JP3670024B2 - Hydraulic control device for transmission - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a hydraulic control device for a transmission.
[0002]
[Prior art]
A conventional hydraulic control device for a transmission is disclosed in Japanese Patent Application Laid-Open No. 57-40147. The transmission hydraulic control apparatus shown therein includes an oil pump, a pressure regulator valve, and an oil strainer. The oil pump sucks oil from the opening of the oil strainer into the suction port. The oil strainer has an opening on the lower surface, and the oil passage that communicates with the suction port of the oil pump communicates with the upper side of the valve body, so oil is drawn upward through the opening of the oil strainer. It will be done. The valve body is provided with a pressure regulator valve. The pressure regulator valve adjusts the hydraulic pressure discharged from the oil pump. For this purpose, part of the oil in the discharge circuit from the oil pump is discharged from the drain port. The drain port has an opening in the lower surface of the valve body, and discharges oil downward. The drain port of the pressure regulator valve is disposed inside the oil strainer. That is, the drain port of the pressure regulator valve is disposed between the opening of the oil strainer and the suction port of the oil pump in the oil flow direction.
[0003]
[Problems to be solved by the invention]
However, in the conventional transmission hydraulic control device as described above, the oil discharged from the drain port of the pressure regulator valve obstructs the flow of oil to the intake port of the oil pump, thereby reducing the suction efficiency of the oil pump. There is a problem of doing. That is, as described above, the oil is sucked upward from the opening of the oil strainer, once flows laterally along the bottom surface of the valve body, and then flows upward toward the suction port of the oil pump. In contrast, oil is discharged downward from the drain port of the pressure regulator valve. For this reason, the oil discharged from the drain port with respect to the flow of oil sucked from the opening of the oil strainer is discharged in a substantially opposite direction, and a flow collision occurs. For this reason, the resistance of the oil to be sucked increases, the flow is disturbed, and the suction efficiency of the oil pump is lowered. The present invention aims to solve such a problem.
[0004]
[Means for Solving the Problems]
This invention solves the said subject by providing the rectification | straightening member which rectifies | straightens the flow of the oil discharged | emitted from the drain port of a pressure regulator valve. In other words, the present invention has an oil pump (20), an oil strainer (34), and a pressure regulator valve (11) housed in the valve body (10), and the oil pump (20) sucks this. Oil is drawn into the port (20a) from the opening (34a) of the oil strainer (34) and discharged to the discharge port (20b). The pressure regulator valve (11) is connected to the oil pump discharge circuit (22). A part of the oil is discharged from the surface of the valve body (10) through a drain port (26) provided in the valve body (10), thereby adjusting the discharge pressure of the oil pump (20). The valve body (10) by surface is configured as part of the suction passage of the oil pump, Oy along the valve body surface Opening of the strainer (34) (34a) oil flows I toward the suction port of the oil pump (20) (20a) from the oil from the valve body (10) surface is configured to be discharged into the flow The direction of the oil flow discharged from the surface of the valve body (10) through the drain port (26) of the pressure regulator valve (11) is determined based on an oil strainer (34). ) Is provided on the surface of the valve body so as to change the direction of the oil flowing from the opening (34a) to the suction port (20a) of the oil pump (20). It is characterized by that.
[0005]
[Action]
The sucked oil flows from the opening of the oil strainer and flows toward the suction port of the oil pump. Oil is discharged from the drain port of the pressure regulator valve for pressure adjustment, and the direction of this oil flow is changed by the rectifying member. The flow direction changed by the rectifying member is the same as the oil flow flowing toward the suction port of the oil pump. Therefore, the oil flows smoothly toward the suction port of the oil pump, and the suction efficiency increases.
[0006]
【Example】
FIG. 1 shows a first embodiment of the present invention. A spool 12, a spring 14 and a sleeve 16 of the pressure regulator valve 11 are fitted in a spool hole provided in the valve body 10. An oil strainer 34 is attached to the lower surface of the valve body 10, and a passage from the opening 34a to the suction passage 10e of the valve body 10 is formed. The suction passage 10e is connected to a suction circuit 32 connected to a suction port of the oil pump 20. The oil strainer 34 has a net 34b for removing dust and the like on the upper surface thereof. The sleeve 16 of the pressure regulator valve 11 is fixed to the valve body 10 by a pin (not shown). The spool 12 is movable in the axial direction. The spool 12 has lands 12a, 12b, 12c and a shaft portion 12d. The lands 12b and 12c have the same diameter, but the land 12a has a smaller diameter. Also, the shaft portion 12d has a smaller diameter than the land 12b. The shaft portion 12 d is fitted with the inner diameter portion of the sleeve 16. The valve body 10 is provided with four slots 10a, 10b, 10c and 10d. The groove 10 a is configured such that the hydraulic pressure supplied thereto acts on the end of the land 12 a of the spool 12. The groove 10 a is connected to a discharge circuit 22 connected to a discharge port 20 b of the oil pump 20 through an orifice 18. A separate plate 24 is provided on the upper surface of the valve body 10, and another valve body (not shown) disposed above each groove and the separate plate 24 by providing a predetermined hole in the plate. Connection to the oil passage is made. The groove 10b is always open to the atmosphere, and no hydraulic pressure is applied. The groove 10c is located between the lands 12b and 12c of the spool 12 and is a drain groove provided with a drain port 26 on the lower side. A rectifying member 40 extending obliquely downward from the left side in FIG. 1 is provided below the drain port 26. The flow regulating member 40 is formed integrally with the valve body 10. The groove 10 d is provided at a position substantially corresponding to the land 12 c of the spool 12. The groove 10d is connected to the ejection circuit 22 described above. A chamber 28 formed between the land 12 c and the sleeve 16 (the spring 14 is disposed in the chamber 28) is always drained through the opening 30.
