JP6499123B2 - Relief valve device - Google Patents

Description

  The present invention relates to a relief valve device capable of setting an appropriate discharge pressure in a low engine speed range, a medium engine speed range, and a high engine speed range in an oil pump such as a vehicle engine.

  Conventionally, various relief valve devices provided in an oil circulation circuit for supplying oil to an engine supply hydraulic oil suitable for engine speeds in a low speed range, a medium speed range, and a high speed range, respectively. Existing. There exists patent document 1 (Unexamined-Japanese-Patent No. 2010-238205) as this kind of thing.

  The contents of Patent Document 1 will be outlined. In the description, the reference numerals used in Patent Document 1 are used in parentheses as they are. An orifice-like return passage (26E) is formed in the valve body (27), which is a relief valve, downstream of the back pressure chamber (35) as a hydraulic control chamber. In a state of relief (exhaust pressure) with low hydraulic pressure (see FIG. 4 of Patent Document 1), the oil flows from the back pressure chamber (35) through the return passage (26E) formed in the sleeve (26). It is configured to return to the suction side.

  In the state of relief (exhaust pressure) with high hydraulic pressure (see FIG. 5 of Patent Document 1), the oil cannot move from the back pressure chamber (35) to the return passage (26E) formed in the sleeve (26), The oil in the back pressure chamber (35) does not return to the suction side of the pump.

JP 2010-238205 A

  By the way, as a function of the return passage (26E), the valve element 27 is rotated in the circumferential direction, and bubbles and foreign matters carried to the back pressure chamber (35) are back-strained together with oil continuously flowing through the back pressure chamber (35). It is discharged from the pressure chamber (35) to the suction side of the pump. The pressure increase in the back pressure chamber (35) required for switching the valve opening pressure is started prior to the opening of the return passage (26E). The return passage (26E) has an opening area in the outlet passage (25) that is smaller than an opening area of the lead-in / out hole (36) in the back pressure chamber (35).

  The opening portion of the return passage (26E) acts as a large flow resistance against the outlet passage (25), the amount of oil flowing out from the back pressure chamber (35) is limited, and the oil pressure in the back pressure chamber (35) is reduced. It will be generally maintained. The switching valve (40) is, for example, a three-way solenoid valve, and when the switching valve (40) is energized, a passage communicating with the back pressure chamber (35) through the lead-in / in passage (41) is an introduction passage. (42) is selected, and the hydraulic pressure in the back pressure chamber (35) is increased. Further, when the energization to the switching valve (40) is interrupted, the passage communicating with the back pressure chamber (35) through the lead-in / out passage (41) is selected as the discharge passage (43), and the hydraulic pressure in the back pressure chamber (35) is selected. Will step down.

  In the state of relief with low hydraulic pressure (see FIG. 4 of Patent Document 1), the return passage (26E) is always leaking, and in the state of relief with high hydraulic pressure (see FIG. 5 of Patent Document 1), the return passage ( 26E) is always closed, and even in this prior art, the relief pressure can only be changed to two, and it is difficult to achieve an intermediate hydraulic relief between the low hydraulic relief and the high hydraulic relief. . This is illustrated by the graph showing the characteristics of the prior art in FIG. Accordingly, an object of the present invention is to make it possible to create an intermediate hydraulic pressure relief between a low hydraulic pressure relief and a high hydraulic pressure relief in an oil pump such as a vehicle engine.

  Therefore, as a result of diligent and research to solve the above-mentioned problems, the inventor moved the invention according to claim 1 to a housing having a valve chamber, an orifice, and a relief outlet, and the valve chamber of the housing. And a relief valve provided with a valve body that opens and closes the relief discharge port portion, an elastic member that elastically biases the valve body in a direction to close the relief discharge port portion, and controls the supply of oil to the valve chamber An oil control valve that allows oil to flow constantly through the inlet and the orifice from the oil control valve. The valve chamber has a first valve passage portion and a second valve having the orifice. The valve body has a first valve portion and a second valve portion along an axial direction, the oil control valve supplies oil to the second valve passage portion, and 1 valve The first valve portion is disposed in the portion, the second valve portion is disposed in the second valve passage portion, and the amount of oil is stepped through the oil control valve in the second valve passage portion. The above-mentioned problems have been solved by providing a relief valve device that is configured to supply oil while being increased or decreased and to discharge the supplied oil from the orifice.

