JP2016027258A - 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 an oil pump 9 to an engine E, a hydraulic relief valve A having a valve element 1 for opening a first small relief outflow part 341 and a first large relief outflow part 342 in sequence to perform oil relief, and a temperature sensitive relief valve B having a second relief inflow part 51 and a second relief outflow part 52. 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 small opening area Qa of the first small relief outflow part 341 is smaller than a medium opening area Qb of the second relief outflow part 52, and a large opening area Qc of the first large relief outflow part 342 is larger than the medium opening area Qb of 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. The first relief inflow portion, a valve housing having a first small relief outflow portion and a first large relief outflow portion arranged along the axial direction, and the pressure of oil flowing in from the first relief inflow portion are moved. A hydraulic relief valve that opens and relieves oil in the order of the first small relief outflow portion and the first large relief outflow portion by movement of the valve body from the initial state, and a second relief inflow And a temperature-sensitive housing having a second relief outflow portion and a temperature-sensitive valve body, wherein the temperature-sensitive valve body opens and closes the second relief outflow portion in a stepless manner by sensing the oil temperature of oil. With oil relief The hydraulic relief valve and the temperature-sensitive relief valve are arranged in parallel in the upstream flow path, and a small opening area of the first small relief outflow portion is defined by the second relief relief valve. By providing a relief device for an oil circuit of an engine that is smaller than the middle opening area of the outflow portion, and the large opening area of the first large relief outflow portion is larger than the middle opening area of the second relief outflow portion. The above problem has been solved.

  According to a second aspect of the present invention, in the relief device for an oil circuit of the engine according to the first aspect, the first large relief outflow portion is divided into two parts in a direction perpendicular to the axial direction of the valve housing. The above problem was solved by using a relief device for the oil circuit of the engine. According to a third aspect of the invention, there is provided a relief device for an oil circuit of an engine according to the first or second aspect, wherein the first small relief outflow portion is separated into two in a direction orthogonal to the axial direction of the valve housing. As a result, the above problems were solved.

  According to a fourth aspect of the present invention, in the relief device for an oil circuit of an engine according to any one of the first, second, or third aspect, the oil pressure relief is performed on the temperature-sensitive relief valve when the oil temperature is low. The above problem was solved by using a relief device for the oil circuit of the engine. According to a fifth aspect of the invention, in the relief device for an oil circuit of an engine according to any one of the first, second, and third aspects, when the temperature of the oil is medium, the temperature-sensitive relief valve has an oil relief around a low oil temperature. The above-mentioned problems have been solved by providing a relief device for an oil circuit of an engine, which is performed in such a manner that the amount of oil relief is small in the vicinity of a high oil temperature.

  According to a sixth aspect of the present invention, in the relief device for an oil circuit of an engine according to any one of the first, second, or third aspect, when the oil temperature is high, the temperature-sensitive relief valve does not perform oil relief. The above problem was solved by using a relief device for the oil circuit of the engine.

  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.

  Next, a small opening area of the first small relief outflow portion is smaller than a middle opening area of the second relief outflow portion, and a large opening area of the first large relief outflow portion is equal to that of the second relief outflow portion. The structure is larger than the middle opening area. With the above configuration, optimum control can be performed at each of the oil temperature, low oil pressure, and high oil pressure.

  First, in a low hydraulic pressure state, the hydraulic relief valve opens only the first small relief outflow portion by the valve body and does not open the first large relief outflow portion. The small opening area of the first small relief outflow portion is the smallest area, the amount of oil flowing from the upstream flow path to the hydraulic relief valve side is limited to be small, and the relief amount is small.

  On the other hand, since the middle opening area of the second relief outflow portion of the temperature-sensitive relief valve disposed in parallel with the hydraulic relief valve in the upstream flow path is larger than the small opening area of the first small relief outflow portion, The relief amount on the temperature-sensitive relief valve side is larger than the relief amount on the hydraulic relief valve side, and the control amount is larger on the temperature-sensitive relief valve side than on the hydraulic relief valve side. As a result, fuel consumption can be improved.

  Next, at high hydraulic pressure, the hydraulic relief valve has both the first small relief outflow portion and the first large relief outflow portion opened by the valve element. Therefore, the relief amount by the hydraulic relief valve becomes extremely large.

