder block so as to be integrated with the engine E, and the hydraulic relief valve A is configured so that the oil pump 9 is integrated and is incorporated in the pump housing 91. Sometimes. Even in such a configuration, the hydraulic relief valve A and the temperature-sensitive relief valve B are in parallel in the relief flow path 7.

  The basic flow of oil in the oil circulation circuit 6 will be described. The oil discharged from the discharge portion 9B side of the oil pump 9 flows into the oil circulation circuit 6, and the oil as lubrication and cooling is supplied to the engine E through the upstream flow path 61. Then, the oil circulated in the engine E flows through the downstream flow path 62 and returns to the suction portion 9A side of the oil pump 9 again. At this time, when the oil pan 101 is provided between the downstream flow path 62 and the suction portion 9A of the oil pump 9, the oil pan 101 is stored in the oil pan 101 (see FIG. 1).

  Next, the relief operation of the relief device according to the present invention will be described. As described above, the hydraulic relief valve A and the temperature-sensitive relief valve B are arranged in parallel in the relief flow path 7 in which the oil relief is performed, and each performs a relief operation independently. Then, each of the hydraulic relief valve A and the temperature sensitive relief valve B operates individually by increasing the oil discharge pressure from the oil pump 9 or by increasing or decreasing the oil temperature.

  Hereinafter, the oil relief operation will be described in the following cases according to the oil temperature level and the engine E rotation speed level. Here, when the oil temperature of the oil is low oil temperature is about 50 ° C. or less, the low oil temperature has a temperature range lower than about 40 ° C. to about 60 ° C. The intermediate oil temperature is in the range of about 40 ° C. to about 130 ° C., but in the present invention, it is about 50 ° C. to about 120 ° C. Moreover, high oil temperature shall be about 120 degreeC or more. Further, in FIGS. 1 to 8, arrows described along the oil circulation circuit 6 and the relief flow path 7 indicate the flow of oil and its direction.

  The oil relief operation when the oil is at a low oil temperature and the engine E is in the low speed range is as follows (see FIG. 2). The temperature-sensitive relief valve B performs oil relief, and the hydraulic relief valve A does not perform oil relief. As a specific example of such a situation, for example, immediately after the start of the engine E, the oil is not sufficiently warmed. Therefore, the oil has a low oil temperature and the oil has a high viscosity.

  Since the hydraulic pressure is low, the relief operation by the hydraulic relief valve A is not performed. On the other hand, when the temperature-sensitive relief valve B has a low oil temperature, the temperature-sensitive valve body 4 is opened so that the second relief inflow portion 51 and the second relief outflow portion 52 communicate with each other. Oil flows through the relief branch channel 72 and relief is performed.

  The oil relief operation when the oil is at a low oil temperature and the engine E is in the medium speed range and the high speed range is as follows (see FIG. 3). Both the temperature-sensitive relief valve B and the hydraulic relief valve A perform oil relief. That is, when the engine E is in the middle rotation speed range and the high rotation speed range, the oil pressure also increases, so that the hydraulic pressure relief valve A operates and relief by hydraulic pressure is performed.

  The oil relief operation when the oil is at medium oil temperature and the engine E is in the low engine speed range is as follows (see FIG. 4). The temperature-sensitive relief valve B performs oil relief so that the amount of oil relief increases near the low oil temperature within the range of the intermediate oil temperature (see FIG. 4A). Further, the amount of communication between the second relief inflow portion 51 and the second relief outflow portion 52 is reduced so that the amount of oil relief decreases near the high oil temperature within the intermediate oil temperature range. The hydraulic relief valve A does not perform oil relief because the engine E is in a low rotational speed range and the oil pressure is low (see FIG. 4B).

  The oil relief operation when the oil is at a medium oil temperature and the engine E is in the medium speed range and the high speed range is as follows (see FIG. 5). The temperature-sensitive relief valve B performs oil relief so as to increase the amount of oil relief at a low oil temperature in the middle oil temperature range (see FIG. 5A). In addition, the oil is relieved so that the amount of oil relief decreases near the high oil temperature within the medium oil temperature range. The hydraulic pressure relief valve A performs oil relief because the oil pressure also increases when the engine E has a middle rotation speed range and a high rotation speed range (see FIG. 5B).