  According to a second aspect of the present invention, there is provided a housing having a valve chamber, an orifice, and a relief discharge port portion, a valve body that opens and closes the relief discharge port portion while moving in the valve chamber of the housing, and the valve body includes the relief discharge port. A relief valve provided with an elastic member that elastically biases the outlet in a closing direction, and an oil control valve that controls the supply of oil to the valve chamber, and an inlet from the oil control valve in the valve chamber; Oil is always allowed to flow through the orifice, the valve chamber has a first valve passage portion having the orifice and a second valve passage portion, and the valve body includes a first valve portion along the axial direction. A second valve portion, wherein the oil control valve supplies oil to the first valve passage portion, the first valve portion is disposed in the first valve passage portion, and the second valve passage portion is provided with the second valve passage portion. Is the second valve part The relief valve device is configured to supply the first valve passage portion while increasing or decreasing the amount of oil steplessly through the oil control valve and to discharge the supplied oil from the orifice. The above problem has been solved.

  According to a third aspect of the present invention, there is provided a housing having a valve chamber, an orifice, and a relief discharge port portion, a valve body that opens and closes the relief discharge port portion while moving in the valve chamber of the housing, and the valve body includes the relief discharge port. A relief valve provided with an elastic member that elastically biases the outlet in a closing direction, and an oil control valve that controls the supply of oil to the valve chamber, and an inlet from the oil control valve in the valve chamber; The orifice is always capable of circulating oil, has an oil inlet that applies pressure to the valve body on the front end side of the valve chamber, and an inlet on the oil control valve side on the rear end side of the valve chamber; The oil control valve is located on the rear end side of the valve chamber and on the upstream side of the valve chamber, and supplies the oil amount in a stepless manner. Together by the supplied oil was a relief valve device comprising a structure for discharging from said orifice, the above-mentioned problems are eliminated.

  According to a fourth aspect of the present invention, in the relief valve device according to any one of the first, second, and third aspects, the oil control valve is a relief valve device using a solenoid valve. Solved. The relief valve device according to any one of claims 1, 2, and 3, wherein the minimum flow passage area to the valve chamber when the oil control valve is fully opened is the orifice. The above-described problems have been solved by providing a relief valve device that is larger than the minimum flow path cross-sectional area.

  According to a sixth aspect of the present invention, there is provided a housing having a valve chamber, an orifice, and a relief discharge port portion, a valve body that opens and closes the relief discharge port portion while moving in the valve chamber of the housing, and the valve body includes the relief discharge port. A relief valve provided with an elastic member that elastically biases the outlet in a closing direction, and an oil control valve that controls the supply of oil to the valve chamber, and an inlet from the oil control valve in the valve chamber; The above problem has been solved by providing a relief valve device in which oil can always flow through the orifice and the oil control valve is fully closed in the vicinity of the low engine speed range and the idling engine speed range. According to a seventh aspect of the present invention, there is provided a housing having a valve chamber, an orifice, and a relief discharge port portion, a valve body that opens and closes the relief discharge port portion while moving in the valve chamber of the housing, and the valve body includes the relief discharge port. A relief valve provided with an elastic member that elastically biases the outlet in a closing direction, and an oil control valve that controls the supply of oil to the valve chamber, and an inlet from the oil control valve in the valve chamber; The relief valve device is configured such that oil can flow continuously with the orifice, and the oil control valve has a stepless increase in the amount of oil supplied to the valve chamber when the engine speed increases within a medium engine speed range. As a result, the above problems were solved.

  According to an eighth aspect of the present invention, there is provided a housing having a valve chamber, an orifice, and a relief discharge port portion, a valve body that opens and closes the relief discharge port portion while moving in the valve chamber of the housing, and the valve body includes the relief discharge port. A relief valve provided with an elastic member that elastically biases the outlet in a closing direction, and an oil control valve that controls the supply of oil to the valve chamber, and an inlet from the oil control valve in the valve chamber; The oil can be circulated at all times with the orifice, and when the rotational speed increases within the high rotational speed range of the engine, the oil control valve is a relief valve device in which the amount of oil supplied to the valve chamber is continuously reduced. As a result, the above problems were solved.

  According to the first aspect of the present invention, there is provided a valve body that opens and closes the relief discharge port portion while moving in the valve chamber of the housing, and a relief that includes an elastic member that elastically biases the valve body in a direction to close the relief discharge port portion A valve and an oil control valve that controls the supply of oil to the valve chamber, and in the valve chamber, the inlet and the orifice from the oil control valve are configured so that oil can always flow. is there. As a result, it is possible to obtain an appropriate discharge pressure in the low speed / medium speed range and the high speed range of the engine.