  On the other hand, the middle opening area of the second relief outflow portion is smaller than the large opening area of the first large relief outflow portion, and the first small relief outflow portion is completely open. Becomes larger than the relief amount on the temperature-sensitive relief valve side. Accordingly, it is possible to prevent oil relief (oil pressure is lower than expected), which is larger than expected, mainly at low oil temperatures, and to improve engine durability and reliability. That is, at the oil temperature, low oil pressure, and high oil pressure, the ratio of control of the relief operation by the hydraulic relief valve and the temperature-sensitive relief valve can be changed to maintain a good relief operation.

  In the invention of claim 2, the first large relief outflow portion is separated into two in a direction orthogonal to the axial direction of the valve housing, so that the large opening area is a large area. By separating into two, the strength around the first large relief outflow portion can be maintained. In the invention of claim 3, the first small relief outflow portion is separated into two in the direction orthogonal to the axial direction of the valve housing, so that the relief from the first small relief outflow portion at the time of low hydraulic pressure is achieved. The amount can be set more finely.

  In the invention of claim 4, 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 5, 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 6, when the oil temperature is high, the temperature-sensitive relief valve is configured such that oil relief is not performed. Thereby, cooling and lubrication can be promoted.

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. It is an expansion schematic diagram showing composition of a hydraulic relief valve and a temperature-sensitive relief valve in another embodiment of the present invention. It is an expansion schematic diagram showing relief operation of a hydraulic relief valve and a temperature-sensitive relief valve in a low oil temperature and low oil pressure state of another embodiment of the present invention. It is an expansion schematic diagram showing relief operation of a hydraulic relief valve and a temperature-sensitive relief valve in a low oil temperature and high oil pressure state of another embodiment of the present invention. It is a graph which shows the characteristic in another embodiment of the present invention. (A) is a plan view of an embodiment in which a hydraulic relief valve and a temperature-sensitive relief valve are incorporated in the oil pump according to the present invention, (B) is a sectional view taken along arrow Y1-Y1 in (A), and (C) is ( (A) Enlarged view of (α) portion, (D) is an enlarged view showing a first variation of (α) portion of (A), (E) is a second variation of (α) portion of (A). (F) is an enlarged view showing a third modification of the (α) part of (A).

  Embodiments of the present invention will be described with reference to the drawings. The present invention has three embodiments, and will be described from the first embodiment. 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 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.

  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.

  Also, for example, when the engine E is started and the accelerator is applied immediately (immediately afterwards) and the engine speed is suddenly increased to a high speed range, high pressure oil flows into the hydraulic relief valve A, and the valve The two first relief outflow portions 34 arranged apart in the axial direction of the housing 3 are opened together, and a relief operation is performed from the two first relief outflow portions 34. Further, immediately after the start of the engine E, the second relief outflow portion 52 of the temperature-sensitive relief valve B is also relieved because of the low oil temperature.

  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, a specific configuration of the hydraulic relief valve A 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. 14).

  In order to make the explanation easy to understand, a vertical direction is set for the pump housing 91. In FIG. 14A, the vertical direction of the pump housing 91 is the vertical direction when the rotating direction of the inner rotor 95 and the outer rotor 96 is a vertical plane. 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 and incorporated in the pump housing 91 [FIG. (See (A), (B)).

  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. 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. 14A).

  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 the inner peripheral side surface 3 b 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 of the first relief outflow portions 34 are provided in parallel along the left-right direction of the valve housing 3 (see FIG. 14A).

  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 pump housing 91 is composed of a housing body 911 and a cover (not shown). Normally, main parts constituting the pump such as the rotor chamber 92, the suction port 93, and the discharge port 94 are provided on the housing main body 911 side, and a cover portion is attached to the housing main body 911 so that the oil pump 9 Is configured. In addition, either the housing body 911 or the cover may be integrally formed with a casing such as an engine.

  Next, a second embodiment of the present invention will be described. As described above, the hydraulic relief valve A includes a valve housing 3 provided with two first relief outflow portions 34. The two first relief outflow portions 34 and 34 are spaced apart in the axial direction of the valve housing 3.