  The oil relief operation when the oil is at a high oil temperature and the engine E is in the low engine speed range is as follows (see FIG. 6). The temperature-sensitive relief valve B is fully closed at a high oil temperature and does not perform oil relief. Further, the oil pressure relief valve A does not perform oil relief because the engine E is in a low rotation speed range and the oil pressure is low.

  The oil relief operation when the oil is at a high oil temperature and the engine E is in the medium speed range and the high speed range is as follows (see FIG. 7). The temperature-sensitive relief valve B is fully closed at a high oil temperature and does not perform oil relief. Further, since the hydraulic relief valve A has a high discharge pressure from the oil pump 9, oil relief is performed.

  As described above, in the relief device according to the present invention, depending on the low oil temperature, medium oil temperature, high oil temperature of the oil, and the respective conditions in the low rotation speed range, medium rotation speed range, and high rotation speed range of the engine E. Appropriate oil relief is performed. As a result, as shown in the graph showing the hydraulic characteristics of the present invention (see FIG. 9), the hydraulic characteristics of the present invention are equivalent to the high oil temperature regardless of whether the oil temperature is low or medium. Low hydraulic characteristics can be achieved.

  The main configuration of the present invention will be described below. The relief flow path 7 is provided so that the first relief branch flow path 71 and the second relief branch flow path 72 are in parallel, and the first relief branch flow path 71 is provided with a hydraulic relief valve A, A temperature-sensitive relief valve B is provided in the second relief branch flow path 72.

  The sensor (temperature sensor 42c) for sensing the oil temperature of the temperature relief valve B is a non-electronic component. Further, the temperature-sensitive relief valve B is a valve that moves by sensing the oil temperature, and the operation of the temperature-sensitive valve body 4 gradually and smoothly moves with respect to changes in the oil temperature.

  As described above, in the relief device of the present invention, when the oil temperature is low, the temperature-sensitive relief valve B is subjected to oil relief, and when the oil temperature is medium, the temperature-sensitive relief valve B is closer to the lower oil temperature and oil. The relief valve B is characterized in that the relief valve B does not perform oil relief when the oil temperature is high. It is a thing.

  In the embodiment of the present invention, the oil pump 9 is an internal gear pump. However, the present invention is not limited to this, and an external gear pump, a vane pump, or the like may be used. That is, any type of pump can be used as long as it is a hydraulic pressure generating source.

  Furthermore, in the embodiment of the present invention, the temperature sensor 42c is arranged adjacent to or partially into the upstream flow path 61 in order to make the control by the temperature sensor 42c more accurate and more responsive. Good to be done. In the second embodiment of the present invention, the number of parts can be reduced by forming the valve housing 3 and the temperature sensitive housing 5 integrally by casting or the like.

  Next, specific configurations of the hydraulic relief valve A and the temperature-sensitive relief valve B will be described. Here, the hydraulic relief valve A and the temperature-sensitive relief valve B will be described as a structure of the oil pump 9 that is incorporated in the pump housing 91 and is integrally combined with the hydraulic relief valve A and the temperature-sensitive relief valve B. (See FIG. 11).

  In order to make the explanation easy to understand, a vertical direction is set for the pump housing 91. The vertical direction of the pump housing 91 is the vertical direction when the direction in which the inner rotor 95 and the outer rotor 96 rotate is a vertical plane in FIG. The vertical direction is described in FIG. In the figure, reference numeral 98 denotes a drive shaft, and the drive shaft 98 is rotated by the power of the engine E to rotate the inner rotor 95 and the outer rotor 96.

  As described above, the hydraulic relief valve A includes the valve body 1, the elastic member 2, and the valve housing 3. The temperature sensitive relief valve B is provided in the upstream flow path 61. The upstream flow path 61 is a flow path that follows the discharge portion 9B of the pump housing 91. Here, the upstream flow path 61 is configured to be integrally formed in the pump housing 91 (FIG. 11). (See (A)).

  Thus, the part formed in the pump housing 91 in the upstream flow path 61 is referred to as an in-housing upstream flow path 611. The in-housing upstream flow path 611 is a flow path constituting the discharge portion 9B, and is an oil path from the discharge port 94 to a discharge port for discharging oil to the outside of the pump housing 91. Further, the in-housing upstream flow path 611 is a flow path extending in the horizontal direction with respect to the vertical direction of the pump housing 91 (see FIG. 11A).