  Further, in the first aspect of the invention, the first valve portion is disposed in the first valve passage portion, the second valve portion is disposed in the second valve passage portion, and the second valve passage portion includes the second valve portion. The oil amount is supplied in a stepless manner through an oil control valve, and the supplied oil is discharged from the orifice. Thus, since the relief valve is provided with an oil control valve that supplies oil by changing the oil amount steplessly, it can be supplied while adjusting the oil inflow amount in the second valve passage. As a result, it is possible to supply oil to the second valve passage section from the oil control valve in a stepless manner in the amount of oil in the middle speed range including the case where the relief is necessary and the case where it is not necessary. it can.

  And in the 2nd valve passage part, it becomes possible to always set the amount of oil supply appropriately according to the change of the number of rotations in the middle number of rotations range of the engine or the engine load. By the supply of oil according to the change in the rotation speed or the engine load etc. into the second valve passage portion, the operation by the oil of the second valve portion in the second valve passage portion is caused in the first valve passage portion during the relief operation. Corresponding to the pressure change of the inflowing oil, the operation of the valve body is assisted, and the relief operation with the target hydraulic pressure in the middle rotation speed range can be realized.

  More specifically, the orifice discharges oil little by little. Therefore, the more oil supplied from the oil control valve to the valve chamber, the higher the hydraulic pressure of the second valve passage portion, and the less oil supplied from the oil control valve, the second valve passage. The hydraulic pressure of the part becomes low. Thus, the oil pressure supplied from the oil control valve to the valve chamber is made appropriate by the orifice, and the above operation is realized.

  In the invention of claim 2, the valve chamber has a first valve passage portion having the orifice and a second valve passage portion, and the position of the orifice is different from that of the invention of claim 1, The valve body can perform substantially the same operation as that of the first aspect of the invention and can perform a good relief operation. According to a third aspect of the present invention, the oil control valve is located on the rear end side of the valve chamber and on the upstream side of the valve chamber, and supplies the oil supplied from the orifice while increasing and decreasing the amount of oil steplessly. It is the structure which discharges. With such a configuration, even if the oil control valve breaks down, the relief pressure does not decrease and the reliability of the engine is protected.

  In the invention of claim 4, the oil control valve has the advantage that the use of a solenoid valve reduces the number of components and the installation space. According to a fifth aspect of the present invention, the minimum channel cross-sectional area to the valve chamber when the oil control valve is fully opened is larger than the minimum channel cross-sectional area of the orifice.

  Since the cross-sectional area of the flow path is smaller for the orifice, the control of the hydraulic pressure in the valve chamber when the oil control valve is fully opened is determined only by the cross-sectional area of the orifice. It will be good. According to the sixth aspect of the present invention, the oil control valve is fully closed in the vicinity of the low engine speed range and the idling engine speed range, so that useless relief operation can be prevented from occurring in the low engine speed range.

  According to the seventh aspect of the present invention, the oil control valve is configured such that the oil supply amount to the valve chamber continuously increases steplessly when the engine speed increases within the medium engine speed range. The oil pressure can be kept substantially constant with almost no change in the oil pressure within the range of the engine speed. In the invention of claim 8, the oil supply amount to the valve chamber decreases steplessly within the high engine speed range, so that the oil pressure can be increased steplessly within the engine high engine speed range. .