  In the first embodiment, the two first relief outflow portions 34 and 34 have the same opening area (including substantially the same), whereas in the second embodiment, the opening area is the same. The size is different (see FIG. 10). One of them is a first small relief outflow portion 341 and the other is a first large relief outflow portion 342. The opening area of the first small relief outflow portion 341 is small and is referred to as a small opening area Qa. The opening area of the first large relief outflow portion 342 is large and is referred to as a large opening area Qc. Then, when the valve body 1 receives oil pressure from the state in which the valve body 1 is located in the initial position in the valve housing 3 and moves in the axial direction, the pressure of the oil flowing from the first relief inflow portion 33 causes the valve The body 1 opens in the order of the first small relief outflow portion 341 and the first large relief outflow portion 342. The initial position of the valve body 1 is a position when no oil pressure is applied to the valve body 1 and the valve body 1 remains in a predetermined position only by the elastic force of the elastic member 2.

  The opening area of the second relief outflow portion 52 of the temperature-sensitive housing 5 is referred to as a middle opening area Qb. The small opening area Qa of the first small relief outflow portion 341 is smaller than the middle opening area Qb of the second relief outflow portion 52, and the large opening area Qc of the first large relief outflow portion 342 is 2 It is set as the structure larger than the middle opening area Qb of the relief outflow part 52. Thus, the small opening area Qa, the large opening area Qc, and the middle opening area Qb have a size relationship, and the following equation is established.

となる（図１０参照）。 That means

(See FIG. 10).

  By adopting such a configuration, in the relief operation by the hydraulic relief valve A and the temperature-sensitive relief valve B, optimal control can be performed at each of the low oil temperature and high oil temperature, low oil pressure and high oil pressure. is there. First, in the case of the low hydraulic pressure state, in the hydraulic relief valve A, only the first small relief outflow portion 341 is opened by the valve body 1, and the first large relief outflow portion 342 is not opened (see FIG. 11). The small opening area Qa of the first small relief outflow portion 341 is the smallest area compared to the respective opening areas of the other first large relief outflow portion 342 and the second relief outflow portion 52 of the temperature-sensitive relief valve B. .

  For this reason, in the hydraulic relief valve A, only the first small relief outflow portion 341 is open. Therefore, the amount of oil flowing from the upstream flow path 61 to the hydraulic relief valve A side is limited to be small, and the relief amount is Less.

  On the other hand, the middle opening area Qb of the second relief outflow portion 52 of the temperature-sensitive relief valve B arranged in parallel with the hydraulic relief valve A in the upstream flow path 61 is smaller than the small opening area Qa of the first small relief outflow portion 341. Therefore, the relief amount on the temperature-sensitive relief valve B side is larger than the relief amount on the hydraulic relief valve A side, and the temperature-sensitive relief valve B has a greater control amount than the hydraulic relief valve A side. As a result, fuel consumption can be improved.

  Next, when the oil is in a high hydraulic pressure state, in the hydraulic relief valve A, the first small relief outflow portion 341 and the first large relief outflow portion 342 are both opened by further movement of the valve body 1 (see FIG. 12). Therefore, the relief amount by the hydraulic relief valve A is extremely large. On the other hand, the middle opening area Qb of the second relief outflow portion 52 is smaller than the large opening area Qc of the first large relief outflow portion 342. At this time, the first small relief outflow portion 341 is completely open. The relief amount on the valve A side is larger than the relief amount on the temperature-sensitive relief valve B side.

  Accordingly, it is possible to prevent excessive oil relief (because the hydraulic pressure is lower than expected) when the engine is under high load, and to improve the durability and reliability of the engine. In other words, at a low oil pressure and a high oil pressure, the ratio of the relief operation control by the hydraulic relief valve A and the temperature-sensitive relief valve B can be changed to maintain a good relief operation. FIG. 13 is a graph showing characteristics of the second embodiment of the present invention. If the opening area is Qb <Qa (indicated by a two-dot chain line in the graph of FIG. 13), the oil pressure becomes higher than the target oil pressure at low oil temperature, and wasteful oil pressure is generated, resulting in poor fuel consumption. It will end up.

  Next, if the opening area is Qc <Qb (indicated by a thin solid line in the graph of FIG. 13), the hydraulic pressure is lower than the target hydraulic pressure at low oil temperature, and the engine's required hydraulic pressure is not satisfied. Remains a concern for reliability and durability. In the present invention, since the opening area is set to Qa <Qb <Qc, even when the oil temperature is low, it is possible to achieve a low oil pressure transition equivalent to that when the oil temperature is high. Occurrence of hydraulic cracking can be prevented, resulting in low fuel consumption and high reliability and durability. The present invention is indicated by a thick solid line in the graph of FIG.

