JP2019167984A - Relief valve - Google Patents

Abstract

To prevent reluctance of a valve body to slide.SOLUTION: A relief valve 1 includes: a housing 2 provided with a main passage 3 in which a fluid flows and a relief passage 6 connected to the main passage 3; a valve body 7 which closes the relief passage 6 when the main passage 3 is slid in a right direction R and opens the relief passage 6 when the main passage 3 is slid in a left direction L; and a stopper 10 which contacts with the valve body 7 to restrict sliding of the valve body 7 in the left direction L. The valve body 7 has a through hole 11 which connects the main passage 3 at the upstream side of the valve body 7 to the main passage 3 at the downstream side of the valve body 7. The stopper 10 is provided so that its outer peripheral surface does not contact with an inner peripheral surface of a wall of the housing 2 which forms the main passage 3.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a relief valve.

  2. Description of the Related Art A relief valve that releases oil when oil pressure of oil (lubricating oil) pumped up by an oil pump and supplied to an internal combustion engine exceeds a predetermined value is known (for example, see Patent Document 1).

  Generally, a relief valve includes a main flow path in which a valve body slides and a relief flow path opened and closed by the valve body inside the casing. The valve body closes the relief flow path when the hydraulic pressure is less than a predetermined value, and slides in the main flow path when the hydraulic pressure exceeds a predetermined value. As a result, the relief channel is opened, and the oil is discharged to the outside of the relief valve via the relief channel.

JP 2012-17798 A

  However, in the conventional relief valve, foreign matter (for example, iron powder) in the oil enters between the outer peripheral surface of the valve body and the inner peripheral surface of the main flow path, and there is a problem that the sliding of the valve body is awkward. is there. In particular, when the internal combustion engine is new, a large amount of iron powder is generated in the oil, so that the above problem is likely to occur.

  The objective of this indication is providing the relief valve which can prevent the astringency of sliding of a valve body.

  A relief valve according to an aspect of the present disclosure includes a housing provided with a main flow path through which a fluid flows and a relief flow path connected to the main flow path, and when the main flow path is slid in a first direction. When the relief flow path is closed and the main flow path is slid in the second direction, the valve body opens the relief flow path, and comes into contact with the valve body in the second direction of the valve body. A relief valve provided with a stopper for restricting sliding of the valve body, wherein the valve body penetrates a main flow path upstream of the valve body and a main flow path downstream of the valve body. The stopper is provided so that the outer peripheral surface of the stopper does not contact the inner peripheral surface of the wall of the casing forming the main flow path.

  According to the present disclosure, it is possible to prevent the sliding of the valve body.

Sectional drawing which shows the inside of the relief valve which concerns on embodiment of this indication Sectional drawing which shows the inside of the relief valve which concerns on embodiment of this indication Sectional drawing which shows the inside of the relief valve which concerns on the comparative example of this indication

  Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

<Relief valve configuration>
First, the configuration of the relief valve 1 according to the embodiment of the present invention will be described with reference to FIG.

  FIG. 1 is a cross-sectional view showing the inside of a relief valve 1 according to the present embodiment. Moreover, FIG. 1 has shown the case where the relief flow path 6 is a closed state. 1 indicates the longitudinal direction of the relief valve 1. In the following description, the direction L is “left direction” (an example of the second direction) or “downstream”, and the direction R is “right direction”. (An example of the first direction) or “upstream”. Further, the longitudinal direction of the relief valve 1 is also referred to as a “left-right direction” as appropriate.

  A relief valve 1 shown in FIG. 1 is a valve mounted on, for example, a vehicle, through which oil supplied to an internal combustion engine (not shown, the same applies hereinafter) of the vehicle flows.

  In the present embodiment, the case where the fluid flowing through the relief valve 1 is oil will be described as an example. However, the present invention is not limited to this, and may be a liquid other than oil or a gas. Good.

  The relief valve 1 is provided in, for example, an oil pan or a crankcase (both not shown, the same applies hereinafter), but is not limited thereto.

  As shown in FIG. 1, a main flow path 3 is formed in the housing 2 of the relief valve 1 along the longitudinal direction of the relief valve 1.