(A) is a schematic diagram in which the relief valve device according to the present invention is incorporated in an oil circulation circuit, (B) is a schematic diagram of a relief valve housing and an oil control valve, and (C) is a schematic vertical side view of the valve body. FIG. (A) is a schematic view showing the flow of oil in the relief valve device in the low rotation speed range in the present invention, (B) is an enlarged vertical side view showing the first valve passage portion, the second valve passage portion and the oil control valve. FIG. (A) is a schematic diagram showing the flow of oil in the relief valve device in the middle rotation speed range in the present invention, (B) is a vertical side view schematically showing the first valve passage portion, the second valve passage portion and the oil control valve. FIG. (A) is a schematic diagram showing the flow of oil in the relief valve device in the high rotation speed range according to the present invention, and (B) is a schematic vertical side view showing the first valve passage portion, the second valve passage portion and the oil control valve. FIG. (A) Schematic sectional drawing of the relief valve apparatus provided with the valve body of another embodiment in this invention, (B) is a vertical front view of another embodiment of a valve body. It is a graph (1) which shows the characteristic of this invention. It is a graph (2) which shows the characteristic of this invention. It is a graph which shows the characteristic of a prior art. (A) is the schematic which the relief valve apparatus of 2nd Embodiment in this invention was integrated in the oil circulation circuit, (B) is the schematic of the housing in 2nd Embodiment. (A) is the schematic which the relief valve apparatus of 3rd Embodiment in this invention was integrated in the oil circulation circuit, (B) is the schematic of the housing in 3rd Embodiment. (A) is the schematic which the relief valve apparatus of 4th Embodiment in this invention was integrated in the oil circulation circuit, (B) is the schematic of the housing in 4th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The configuration of the present invention includes a plurality of embodiments, and mainly includes a relief valve A and an oil control valve 6. The relief valve A is incorporated in the oil circulation circuit 7. The oil circulation circuit 7 includes an oil pump 81 and an engine 82 (see FIG. 1A). The first embodiment of the present invention will be described below.

The relief valve A includes a housing 1, a valve body 4, an elastic member 5 and the like [FIG.
See A)]. A valve chamber 2 is formed in the housing 1 (see FIG. 1B). The valve chamber 2 is a chamber serving as a passage for the valve body 4 to move. Further, the housing 1 has a front end and a rear end for convenience of explanation. The housing 1 includes a valve chamber 2 to be described later, and the front end and the rear end of the valve chamber 2 are the same as the front end and the rear end of the housing 1. Further, the front end and the rear end of the housing 1 (valve chamber 2) are not changed when the direction is changed.

  Specifically, in FIG. 1 to FIG. 5 and FIG. 9 to FIG. 11, the front end and the rear end are the upper side of the housing 1 and the lower side is the rear end. The valve chamber 2 has a first valve passage portion 21 and a second valve passage portion 22. Or let the direction where the elastic member 5 is arrange | positioned be a rear end. Further, the first valve passage portion 21 is formed to have an inner diameter smaller than that of the second valve passage portion 22.

  A first inlet 23 is formed in the first valve passage portion 21. The first inflow port 23 is communicated by a first branch flow path 71 that is branched from the oil circulation circuit 7 on the discharge side of the oil pump 81 in the oil circulation circuit 7, that is, on the downstream side of the oil pump 81. [See FIG. 1 (A)]. A part of the oil discharged from the oil pump 81 flows into the first valve passage portion 21 from the first inflow port 23 through the first branch passage 71.

  A second inlet 24 and an orifice 25 are formed in the second valve passage portion 22. The second inlet 24 communicates with the oil circulation circuit 7 via the second branch flow path 72. The second branch flow path 72 is branched from the oil circulation circuit 7 on the discharge side of the oil pump 81 in the oil circulation circuit 7, that is, on the downstream side of the oil pump 81 (see FIG. 1A). ]. The orifice 25 is a part that serves to discharge the oil in the second valve passage portion 22 to the outside of the housing 1 little by little. Specifically, the orifice 25 is a tubular member having a very small inner diameter or a discharge port shape. The orifice 25 communicates with an oil pan or the like (not shown).

  As shown in FIG. 1C, the valve body 4 includes a valve portion such as a first valve portion 41, a second valve portion 42, and a third valve portion 43 and a connecting shaft portion 44 that connects the valve portions to each other. The The first valve portion 41 and the second valve portion 42 are continuously formed in the axial direction, and the diameter of the first valve portion 41 is smaller than the diameter of the second valve portion 42. The second valve portion 42 and the third valve portion 43 are connected to each other by a connecting shaft portion 44 in a state of being separated at a predetermined interval.

  The first valve portion 41 slides in the first valve passage portion 21 of the housing 1, and the second valve portion 42 slides in the second valve passage portion 22 of the housing 1 [FIG. )reference〕. The third valve portion 43 is formed therein with a hollow cylindrical recess having an opening at the shaft end portion, and this portion serves as an elastic member receiving portion 45 so that a part of the elastic member 5 can be inserted. [See FIGS. 1A and 1C].