  A valve housing 3 is formed on the lower end surface of the upstream flow path 611 in the housing, and the valve body 1 and the elastic member 2 are mounted on the valve housing 3. The valve body 1 is always elastically biased upward by the elastic member 2. Has been. The upper end portion of the valve housing 3 is an opening 3a at a portion that intersects the upstream flow path 611 in the housing. The opening 3 a is a portion used as a portion corresponding to the relief flow path 7 and the first relief inflow portion 33.

  That is, the first branch portion 7a of the relief channel 7 and the upstream branch channel 71a of the first relief branch channel 71 are collectively provided in the opening 3a. The inner diameter of the opening 3a portion of the valve housing 3 is formed to be smaller than the outer diameter of the valve body 1, and the valve body 1 is configured not to protrude upward from the opening 3a.

  A first relief outflow portion 34 is formed at an appropriate position on an inner peripheral side surface 3 b (not shown) of the valve housing 3. The first relief outflow portion 34 is connected to the suction port 93, and the relief oil flowing out from the first relief outflow portion 34 is transferred to the suction port 93 by the first downstream branch flow passage 71 b of the first relief branch flow passage 71. It is sent. The first downstream branch flow path 71 b is integrally formed in the pump housing 91. Two first relief outflow portions 34 are provided in parallel along the left-right direction of the valve housing 3 (see FIG. 11A).

  As described above, the temperature-sensitive relief valve B includes the temperature-sensitive valve body 4 and the temperature-sensitive housing 5. The temperature sensitive relief valve B is provided adjacent to the upstream flow path 611 in the housing and adjacent to the hydraulic relief valve A on the downstream side. The temperature-sensitive housing 5 is formed so as to branch from the upstream flow path 611 in the housing.

  The temperature-sensitive housing 5 is formed along the vertical direction of the pump housing 91, and is formed in a cylindrical space by a cylindrical inner peripheral side surface 5b and a circular bottom surface 5c. An upper end portion of the temperature-sensitive housing 5 is an opening 5a at a portion that intersects the upstream flow path 611 in the housing.

  The opening 5 a is a portion used as a portion corresponding to the relief flow path 7 and the second relief inflow portion 51. That is, the second branch portion 7b of the relief channel 7 and the second upstream branch channel 72a of the second relief branch channel 72 are provided together in the opening 5a. A second relief outflow portion 52 is formed at an appropriate position on the inner peripheral side surface 5b.

  The second relief outflow part 52 is connected to the oil pan 101 or the suction port 93, and the relief oil flowing out from the second relief outflow part 52 is supplied by the second downstream branch flow path 72 b of the second relief branch flow path 72. It is fed into the oil pan 101 or the suction port 93. The second downstream branch flow path 72b may be integrally formed in the pump housing 91.

  The temperature sensing valve portion 41 of the temperature sensing valve body 4 is formed by a cylindrical portion 411 and a top portion 412. The top portion 412 is integrally formed at the upper end of the cylindrical portion 411, and has a substantially cylindrical cup shape (FIG. 11). reference). The top portion 412 is formed with a connecting portion 413 into which the shaft end of the piston 42b of the temperature sensitive driving portion 42 is inserted and connected. The connecting portion 413 is formed in a cylindrical shape into which the piston 42b can be inserted (see FIGS. 11B and 11C).

  An inflow hole 414 is formed in the top portion 412 [see FIG. 11C and the like]. One or more inflow holes 414 are formed at appropriate locations around the connection portion 413. The inflow hole 414 serves to feed oil into the temperature sensitive housing 5 via the temperature sensitive valve portion 41.

  The inflow hole 414 has various shapes. The first shape is an ellipse (see FIG. 11C) or an ellipse. In the case of an ellipse, the overall shape is formed in a substantially arc shape. As the second shape of the inflow hole 414, there is a shape formed in a circular shape. When two inflow holes 414 are formed, it is preferable that the two inflow holes 414 and 414 are formed in point-symmetric positions with the connection portion 413 as the center. The inflow hole 414 has a total opening area smaller than the opening area of the second relief outflow portion 52 (see FIGS. 11D and 11E).

  When the inflow hole 414 of the temperature sensing valve 41 and the second relief outflow part 52 are arranged in series, the relief amount is the area of the inflow hole 414 and the second relief outflow part 52 whose opening area is smaller. Is roughly determined. When the oil temperature is low, the second relief outflow portion 52 is fully open.