  Further, a flow path 4, a flow path 5, and a relief flow path 6 are formed inside the housing 2 so as to communicate with the main flow path 3. The relief flow path 6 is formed through the housing 2.

  The main flow path 3, the flow paths 4, 5 and the relief flow path 6 are, for example, cylindrical. The oil flow in each flow path will be described later.

  In the main flow path 3, a cylindrical valve body 7 is provided on the downstream side of the flow path 5.

  A through hole 11 is formed in the valve body 7 along the longitudinal direction of the relief valve 1. The through hole 11 is a flow path that connects the main flow path 3 upstream of the valve body 7 and the main flow path 3 downstream of the valve body 7.

  Further, the valve body 7 is formed with an internal space 7 a communicating with the through hole 11. The internal space 7a and the through hole 11 function as an oil flow path.

  A spring 8 is attached to the valve body 7.

  The valve body 7 slides in the left-right direction along the main flow path 3. The sliding of the valve body 7 in the right direction is limited by the stopper 9, and the sliding of the valve body 7 in the left direction is limited by the stopper 10. Details of sliding of the valve body 7 will be described later.

  The stopper 10 is, for example, a cylindrical member. The downstream end of the stopper 10 is fixed to the member 2a (one of the members constituting the housing 2). The upstream end of the stopper 10 abuts against the wall surface of the valve body 7 on the inner space 7a side when the valve body 7 slides leftward.

  The stopper 10 is provided such that its outer peripheral surface does not contact the inner peripheral surface of the wall of the housing 2 that forms the main flow path 3 (hereinafter also referred to as the inner peripheral surface of the main flow path 3). Therefore, the outer diameter of the stopper 10 is smaller than the inner diameter of the main flow path 3.

  Moreover, the inner diameter of the stopper 10 is larger than the diameter of the through hole 11 and larger than the diameter of the through hole 12 described later.

  The length of the stopper 10 in the longitudinal direction (left-right direction in the figure) is not limited to the length shown in FIG. That is, the length of the stopper 10 may be a length that allows part or all of the relief flow path 6 to be opened when the valve body 7 hits the stopper 10.

  Moreover, the stopper 10 may be provided integrally with the member 2a, or may be provided detachably with respect to the member 2a.

  Further, the relief valve 1 is formed with a through hole 12, a flow path 13, and a flow path 14. These flow paths are, for example, cylindrical.

  The through hole 12 is formed in the member 2 a and is a flow path that connects the main flow path 3 and the flow path 13.

  The flow path 13 is formed along the longitudinal direction of the relief valve 1. The flow path 13 communicates with a flow path 14 connected to the outside of the relief valve 1.

  A spherical valve body 15 and a substantially cylindrical valve body 16 are provided in the flow path 13.

  A spring 17 is attached to the valve body 16.

  The valve body 16 slides along the flow path 13 in the left-right direction. When the solenoid 18 is energized, the valve body 16 slides in the left direction in the flow path 13. On the other hand, when the solenoid 18 is in a non-energized state, the valve body 16 slides in the right direction by the biasing force of the spring 17 in the right direction.

  The solenoid 18 is controlled to either an energized state or a non-energized state based on a control signal from an ECU (Electric Control Unit) (not shown), for example.

  When the valve element 16 slides to the right, the spherical valve element 15 is pushed by the valve element 16 and moves to the right as shown in FIG.

  On the other hand, when the valve body 16 slides leftward, the spherical valve body 15 is released from being pressed by the valve body 16 and moves leftward to open the through hole 12 (see FIG. 2 described later). .

  The configuration of the relief valve 1 according to the present embodiment has been described above.

<Relief valve operation>
Next, the operation of the relief valve 1 will be described with reference to FIGS. FIG. 2 is a cross-sectional view showing the inside of the relief valve 1 as in FIG. Moreover, FIG. 2 has shown the case where the relief flow path 6 is an open state. In FIG. 2, the same components as those in FIG. 1 are denoted by the same reference numerals.

