JPH0444870Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a flow rate control device for an oil pump installed in an internal combustion engine for an automobile.

Conventional technology As a conventional oil pump flow control device,
A device as shown in FIG. 4 is known (see, for example, Japanese Utility Model Application Publication No. 122469/1983).

This flow rate control device includes a housing 1 having a substantially cylindrical valve accommodation chamber 2 therein, and a lubricating oil discharge passage 3 that opens from a substantially axial direction with respect to the valve accommodation chamber 2.
A lubricating oil suction passage 4 is formed in the valve housing chamber 2 and opens from a substantially radial direction. A cylindrical member 6 into which the valve body 5 is slidably inserted is provided. A relief spring 8 is elastically mounted inside the cylindrical member 6 and has one end in contact with a tail plug 7 that seals the open end of the cylindrical member 6 and urges the valve body 5 toward the discharge passage 3 side. Furthermore, the cylindrical member 6
As shown in FIG. 5, an annular groove 9 is formed in the outer wall where the opening 4a of the suction passage 4 is located, and four grooves are formed at equal intervals in the circumferential direction of the annular groove 9.
Two communication holes 10 are bored along the radial direction of the valve housing chamber 2.

When the discharge pressure of the discharge passage 3 is below the set value, the valve body 5 is biased by the spring force of the relief spring 8 to the position shown by the two-dot chain line in the figure, and the valve body 5 is biased to the position shown by the two-dot chain line in the figure. This closes the suction passage 4, thereby forcing the entire amount of lubricating oil in the discharge passage 3 to be delivered to each friction part of the internal combustion engine via the supply passage 11 that opens into the discharge passage 3. On the other hand, when the discharge pressure in the discharge passage 3 exceeds the set value, the relief spring 8
The valve body 5 is moved from the two-dot chain line position to the solid line position in FIG. 4 against the spring force of the communication hole 10...
...and the discharge passage 3 and the suction passage 4 via the annular groove 9.
are communicated with each other, thereby allowing surplus lubricating oil of the lubricating oil in the discharge passage 3 to flow back to the suction passage 4 side. In addition, 12 in the figure is a relief spring side chamber 2a which is a component of the valve housing chamber 2.
This is a relief passage that communicates with the suction passage 4 side.

Problems to be Solved by the Invention However, in the conventional flow rate control device described above, since the communication hole 10 is formed along the radial direction with respect to the valve housing chamber 2, as shown in FIG. When surplus lubricating oil in the discharge passage 3 flows into the annular groove 9 from the communication hole 10, the discharge pressure from the communication hole 10 other than the suction passage 4 side increases, and the head 5 of the valve body 5
a receives an uneven load due to the discharge pressure and the suction passage 4
It leans to the side. Then, the valve body 5 moves to the right in the valve housing chamber 2 while maintaining the tilted state, that is, the valve body 5 moves to the right while being in pressure contact with the inner wall surface of the valve housing chamber 2, so that the valve body 5 moves to the right in the valve housing chamber 2. There is a problem in that this phenomenon occurs and the valve body 5 cannot operate smoothly and the flow rate control device deteriorates.

Means for Solving the Problems This invention was devised in view of the problems of the conventional device described above, and includes a plurality of grooves connected to the annular groove on the inner wall of the valve housing chamber formed in the housing on the discharge passage side. It is characterized in that a passage groove is formed along the axial direction.

According to this invention having the above configuration, the discharge pressure of the fluid becomes higher than the set pressure, and the discharge pressure causes the valve body to move against the spring force of the relief spring, so that the discharge passage and the suction passage are mutually connected to each other. When the communication state is established, the fluid in the discharge passage flows through each passage groove in the axial direction at a substantially uniform flow rate, and returns to the suction passage side via the annular groove. Therefore, when the fluid flows into each of the passage grooves, the discharge pressure of the fluid is applied almost uniformly over the entire outer circumference of the head of the valve body, resulting in an uneven load on the head of the valve body, that is, an uneven load on the suction passage side of the head. This prevents the vehicle from tilting to the opposite direction.

Embodiments Hereinafter, embodiments of this invention will be described based on the drawings. Note that the same reference numerals are given to the same components as those of the conventional example.

FIG. 1 is a sectional view of a main part of an embodiment of an oil pump flow rate control device according to this embodiment, and FIG. 2 is a sectional view taken along the line -- in FIG.

That is, inside the valve housing 1, there is a substantially cylindrical valve housing chamber 2, and a discharge passage 3 for lubricating oil, which is a fluid, that opens from the approximately axial direction with respect to the valve housing chamber 2.
A supply passage 11 that opens into the discharge passage 3 and supplies lubricating oil in the discharge passage 3 to each friction part of the internal combustion engine, and a suction passage 4 that opens from the substantially radial direction to the valve housing chamber 2 are formed, respectively. A cylindrical valve body 5 having a substantially disc-shaped head 5a is slidably inserted into the valve housing chamber 2, and the opening end is closed by a tail plug 7. It's blocked.
Further, a relief spring 8 is mounted between the tail plug 7 and the valve body 5 to urge the valve body 5 toward the discharge passage 3 side.

Further, an annular groove 10 communicating with the suction passage 4 is formed on the inner wall of the valve housing chamber 2, and an annular groove 10 communicating with the suction passage 4 is formed on the inner wall on the side of the discharge passage 3.
A passage groove 21 is formed along the axial direction to communicate the annular groove 10 with the annular groove 10.
Four valves are formed on the inner wall of the valve housing chamber 2 at equal intervals in the circumferential direction.