  Therefore, when the oil temperature is low, the relief amount can be determined only by the total area of the inflow hole 414 of the temperature sensing valve portion 41. Further, when the oil temperature is high, the second relief outflow portion 52 in the temperature sensitive housing 5 is fully closed by the temperature sensitive valve portion 41, so that the hydraulic pressure is not reduced by the temperature sensitive relief valve B. I can do it.

  As described above, the temperature-sensitive drive unit 42 includes the cylinder 42a and the piston 42b, and the cylinder 42a is filled with thermowax. The thermo wax expands and contracts depending on the detected oil temperature, and performs an expansion / contraction operation by the piston 42b protruding and retracting with respect to the cylinder 42a. The part for detecting the oil temperature is defined as a temperature sensor 42c.

  The temperature-sensitive drive unit 42 is mounted at a position that intersects with the upstream flow path 611 in the housing and corresponds to a location where the temperature-sensitive housing 5 is formed (see FIGS. 11A and 11B). A mounting portion 97 to which the temperature sensitive driving unit 42 is mounted is formed in the in-housing upstream flow path 611. Specifically, a mounting portion 97 is formed as a gap that allows the temperature-sensitive drive unit 42 to be disposed at a position immediately above the position where the temperature-sensitive housing 5 is formed in the upstream flow path 611 in the housing [ (See FIGS. 11A and 11B).

  The temperature sensitive drive unit 42 is mounted on the mounting unit 97 via the holder 44. The holder 44 has a holding portion 44 a that holds the temperature-sensitive drive portion 42 and an external screw 44 b, and an inner screw 97 a is formed in the mounting portion 97. Then, the cylinder 42a of the temperature sensitive drive unit 42 is attached to the holding part 44a, the outer screw 44b and the inner screw 97a are screwed together, and the temperature sensitive drive unit 42 is attached to the attachment unit 97. The position where the temperature-sensitive housing 5 and the temperature-sensitive drive unit 42 are provided is in the vicinity of the discharge-side end of the upstream flow path 611 in the housing [see FIG. 11A].

  Next, the operation of the temperature sensitive relief valve B will be described. An inflow hole 414 is formed in the top portion 412 of the temperature sensing valve portion 41, and part of the discharged oil flowing through the in-housing upstream flow path 611 always flows into the temperature-sensitive housing 5 from the inflow hole 414. Further, the temperature sensing valve body 4 of the temperature sensing relief valve B is such that the expansion / contraction amount gradually changes with respect to the change in oil temperature, and in the case of a low oil temperature, the piston of the temperature sensing drive unit 42. In 42b, the temperature sensing valve portion 41 is positioned above the temperature sensing housing 5, and the second relief outflow portion 52 is fully opened (see an imaginary line in FIG. 11A).

  Accordingly, at low oil temperature, oil flows through the inflow hole 414 and the second relief outflow portion 52, and the discharge oil is always relieved. The inflow hole 414 formed in the top portion 412 is not formed in the outer periphery of the top portion 412 but is formed in a region near the center of the top portion 412 and in the axial direction. That is, the inflow hole 414 does not intersect the outer periphery of the top portion 412 and is formed at a position separated from the outer periphery.

  This is because the inflow hole 414 does not have a configuration in which a part of the inflow hole 414 intersects with the outer peripheral edge of the top 412 and becomes a groove on the side of the cylindrical part 411. As a result, when the temperature sensing valve portion 41 is mounted on the piston 42b of the temperature sensing drive portion 42 and the temperature sensing valve portion 41 is inserted into the temperature sensing housing 5, the second relief outflow portion 52 in the temperature sensing housing 5 is provided. Can be mounted at any angle on the horizontal plane with the piston 42b as the central axis without considering the position or phase, and the assembling work is simplified. Furthermore, it is not necessary to prepare a special jig, an angle (phase) measuring device, or the like in this assembling operation.

  As the oil temperature of the oil in the upstream flow path 611 in the housing rises, the temperature sensing valve portion 41 slides downward in the temperature sensing housing 5 and gradually narrows the opening with the second relief outflow portion 52. go. As a result, the amount of oil flowing into the second relief outflow portion 52 gradually decreases, and the amount of oil relief becomes small.