  First, the operation when the solenoid 18 is in a non-energized state will be described with reference to FIG.

  When the solenoid 18 is in a non-energized state, as shown in FIG. 1, the valve body 16 is urged by the spring 17 to slide rightward in the flow path 13 and presses the spherical valve body 15 against the member 2 a. Thereby, the through hole 12 is closed.

  In this state, oil pumped up from an oil pan by an oil pump (not shown, the same applies hereinafter) flows into the flow path 4 through a predetermined flow path (not shown) and then flows into the main flow path 3.

  Most of the oil that flows into the main flow path 3 from the flow path 4 flows out of the relief valve 1 from the flow path 5. Thereafter, the oil is supplied to the internal combustion engine via a predetermined flow path (not shown) connected to the flow path 5.

  On the other hand, part of the oil that has flowed into the main flow path 3 from the flow path 4 flows into the internal space 7 a from the through hole 11 of the valve body 7. Since the through hole 12 is closed as shown in FIG. 1, the oil does not flow into the flow path 13, but accumulates in the internal space 7 a and the main flow path 3 on the downstream side of the internal space 7 a.

  At this time, the hydraulic pressure downstream of the upstream end of the valve body 7 is equal to the hydraulic pressure upstream of the upstream end of the valve body 7. At this time, as shown in FIG. 1, the valve element 7 is urged by the spring 8 and slides to the right, contacts the stopper 9, and closes the relief flow path 6.

  Next, the operation when the solenoid 18 is energized will be described with reference to FIG.

  When the solenoid 18 is energized, the valve body 16 slides leftward in the flow path 13 as shown in FIG. Thereby, the spherical valve body 15 is released from being pressed by the valve body 16, and moves to the left. Therefore, the through hole 12 is opened.

  The oil accumulated in the internal flow path 7a and the main flow path 3 on the downstream side of the internal space 7a flows into the flow path 13 from the through hole 12, and flows out of the relief valve 1 from the flow path 14. Thereafter, the oil is returned to, for example, an oil pan through a predetermined flow path (not shown).

  Thus, when oil flows out of the relief valve 1 through the through hole 12, the flow path 13, and the flow path 14, the hydraulic pressure downstream of the upstream end of the valve body 7 is the upstream end of the valve body 7. It becomes lower than the oil pressure upstream. Therefore, as shown in FIG. 2, the valve body 7 moves to the left in the main flow path 3, comes into contact with the stopper 10, and opens the relief flow path 6.

  At this time, as shown in FIG. 2, the stopper 10 comes into contact with the peripheral portion of the downstream opening of the through hole 11 in the valve body 7. As a result, the oil that has flowed from the through hole 11 passes through the stopper 10 and flows into the through hole 12.

  When the relief flow path 6 is opened, a part of the oil flowing through the main flow path 3 flows out of the flow path 5 and the rest flows out of the relief flow path 6. The oil that flows out from the relief flow path 6 to the outside of the relief valve 1 is returned to, for example, an oil pan.

  The operation of the relief valve 1 has been described above.

<Effects of relief valve>
Next, the effect of the relief valve 1 of this Embodiment is demonstrated.

  A configuration of a relief valve 1a, which is a comparative example of the relief valve 1, will be described with reference to FIG. FIG. 3 is a cross-sectional view showing the inside of the relief valve 1a. Moreover, FIG. 3 has shown the case where the relief flow path 6 is a closed state. In FIG. 3, the same reference numerals are given to components common to FIGS. 1 and 2. In the following, description of these common components is omitted.

  The relief valve 1a differs from the relief valve 1 in that a stopper 10a is provided instead of the stopper 10 shown in FIGS.

  The stopper 10a is a cylindrical member. The outer peripheral surface of the stopper 10 a is in contact with the inner peripheral surface of the main flow path 3.

  It is assumed that the relief valve 1a having such a configuration is installed and used so that its longitudinal direction is horizontal. In that case, the iron powder contained in the oil tends to accumulate in the space A between the stopper 10 a and the valve body 7.