  The valve body 4 is accommodated in the housing 1 together with the elastic member 5 as shown in FIG. The valve body 4 accommodated in the housing 1 is constantly elastically biased by the elastic member 5 toward the first valve passage portion 21 side of the valve chamber 2. The elastic member 5 is specifically a coil spring. Moreover, as another embodiment of the valve body 4, the shape along the axial direction of the connection shaft part 44 which connects the opposing surfaces of the second valve part 42 and the third valve part 43 is a polygonal line shape. There is one having a minimum diameter at the center in the axial direction and a conical shape in which the diameter gradually increases toward the other side (see FIG. 5A).

  Moreover, as another embodiment of the valve body 4, the shape along the axial direction of the connection shaft part 44 which connects the opposing surfaces of the second valve part 42 and the third valve part 43 is recessed, and the arc shape or substantially C There is a character shape. Specifically, the center in the axial direction of the connecting shaft portion 44 has a minimum diameter, and the diameter gradually increases toward the shaft end (see FIG. 5B).

  The oil control valve 6 is provided in a second branch flow path 72 that communicates the second valve passage portion 22 and the oil circulation circuit 7 in the valve chamber 2 [see FIG. 1 (A)]. The oil control valve 6 communicates with the second inlet 24 with respect to the second valve passage 22, and the oil that has passed through the oil control valve 6 flows into the second valve passage 22 from the second inlet 24. The oil amount control by the oil control valve 6 is performed on the second branch flow path 72. The oil control valve 6 supplies oil to a predetermined location while changing the oil amount steplessly. Although there are various structures of the oil control valve 6, a throttle valve is generally provided therein, and the oil flow rate is changed by adjusting the throttle valve.

  As a control means for the throttle valve of the oil control valve 6, a solenoid valve is most suitable. Specifically, a linear solenoid valve is used, whereby the oil control valve 6 can smoothly and continuously increase and decrease the amount of oil to be controlled, and can increase and decrease the amount of oil according to the target value. In addition, a variable displacement type oil pump may be used as means for smoothly increasing and decreasing the hydraulic pressure steplessly.

  In the first embodiment of the present invention, in a state where the first valve portion 41 located at the distal end portion of the valve body 4 reaches the first valve passage portion 21 at the distal end portion of the valve chamber 2, the second valve portion 42. Is not in contact with the tip portion of the second valve passage portion 22, and a gap is formed between them. Due to the gap, the orifice 25 and the second inlet 24 are always in communication in the second valve passage portion 22, and the oil that has passed through the oil control valve 6 passes through the valve chamber from the second inlet 24. 2 can pass through the second valve passage portion 22 and flow to the orifice 25 (see FIGS. 1A and 2). That is, the oil that flows into the valve chamber 2 from the oil control valve 6 always flows out from the orifice 25. Such a configuration is the same not only in the first embodiment but also in other embodiments.

  Next, a specific embodiment of a configuration in which the relief valve A is incorporated in the oil circulation circuit 7 will be described. In the housing 1 of the relief valve A, a part constituting the flow path of the oil circulation circuit 7 is formed. This portion is referred to as a main flow path 3 of the housing 1 (see FIG. 1A). The main flow path 3 exists at a position where the first valve passage portion 21 and the second valve passage portion 22 do not intersect.

  An inflow hole 31 and an outflow hole 32 of the main flow path 3 are formed in the inner peripheral wall of the valve chamber 2. The relief discharge port portion 26 of the housing 1 exists at a position opposite to the first valve passage portion 21 and the second valve passage portion 22 with respect to the main flow path 3 (see FIG. 1A). The relief discharge port portion 26 is configured to communicate with a portion upstream of the oil pump 81 and closer to the suction side in the oil circulation circuit 7 via a relief branch passage 73 (see FIG. 1A). . The connecting shaft portion 44 of the valve body 4 is always positioned in the inflow hole 31 and the outflow hole 32 of the main flow path 3 (see FIG. 1A).

  The diameter of the connecting shaft portion 44 is smaller than the inner diameter of the valve chamber 2 at three locations of the main flow path. Therefore, the inflow hole 31 and the outflow hole 32 are not closed and are always opened. It becomes a state. As a result, the oil circulation circuit 7 constantly circulates oil by the oil pump 81 (see FIGS. 2 to 4).

  The third valve portion 43 of the valve body 4 serves to open and close the relief discharge port portion 26. When the valve body 4 reciprocates in the valve chamber 2 in the axial direction, the relief discharge port portion 26 is opened and closed. Then, a part of the oil flowing through the main flow path 3 of the oil circulation circuit 7 flows into the relief discharge port portion 26 and performs a relief operation.