  When the oil temperature further rises to a high oil temperature, the temperature sensing valve portion 41 slides downward to completely close the second relief outflow portion 52 (fully closed), and from the second relief outflow portion 52. No oil relief occurs (see FIG. 10E). When the oil is at a high oil temperature, the hydraulic relief valve A opens the first relief outflow portion 34 to perform oil relief.

  The pump housing 91 includes a housing body 911 and a cover 912. Normally, the main part constituting the pump, such as the rotor chamber 92, the suction port 93, and the discharge port 94, is provided on the housing main body 911 side, and the cover 912 is attached to the housing main body 911, so that the oil pump 9 is configured. In addition, either the housing main body 911 or the cover 912 may be integrally formed with a casing such as an engine.

  Next, the oil circulation circuit 6 is provided with an oil pump for sending oil to the engine, and the contamination d exists. This contamination d (Contami) is an abbreviation for Contamination, and is a general term for foreign matter, sludge, cutting chips, abrasion powder, and the like, and the contamination d flows through the oil circulation circuit 6. Contamination d flows through the oil circulation circuit 6 and is removed by the oil filter, but some of the contamination may enter the temperature-sensitive relief valve B. It is extremely difficult to prevent this.

  Contamination d flowing in the oil circulation circuit 6 may enter the temperature-sensitive relief valve B, which may be an obstacle to the temperature-sensitive valve unit 41 moving through the temperature-sensitive housing 5 via the temperature-sensitive drive unit 42. Specifically, in the temperature-sensitive relief valve B, if the second relief inflow portion 51 and the second relief outflow portion 52 of the temperature-sensitive housing 5 are open at low oil temperature and medium oil temperature, the contamination d is It enters from the second relief inflow portion 51 of the temperature-sensitive housing 5 and is discharged as it is from the second relief outflow portion 52, and there is no particular problem (see FIG. 10A).

  However, when the temperature of the oil rises from a low oil temperature and changes from a medium oil temperature to a high oil temperature, the temperature sensing valve 41 moves in the temperature sensing housing 5, and the second relief inlet 51 and the second relief are moved. The outflow part 52 is closed from the open state and the operation starts. At this time, the contamination d may be sandwiched between the temperature-sensitive valve body 4, the second relief inflow portion 51, and the second relief outflow portion 52 (see FIG. 10B). Then, the contamination d becomes an obstacle, the movement of the temperature sensing valve unit 41 is stopped, the temperature sensing valve unit 41 cannot operate properly, and the second relief inflow portion 51 and the second relief outflow portion 52 are closed. There is a risk that it cannot be cut.

となる。 Therefore, in the temperature-sensitive relief valve B, the thermo-actuating load F of the temperature-sensitive drive unit 42 that generates power for moving the temperature-sensitive valve unit 41 is set to be larger than the cutting load T for cutting the contamination d. It is what. The cutting load T is a load required to cut the contamination d. The cutting load T may be referred to as a shear load T.
That is,

It becomes.

  In the temperature-sensitive relief valve B of the first embodiment, the thermo-actuating load F of the temperature-sensitive drive unit 42 is such that the communication passage 41a of the temperature-sensitive valve unit 41 is in the second relief inflow portion 51 and the second relief outflow portion 52. When the contamination d is sandwiched and passed between one or both of the communication passage 41a and the second relief inflow portion 51 and the communication passage 41a and the second relief outflow portion 52, the thermo-actuating load F is This is configured to be set larger than the cutting load T for cutting the contamination d.

  With such a configuration, when the contamination d is sandwiched between the edge 41a ′ of the communication passage 41a of the temperature sensing valve portion 41 and the second relief inflow portion 51 and the second relief outflow portion 52, the contamination d Is subjected to a cutting load T (see FIGS. 10B and 10E), and further, the temperature sensing valve portion 41 moves, so that the edge 41a ′ of the temperature sensing valve portion 41 and the second relief inflow portion 51 and The contamination d sandwiched between the edge 41a ′ of the temperature-sensitive valve portion 41 and the second relief outflow portion 52 is subjected to a load exceeding the cutting load T by the thermo-actuating load F, and bites the contamination d. .

  That is, the contamination d is cut (sheared) [see FIG. 10C]. As a result, even if the contamination d becomes an obstacle, the temperature-sensing valve unit 41 can cut it and continue a predetermined proper movement operation within the temperature-sensing housing 5 [FIG. 10 (A) to FIG. (See (C) and (D) to (F)).