  The iron powder accumulated in the space A is repeatedly brought into contact with the valve body 7 and the stopper 10a, so that the space between the outer peripheral surface of the valve body 7 and the inner peripheral surface of the main flow path 3 (hereinafter referred to as a first gap). ) Thereby, astringency arises in the sliding of the valve body 7. FIG.

  Further, the iron powder accumulated in the space A is repeatedly brought into contact with the valve body 7 and the stopper 10a, so that the gap between the outer peripheral surface of the stopper 10a and the inner peripheral surface of the main flow path 3 (hereinafter referred to as a second gap). Also). Then, when the second gap is filled with the iron powder, the iron powder accumulated in the space A easily enters the first gap.

  Thus, in the relief valve 1a, since the outer peripheral surface of the stopper 10a is in contact with the inner peripheral surface of the main flow path 3, the iron powder easily enters the first gap and the second gap, and the sliding of the valve body 7 occurs. It tends to cause astringency.

  On the other hand, in the relief valve 1 of the present embodiment, as shown in FIGS. 1 and 2, the stopper 10 has an outer peripheral surface on the inner peripheral surface of the wall of the housing 2 that forms the main flow path 3. It is provided not to touch. Therefore, as shown in FIG. 2, the valve body 7 and the stopper 10 abut at a position away from the inner peripheral surface of the main flow path 3. Therefore, iron powder collected on the inner peripheral surface of the main flow path 3 on the downstream side of the downstream end of the valve body 7 is less likely to enter the first gap.

  Further, even if iron powder enters the first gap, a space wider than the space A shown in FIG. 3 is secured on the downstream side of the downstream end of the valve body 7 as shown in FIG. Therefore, it is easy for iron powder to go out of the first gap.

  Accordingly, the relief valve 1 can prevent the sliding of the valve element 7 caused by the foreign matter contained in the oil.

  It should be noted that the present disclosure is not limited to the above-described embodiment, and can be appropriately modified and implemented without departing from the spirit of the present disclosure.

  In the embodiment, the case where the relief valve 1 is a valve that slides based on electrical control (for example, energization / non-energization control of the solenoid 18) has been described as an example. It may be a valve that slides without requiring automatic control.

  Moreover, the relief valve 1 does not need to be provided with the component (it attached | subjected the code | symbols 13-18) downstream from the through-hole 12 among the components shown in FIG. 1, FIG. In that case, the same solenoid as the solenoid 18 may be provided in the vicinity of the valve body 7, and the sliding of the valve body 7 may be controlled similarly to the valve body 16 in accordance with energization / non-energization of the solenoid.

  The relief valve of the present disclosure is useful for a valve capable of releasing fluid when the fluid is at high pressure.

DESCRIPTION OF SYMBOLS 1, 1a Relief valve 2 Case 2a Member 3 Main flow path 4, 5, 13, 14 Flow path 6 Relief flow path 7, 16 Valve body 7a Internal space 8, 17 Spring 9, 10, 10a Stopper 11, 12 Through hole 15 Spherical valve body 18 Solenoid

Claims (4)

A housing provided with a main flow path through which a fluid flows and a relief flow path connected to the main flow path; and when the main flow path slides in a first direction, the relief flow path is closed, and the main flow path is A valve body that opens the relief flow path when slid in a second direction; and a stopper that restricts sliding of the valve body in the second direction by contacting the valve body. Relief valve,
The valve body is
A through hole that connects the main flow path upstream of the valve body and the main flow path downstream of the valve body;
The stopper is
The outer peripheral surface of the stopper is provided so as not to contact the inner peripheral surface of the wall of the housing forming the main flow path.
Relief valve. The stopper is cylindrical,
The inner diameter of the stopper is larger than the diameter of the through hole,
The relief valve according to claim 1. The stopper is
Abuts on the peripheral portion of the downstream opening of the through hole;
The relief valve according to claim 1 or 2. A solenoid that is energized or de-energized;
The valve body is
When the solenoid is in a non-energized state, sliding in the first direction closes the relief flow path,
When the solenoid is energized, sliding in the second direction to open the relief flow path;
The relief valve according to any one of claims 1 to 3.

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