  Next, the relief operation of the engine 82 in the low speed range, medium speed range, and high speed range of the relief valve device according to the present invention will be described. First, in the vicinity of the low speed range of the engine 82 or the idling speed range, as shown in FIG. 2, all the oil hydraulic pressure generated by the oil pump 81 is sent to the engine. Therefore, the oil control valve 6 is controlled to be fully closed in the low engine speed range.

  Therefore, oil is not supplied to the second valve passage portion 22 by the oil control valve 6. In the low speed range of the engine 82, the pressure is received only by the front end surface of the first valve portion 41 in the first valve passage portion 21 through the first branch flow passage 71, and the second in the second valve passage portion 22. No hydraulic pressure is applied to the valve portion 42.

  Next, in the middle speed region of the engine 82, as shown in FIG. 3, the oil control valve 6 operates to supply oil into the second valve passage portion 22. In the middle rotation speed range, the hydraulic pressure hardly changes from the start portion (the portion closer to the low rotation speed region) to the end portion (the portion closer to the high rotation speed region). As described above, as the engine speed increases in the middle speed range, the oil control valve 6 gradually increases the opening area of the throttle valve.

  As a result, the oil control valve 6 controls the amount of oil flowing through the second branch flow path 72 to increase. Since the rotational speed of the oil pump 81 increases as the rotational speed of the engine 82 increases, the hydraulic pressure itself discharged from the oil pump 81 increases and enters the first valve passage portion 21 from the first branch passage 71. Oil is supplied and the first valve portion 41 is pressured.

  At the same time, the oil control valve 6 supplies oil from the second branch flow path 72 to the second valve passage portion 22 to assist the movement operation of the valve body 4. With the assistance of the movement operation of the valve body 4 by the oil control valve 6, the valve body 4 opens the relief discharge port portion 26 and relief is performed.

  In this way, the oil control valve 6 operates in the middle rotational speed range, and the relief hydraulic pressure is reduced by supplying an appropriate amount of oil to the second valve passage portion 22 in accordance with the respective rotational speeds in a stepless manner. It can be kept almost constant with almost no change. Therefore, it is possible to eliminate unnecessary work in the middle rotation speed range.

  Further, when approaching the high speed range side in the middle speed range, the oil control valve 6 gradually reduces the opening area, lowers the hydraulic pressure on the second valve passage portion 22 side, and gradually increases the first valve passage portion. The pressure is received only by the first valve portion 41 on the 21 side, and the oil pressure can be smoothly transferred from the middle rotation speed range to the high rotation speed range.

  Next, the oil control valve 6 is substantially fully closed, the oil supply to the second valve passage portion 22 side is stopped, the hydraulic pressure is supplied only to the first valve passage portion 21 side, and the pressure received by only the first valve portion 41 is received. It becomes. Since the hydraulic pressure is large in the high rotation speed range, the valve body 4 moves as it is, and the relief discharge port portion 26 is opened to perform relief.

  Thus, in the relief valve device according to the present invention, the first valve portion 41 is disposed in the first valve passage portion 21, the second valve portion 42 is disposed in the second valve passage portion 22, and The two-valve passage portion 22 is supplied through the oil control valve 6 while increasing and decreasing the amount of oil in a stepless manner, and the supplied oil is discharged from the orifice 25.

  Since the relief valve A is provided with the oil control valve 6 that supplies the oil amount in a stepless manner, the oil inflow amount in the second valve passage portion 22 can be supplied in a stepless manner. As a result, the oil amount is continuously changed from the oil control valve 6 to the second valve passage portion 22 in the middle speed range including the case where the relief is necessary and the case where the engine 82 is not needed. Can be supplied.

  And in the 2nd valve channel | path part 22, it becomes possible to always set the supply amount of oil appropriately according to the change of the rotation speed in the middle rotation speed area of the engine 82 or the engine load. By the oil supply according to the change in the rotational speed or the engine load or the like into the second valve passage portion 22, the operation of the second valve portion 42 in the second valve passage portion 22 by the oil is performed during the relief operation. Corresponding to the pressure change of the oil flowing into the one-valve passage portion 21, the operation of the valve body 4 is assisted, and the relief operation with the target hydraulic pressure in the middle rotation speed range can be realized (FIGS. 6 and 7). reference).