  Here, as described above, the temperature sensing valve portion 41 of the temperature sensing relief valve B includes the auxiliary elastic member 43 such as a coil spring that applies a load in a direction to quickly return the temperature sensing driving portion 42 to the initial position. . The auxiliary elastic member 43 is a member that constitutes the temperature-sensitive relief valve B, but if it is a type that can reciprocate the temperature-sensitive valve portion 41 within the temperature-sensitive housing 5 only by the temperature-sensitive drive portion 42, The auxiliary elastic member 43 is not necessary.

  Therefore, the thermo-actuating load F refers to a load for operating the temperature sensing valve unit 41 regardless of the presence of the auxiliary elastic member 43 by the temperature sensing drive unit 42 of the temperature sensing relief valve B. That is, when the auxiliary elastic member 43 is included in the temperature sensitive relief valve B, the thermo-actuating load F is set in a state where the auxiliary elastic member 43 is included, and the auxiliary elastic member 43 is not included. In this case, it is assumed that the thermo operating load F is set in a state where the auxiliary elastic member 43 is not included.

  In the temperature-sensitive relief valve B of the first embodiment, as described above, the second relief inflow portion 51 and the second relief outflow portion 52 are provided for the temperature-sensitive housing 5. Therefore, the temperature sensing valve unit 41 sandwiches the contamination d in one of the second relief inflow portion 51 and the second relief outflow portion 52, or in both the second relief inflow portion 51 and the second relief outflow portion 52. Contamination d may be caught (see FIG. 10B).

  Therefore, in the first embodiment, when the contamination d is sandwiched between the second relief inflow portion 51 and the second relief outflow portion 52, the thermo-actuating load F can cut both the contaminations d and d. It was supposed to be. As a result, even when the contamination d is sandwiched between only one of the second relief inflow portion 51 and the second relief outflow portion 52, it can be sufficiently cut.

  Here, an experimental example of the numerical values of the thermo-actuating load F and the cutting load T of the contamination d will be described. The size of the contamination d is a length L0.9 mm and a width W0.14 mm. The cutting load T at this time was 18.9N. Accordingly, the thermo operating load F is assumed to be larger than 18.9N. For example, the maximum load of the thermo operating load F is 110N.

  Next, cutting of contamination d by the temperature-sensitive relief valve B of the second embodiment will be described. In the second embodiment, the temperature sensing valve portion 41 has an inflow hole 414, and the temperature sensing housing 5 has a second relief outflow portion 52 formed in the inner peripheral side surface 5b. As described above, in the second embodiment, the portion corresponding to the second relief inflow portion 51 is the opening 5a of the temperature-sensitive housing 5, but the opening 5a is not closed by the temperature-sensitive valve portion 41, and the inflow Oil enters the temperature-sensitive housing 5 from the hole 414.

  In the temperature-sensitive relief valve B of the second embodiment, only the second relief outflow portion 52 is opened and closed by the movement of the temperature-sensitive valve portion 41, and oil relief is executed or stopped. The relief operation by the temperature-sensitive relief valve B of the second embodiment is substantially the same as the temperature-sensitive relief valve B of the first embodiment.

  In the temperature-sensitive relief valve B of the second embodiment, as described above, only the second relief outflow part 52 is opened and closed with respect to the temperature-sensitive housing 5 by the temperature-sensitive valve part 41. Therefore, the contamination d is sandwiched only between the temperature sensing valve portion 41 and the second relief outflow portion 52 side. Therefore, in the second embodiment, it is assumed that the thermo-actuating load F exceeds the cutting load T when the contamination d is sandwiched only between the temperature sensing valve portion 41 and the second relief outflow portion 52 side.

  Conventionally, in order to prevent contamination d from entering the temperature-sensitive relief valve B in the oil circulation circuit 6, the temperature-sensitive relief valve B has to be installed downstream from the installation position of the oil filter. There was a limit. However, according to the present invention, the contamination d is cut by the temperature sensing valve 41, the second relief inflow portion 51, and the second relief outflow portion 52 even if the contamination d enters the temperature sensitive relief valve B. The temperature valve 41 can move, the temperature-sensitive relief valve B can be installed at any position in the oil circulation circuit 6, and the degree of freedom of the installation position of the temperature-sensitive relief valve B is increased. .