As a first modified example of the first small relief outflow portion 341, the first small relief outflow portion 341 is divided into two in a direction orthogonal to the axial direction of the valve housing 3. Specifically, the first small relief outflow portion 341 includes: Large holes 341a and small holes 341b having different sizes are formed on the left and right sides (see FIG. 14D). When the first small relief outflow portion 341 is separated into two or more, the total area of the separated number becomes the small opening area Qa.

  Moreover, the 1st small relief outflow part 341 is made into the ellipse shape in the 2nd modification (refer FIG.14 (E)). Furthermore, as a third modified example of the first small relief outflow portion 341, there is a substantially T-shaped one [see FIG. 14 (F)]. Further, the first large relief outflow portion 342 is divided into two parts in a direction orthogonal to the axial direction of the valve housing 3 (see FIG. 14C). In the case where the first large relief outflow portion 342 is separated into two, the total area is the large opening area Qc. Although not particularly illustrated, the first large relief outflow portion 342 may be one.

  In the present embodiment, the first small relief outflow portion 341 is disposed closer to the opening 3a than the first large relief outflow portion 342. However, depending on the shape of the valve body 1, the first large relief outflow portion 342 may be disposed closer to the opening 3a than the first small relief outflow portion 341. Even in such a case, the hydraulic pressure is low. The one that opens is the first small relief outflow portion 341, and the one that opens with high hydraulic pressure becomes the first large relief outflow portion 342. Even the above configuration is included in the technical idea of the present invention.

A ... Hydraulic relief valve, 1 ... Valve, 3 ... Valve housing,
341 ... 1st small relief outflow part, 342 ... 1st large relief outflow part,
B ... temperature-sensitive relief valve, 4 ... temperature-sensitive valve body, 41 ... temperature-sensitive valve part, 41a ... communication path,
42b ... piston, 42 ... temperature sensitive drive unit, 5 ... temperature sensitive housing,
52 ... Second relief outflow part, 6 ... Oil circulation circuit, Qa ... Small opening area,
Qb ... medium opening area, Qc ... large opening area, 61 ... upstream flow path,
62 ... downstream flow path, 9 ... oil pump, 7 ... relief flow path, 71 ... first relief branch flow path, 72 ... second relief branch flow path, 9A ... suction part, 9B ... discharge part, E ... engine.

Claims (6)

  An oil pump, an upstream flow path provided from the discharge part side of the oil pump to the engine, a first relief inflow part, a first small relief outflow part and a first large relief outflow part arranged along the axial direction And a valve body that is moved by the pressure of oil flowing from the first relief inflow portion, and the first small relief outflow portion and the first by the movement of the valve body from the initial state. A hydraulic relief valve that opens and relieves oil in the order of the large relief outflow portion, a temperature sensitive housing having a second relief inflow portion and a second relief outflow portion, and a temperature sensitive valve body, The temperature sensing valve body senses and opens and closes the second relief outflow portion in a stepless manner to relieve oil, and the upstream flow path includes the hydraulic relief valve and the feeling. Warm A leaf valve is arranged in parallel, a small opening area of the first small relief outflow portion is smaller than a middle opening area of the second relief outflow portion, and the large opening area of the first large relief outflow portion is A relief device for an oil circuit of an engine, characterized in that it is configured to be larger than the middle opening area of the second relief outlet.   2. The engine oil circuit relief device according to claim 1, wherein the first large relief outflow portion is divided into two parts in a direction orthogonal to an axial direction of the valve housing. 3. Relief device for oil circuit.   The oil circuit relief device for an engine according to claim 1 or 2, wherein the first small relief outflow portion is divided into two parts in a direction perpendicular to the axial direction of the valve housing. Relief device for engine oil circuit.   4. The engine oil circuit relief device according to claim 1, wherein when the oil temperature is low, the temperature-sensitive relief valve is subjected to oil relief. Oil circuit relief device.   The relief circuit for an oil circuit of an engine according to any one of claims 1 to 3, 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 a high oil temperature. A relief device for an oil circuit of an engine, characterized in that the amount of oil relief is reduced in the vicinity.   4. The oil circuit relief device for an engine according to claim 1, wherein when the oil temperature is high, the temperature-sensitive relief valve does not perform oil relief. 5. Relief device for oil circuit.

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