  Next, a second embodiment of the present invention will be described. As shown in FIG. 9, the configuration of the second embodiment is substantially the same as the configuration of the first embodiment. The configuration of the valve chamber 2 includes a first valve passage portion 21 and a second valve passage portion 22. The valve body 4 has a first valve portion 41 and a second valve portion 42. A first inlet 23 and an orifice 25 that are oil inlets through the oil control valve 6 are provided in the first valve passage 21.

  In the second embodiment, in a state where the second valve portion 42 of the valve body 4 has reached the distal end portion of the second valve passage portion 22, the distal end of the first valve portion 41 is the distal end of the first valve passage portion 21. A gap is formed between the two parts without contacting the part. Due to the gap, the orifice 25 and the first inlet 23 are always in communication in the first valve passage portion 21, and the relief oil from the oil control valve 6 is supplied from the first inlet 23 to the valve chamber. 2 can pass through the first valve passage portion 21 and flow to the orifice 25.

  In the second embodiment, as in the first embodiment, the relief oil flowing from the first inlet 23 and the second inlet 24 into the first valve passage 21 and the second valve passage 22 in the valve chamber 2 is A force by pressure is applied in a direction in which the valve body 4 is moved toward the rear end side in the valve chamber 2. That is, the relief operation in the second embodiment is the same as that in the first embodiment.

  Next, a third embodiment of the present invention will be described. The configuration of the third embodiment is as shown in FIG. 10, and the configuration of the valve chamber 2 in the housing 1 is a cylindrical shape in which the first valve passage portion 21 and the second valve passage portion 22 are substantially integrated with the same inner diameter. It is configured as. This unified passage is referred to as a general passage portion 212. That is, the valve chamber 2 is configured by the general passage portion 212. An oil inlet is provided at the tip of the valve chamber 2, that is, the general passage portion 212.

  The leading inlet is referred to as a general first inlet 27. The general first inlet 27 communicates with a first branch flow path 71 that branches from the oil circulation circuit 7. That is, the general first inlet 27 is not in communication with the oil control valve 6. In addition, an overall second inlet 28 and an orifice 25 are provided as inlets from the oil control valve 6 at the rear end portion of the overall passage portion 212 of the valve chamber 2.

  Moreover, the valve body 4 is the structure by which the 1st valve part 41 and the 2nd valve part 42 were integrated as one disc. Thus, the disc-shaped valve portion in which the first valve portion 41 and the second valve portion 42 are integrated is referred to as a tip valve portion 412. In the third embodiment, the valve body 4 including the tip valve portion 412, the connecting shaft portion 44, and the third valve portion 43 moves in the general passage portion 212. The 3rd valve part 43 is the structure equivalent to 1st Embodiment, and the elastic member 5 is inserted and accommodated. The tip valve portion 412 and the third valve portion 43 have the same diameter.

  The total second inlet 28 and the orifice 25 from the oil control valve 6 are provided on the rear end side of the valve chamber 2. That is, in the valve chamber 2, the total second inlet 28 from the oil control valve 6 and the orifice 25 are positioned on the side where the third valve portion 43 of the valve body 4 is disposed. In the third embodiment, the larger the flow rate and flow velocity by the oil control valve 6, the greater the oil pressure upstream of the orifice 25 formation position in the general passage portion 212. For this reason, even if force due to the oil pressure on the general first inlet 27 side is applied to the valve body 4, the movement of the valve body 4 is suppressed and controlled by the resistance due to the oil pressure on the general second inlet 28 side. The

  This control is performed by oil flow control by the oil control valve 6. The rear end of the third valve portion 43 and the rear end of the general passage portion 212 do not come into contact with each other, and a gap is generated between them. The orifice 25 and the integrated second inlet 28 are always in communication with each other by the gap, and the oil that has passed through the oil control valve 6 passes through the integrated passage portion 212 from the integrated second inlet 28 to the orifice. 25 is configured to be able to flow to 25.

  Next, a fourth embodiment of the present invention will be described. As shown in FIG. 11, the configuration of the fourth embodiment is that the valve chamber 2 is composed of a general passage portion 212 in the third embodiment described above, and the relief discharge port portion 26, the inflow hole 31, and the outflow hole 32. Are provided with only the second integrated inlet 28 communicating with the oil control valve 6. The valve body 4 is composed of a tip valve portion 412, a connecting shaft portion 44, and a third valve portion 43. This embodiment has the same effect in the present invention with the simplest configuration.