A ... Hydraulic relief valve, 1 ... Valve, 3 ... Valve housing, B ... Temperature sensitive relief valve,
DESCRIPTION OF SYMBOLS 4 ... Temperature sensing valve body, 41 ... Temperature sensing valve part, 41a ... Communication path, 414 ... Inflow hole, 42b ... Piston, 42 ... Temperature sensing drive part, 5 ... Temperature sensing housing, 52 ... 2nd relief outflow part,
6 ... Oil circulation circuit, 62 ... Downstream flow path, 9 ... Oil pump, 7 ... Relief flow path,
71 ... 1st relief branch flow path, 72 ... 2nd relief branch flow path, 9A ... suction part,
9B ... discharge part, E ... engine, d ... contamination.

Claims (7)

An oil pump, an upstream flow path provided from the discharge part side of the oil pump to the engine, a hydraulic relief valve that performs oil relief by moving the valve body by oil pressure, and senses the oil temperature And a temperature-sensitive relief valve that relieves oil by opening and closing steplessly, and the hydraulic relief valve and the temperature-sensitive relief valve are arranged in parallel in the upstream flow path, and the temperature-sensitive relief is provided. The valve includes a temperature-sensitive valve body and a temperature-sensitive housing, and the temperature-sensitive valve body includes a temperature-sensitive drive unit and a temperature-sensitive valve unit having a communication path, and the temperature-sensitive drive unit includes an oil temperature by thermo wax. And a temperature relief valve portion connected to the piston. The temperature sensing housing has a second relief inflow portion and a second relief outflow portion formed in an inner peripheral side surface. Part The second relief inlet portion and the second relief outlet portion can be opened and closed by the sliding,
The thermo-actuating load of the temperature sensitive drive unit is such that when the communication path of the temperature sensitive valve unit moves through the second relief inflow portion and the second relief outflow portion, the second relief inflow portion and the second A relief device for an oil circuit of an engine, wherein the relief device is set to be larger than a cutting load for cutting the contamination passing through the relief outflow portion. An oil pump, an upstream flow path provided from the discharge part side of the oil pump to the engine, a hydraulic relief valve that performs oil relief by moving the valve body by oil pressure, and senses the oil temperature And a temperature-sensitive relief valve that relieves oil by opening and closing steplessly, and the hydraulic relief valve and the temperature-sensitive relief valve are arranged in parallel in the upstream flow path, and the temperature-sensitive relief is provided. The valve includes a temperature sensing valve body and a temperature sensing housing, the temperature sensing valve body includes a temperature sensing drive unit and a temperature sensing valve unit, the temperature sensing valve unit having an inflow hole, and the temperature sensing drive. The portion has a piston that appears and disappears when oil temperature is detected by thermowax, the temperature sensing valve portion is connected to the piston, the temperature sensing housing has a second relief outflow portion formed in an inner peripheral side surface, and the temperature sensing Valve part is sliding The serial second relief outlet portion can be opened and closed,
The thermo-actuating load of the temperature-sensitive drive unit is larger than a cutting load for cutting contamination that passes through the second relief outflow part when the temperature sensitive valve unit moves through the second relief outflow part. A relief device for an oil circuit of an engine characterized by being set.   The oil circuit relief device for an engine according to claim 1 or 2, wherein the oil pressure relief is performed on the temperature sensitive relief valve when the oil temperature is low. apparatus.   The oil circuit relief device for an engine according to claim 1 or 2, wherein when the oil temperature is medium, the temperature-sensitive relief valve has a large amount of oil relief near a low oil temperature, and an oil relief amount near a high oil temperature. A relief device for an oil circuit of an engine, characterized in that it is performed so as to be reduced.   3. The engine oil circuit relief device according to claim 1 or 2, wherein the oil pressure relief valve is not subjected to oil relief when the oil temperature is high.   The engine oil circuit relief device according to any one of claims 1, 2, 3, 4, and 5, wherein the temperature-sensitive relief valve is provided in the engine. Relief device.   6. The relief device for an oil circuit of an engine according to any one of claims 1, 2, 3, 4, or 5, wherein the temperature sensitive drive part of the temperature sensitive relief valve is an upstream flow path in the housing of the oil pump. Relief device for engine oil circuit, characterized by

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