Reference numeral 12 in the figure is a relief passage that communicates the relief spring side chamber 2a of the valve housing chamber 2 with the suction passage 4, and this relief passage 12 is connected to the relief spring side chamber 2a as the valve body 5 moves rightward in the figure. The lubricating oil is released into the suction passage 4 to prevent reaction force of the lubricating oil against the valve body 5.

Next, the operation of this embodiment will be explained.

First, when the discharge pressure of lubricating oil discharged from an oil pump (not shown) is less than a set value in the discharge passage 3, the spring force of the relief spring 8 moves the valve body 5 as indicated by the two-dot chain line in FIG. the valve body 5 to close the suction passage 4,
As a result, the entire amount of lubricating oil in the discharge passage 3 is force-fed to each friction part of the internal combustion engine via the supply passage 11 that opens into the discharge passage 3.

On the other hand, when the discharge pressure in the discharge passage 3 exceeds the set value, the discharge pressure resists the spring force of the relief spring 8 and causes the valve body 5 to move at point 2 in FIG.
The discharge passage 3 and the suction passage 4 are made to communicate with each other via the plurality of passage grooves 21 . Among the lubricating oils, surplus lubricating oil is returned to the suction passage 4. in this case,
When the lubricating oil flows into each passage groove 21..., the discharge pressure of the excess lubricating oil can be applied substantially uniformly over the entire outer circumference of the head 5a of the valve body 5. An unbalanced load on the valve body 5 can be prevented, and the valve body 5 can be prevented from tilting. Therefore, the valve body 5
It is possible to prevent the head 5a from coming into pressure contact with the inner wall surface of the valve housing chamber 2 during movement in the right direction in the figure, thereby preventing the so-called stuck phenomenon from occurring.

Next, FIG. 3 shows another example of the relief passage in the above embodiment. In this embodiment, an annular relief groove 22 is formed near the center of the outer periphery of the valve body 5, and a predetermined position of the relief groove 22 is formed. A plurality of first relief holes 23 are formed at equal intervals along the radial direction, while a second relief hole 24 having a rectangular cross section and communicating with the suction passage 4 is formed on the side of the suction passage 4. However, when the valve body 5 moves to the right as shown in the figure,
The first relief hole 23, the relief groove 22, and the second relief hole 24 form the relief spring side chamber 2a.
and the suction passage 4 are communicated with each other.
Note that the other configurations are the same as the embodiment shown in FIG. Therefore, not only can the same effects as in the above-mentioned embodiments be obtained, but also the relief hole 24 provided in the housing 1 can be integrally formed by casting instead of drilling with a drill or the like. becomes easier.

In addition, in each of the above embodiments, the annular groove 10 and the passage groove 21
is formed on the inner wall of the valve accommodating chamber 2, that is, the housing 1, but is not limited thereto; for example, as shown in the conventional example above, it may be formed on a cylindrical member disposed between the valve accommodating chamber and the housing. It is also possible.

In addition, in the embodiment shown in FIG. 3, the valve body 5
The sliding range of the relief groove 22 and the second relief hole 24
Either the spring pressure of the relief spring 8 is set within a range where the valve element 5 is in communication with the valve element 5, or the relief groove 22 and the second relief hole 24 are formed at predetermined positions so that they communicate even at the maximum rightward movement position of the valve body 5. It's summery.

Effects of the invention As is clear from the above explanation, according to the oil pump flow rate control device according to the invention, the fluid in the discharge passage is controlled by a plurality of passage grooves formed along the axial direction on the inner wall of the valve housing chamber. Since the valve body is circulated and refluxed to the suction passage side, it is possible to prevent the valve body from tilting within the valve housing chamber due to an unbalanced load of the discharge pressure, and it is therefore possible to prevent the occurrence of the stuck phenomenon of the valve body. As a result, smooth sliding movement of the valve body can be obtained at all times, and flow control performance can be improved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of essential parts showing one embodiment of the oil pump flow rate control device according to this invention, FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. FIG. 4 is a sectional view showing a conventional flow rate control device, and FIG. 5 is a sectional view taken along the - line in FIG. 4. DESCRIPTION OF SYMBOLS 1... Housing, 2... Valve accommodation chamber, 3... Discharge passage, 4... Suction passage, 5... Valve body, 8... Relief spring, 10... Annular groove, 21... Passage groove.

Claims (1)

[Scope of utility model registration request] A housing having a valve accommodating chamber therein is formed with a discharge passage that opens approximately axially to the valve accommodating chamber, and a suction passage that opens approximately radially to the valve accommodating chamber, and a suction passage that opens approximately radially to the valve accommodating chamber. A valve body for closing the discharge passage is slidably housed in the housing chamber under axial biasing by a relief spring, and an annular groove communicating with the suction passage is formed in an inner wall of the valve housing chamber. When the discharge pressure in the discharge passage exceeds a set value, the valve body is moved in the axial direction against the spring force of the relief spring, and the discharge passage and the suction passage are connected through the annular groove. A flow rate control device for an oil pump that communicates with the fluid in the discharge passage and causes a part of the fluid in the discharge passage to flow back to the suction passage side, wherein a plurality of passage grooves that communicate with the annular groove are provided on an inner wall of the valve housing chamber on the discharge passage side. A flow control device for an oil pump, characterized in that the flow rate control device is formed along the axial direction.