A ... relief valve, 1 ... housing, 21 ... first valve passage, 22 ... second valve passage,
25 ... Orifice, 26 ... Relief discharge port part, 4 ... Valve body, 41 ... First valve part 41,
42 ... 2nd valve part, 6 ... Oil control valve.

Claims (8)

A housing having a valve chamber, an orifice, and a relief discharge port; a valve body that opens and closes the relief discharge port while moving in the valve chamber of the housing; and the valve body is elastic in a direction to close the relief discharge port. A relief valve having an elastic member for energizing, and an oil control valve for controlling the supply of oil to the valve chamber. The valve chamber has a first valve passage portion and a second valve passage portion having the orifice, and the valve body includes a first valve portion and a second valve portion along an axial direction. have the oil control valve supplies the oil to the second valve passage, said the first valve passage is disposed the first valve part, wherein the second valve passage and the second valve portion Is arranged Relief valve arrangement a valve passage, characterized by comprising a structure for discharging the supplied oil is supplied while increasing or decreasing steplessly the amount of oil through the oil control valve from the orifice. A housing having a valve chamber, an orifice, and a relief discharge port; a valve body that opens and closes the relief discharge port while moving in the valve chamber of the housing; and the valve body is elastic in a direction to close the relief discharge port. A relief valve having an elastic member for energizing, and an oil control valve for controlling the supply of oil to the valve chamber. In the valve chamber, oil is always supplied to the inlet and the orifice from the oil control valve. The valve chamber has a first valve passage portion having the orifice and a second valve passage portion, and the valve body includes a first valve portion and a second valve portion along the axial direction. have the oil control valve supplies oil to the first valve passage, said the first valve passage is disposed the first valve part, wherein the second valve passage and the second valve portion Is arranged, the first Relief valve device in a passage characterized by comprising a structure for discharging the supplied oil is supplied while increasing or decreasing steplessly the amount of oil through the oil control valve from the orifice. A housing having a valve chamber, an orifice, and a relief discharge port; a valve body that opens and closes the relief discharge port while moving in the valve chamber of the housing; and the valve body is elastic in a direction to close the relief discharge port. A relief valve having an elastic member for energizing, and an oil control valve for controlling the supply of oil to the valve chamber. In the valve chamber, oil is always supplied to the inlet and the orifice from the oil control valve. An oil inlet that applies pressure to the valve body on the front end side of the valve chamber is provided, and the oil control valve side inlet and the orifice are provided on the rear end side of the valve chamber, The oil control valve is located on the rear end side of the valve chamber and on the upstream side of the valve chamber. Relief valve device characterized by comprising as structure for discharging from the orifice. The relief valve device according to any one of claims 1, 2, and 3, wherein the oil control valve uses a solenoid valve. 4. The relief valve device according to claim 1, wherein a minimum flow path cross-sectional area to the valve chamber when the oil control valve is fully opened is a minimum flow path cross-sectional area of the orifice. Relief valve device characterized by being larger than the above. A housing having a valve chamber, an orifice, and a relief discharge port; a valve body that opens and closes the relief discharge port while moving in the valve chamber of the housing; and the valve body is elastic in a direction to close the relief discharge port. A relief valve having an elastic member for energizing, and an oil control valve for controlling the supply of oil to the valve chamber. In the valve chamber, oil is always supplied to the inlet and the orifice from the oil control valve. and it can flow, the relief valve device in the vicinity low speed region and the idle speed range of the engine, wherein the oil control valve is fully closed. A housing having a valve chamber, an orifice, and a relief discharge port; a valve body that opens and closes the relief discharge port while moving in the valve chamber of the housing; and the valve body is elastic in a direction to close the relief discharge port. A relief valve having an elastic member for energizing, and an oil control valve for controlling the supply of oil to the valve chamber. In the valve chamber, oil is always supplied to the inlet and the orifice from the oil control valve. The relief valve device according to claim 1, wherein the oil control valve is continuously increased in the amount of oil supplied to the valve chamber when the engine speed is increased and the engine speed increases within a medium engine speed range. A housing having a valve chamber, an orifice, and a relief discharge port; a valve body that opens and closes the relief discharge port while moving in the valve chamber of the housing; and the valve body is elastic in a direction to close the relief discharge port. A relief valve having an elastic member for energizing, and an oil control valve for controlling the supply of oil to the valve chamber. The relief valve device according to claim 1, wherein the oil control valve is configured to continuously reduce the amount of oil supplied to the valve chamber when the engine speed increases within a high engine speed range.

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