[0007]
Next, the operation of this embodiment will be described. When the oil pump 20 is not in operation, the spool 12 is pushed by the spring 14 and is in the state shown in the lower half of FIG. When the oil pump 20 starts operating from this state and outputs hydraulic pressure to the discharge circuit 22, the hydraulic pressure of the discharge circuit 22 acts on the groove 10a, and the spool 12 resists the force of the spring 14 in FIG. Move left. As a result, the land 12c is brought into a state where the groove 10d previously blocked is communicated with the groove 10c. Thereby, the oil supplied from the discharge circuit 22 to the groove 10d is discharged to the groove 10c, and the discharged oil is discharged to the outside of the valve body 10 through the drain port 26. At that time, the discharged oil is not discharged directly downward, but flows obliquely downward along the rectifying member 40. On the other hand, the operation of the oil pump 20 causes oil outside the oil strainer 34 to flow into the suction passage 10e through the opening 34a, and further reaches the suction port 20a through the suction circuit 32. Since the oil flow 46 from the opening 34a of the oil strainer 34 to the suction passage 10e and the oil flow 48 rectified by the rectifying member 40 are substantially in the same direction, the oil discharged from the drain port 26 Does not obstruct the flow of oil from the opening 34a of the oil strainer 34, and smoothly flows together. Therefore, the suction efficiency of the oil pump 20 is improved.
The operation of the pressure regulator valve 11 will be further described. If the hydraulic pressure acting on the groove 10a becomes too high, the spool 12 compresses the spring 14 and moves further to the left, so that it is discharged from the groove 10d to the groove 10c. The amount of oil increases. For this reason, the hydraulic pressure of the discharge circuit 22 is reduced, and the spool 12 moves by the force of the spring 14 so that the clearance formed by the end portion of the land 12c is reduced between the groove 10d and the groove 10c. On the contrary, if the clearance between the groove 10d and the groove 10c becomes too small, the amount of oil discharged through this clearance decreases, so that the hydraulic pressure of the discharge circuit 22 increases. As a result of such an operation, the hydraulic pressure of the groove 10a is adjusted to a constant value corresponding to the force of the spring 14.
[0008]
FIG. 2 shows a second embodiment of the present invention. In the second embodiment, the rectifying member 41 is a separate member from the valve body 10 and is fixed to the valve body 10. Also by this, the same operation as the first embodiment can be obtained.
[0009]
3 and 4 show the third and fourth embodiments of the present invention, respectively. In the third and fourth embodiments, the arrangement of the spool 12 of the pressure regulator valve 11 is 90 degrees different from the embodiment shown in FIG. In the case of this embodiment as well, by providing the rectifying members 42 and 43, the same operation as that of the above-described embodiment can be obtained.
[0010]
【The invention's effect】
As described above, according to the present invention, the rectifying member that rectifies the flow of oil discharged from the drain port of the pressure regulator valve so as to be in the same direction as the flow of oil flowing to the suction port of the oil pump is provided. Therefore, the flow of the sucked oil is not obstructed or disturbed, and the suction efficiency of the oil pump is improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment of the present invention.
FIG. 2 is a diagram showing a second embodiment of the present invention.
FIG. 3 is a diagram showing a third embodiment of the present invention.
FIG. 4 is a diagram showing a fourth embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Valve body 11 Pressure regulator valve 20 Oil pump 20a Suction port 20b Discharge port 34 Oil strainer 34a Opening part 40, 41, 42, 43 Rectification member

Claims (3)

It has an oil pump, an oil strainer, and a pressure regulator valve housed in the valve body, and the oil pump is configured to suck oil from the opening of the oil strainer into the suction port and discharge it to the discharge port. The pressure regulator valve is configured to adjust the discharge pressure of the oil pump by discharging a part of the oil of the oil pump discharge circuit from the valve body surface through the drain port provided in the valve body. by being configured as part of a suction passage of countercurrent oil flows What the suction port of the oil pump through the opening of the oil strainer along the valve body surface, the oil is discharged from the valve body surface in the stream Hydraulic control device for transmission configured to be In,
A rectifying member that changes the direction of the flow of oil discharged from the surface of the valve body through the drain port of the pressure regulator valve so as to be the same as the direction of the flow of oil flowing from the opening of the oil strainer toward the suction port of the oil pump. Is provided on the surface of the valve body . 2. The hydraulic control apparatus for a transmission according to claim 1, wherein the rectifying member is formed integrally with a valve body that houses a pressure regulator valve. 2. The hydraulic control apparatus for a transmission according to claim 1, wherein the rectifying member is constituted by a member different from the valve body that houses the pressure regulator valve, and is fixed to the valve body.

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