JP2018025267A - Lead valve and vane pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lead valve which can inhibit valve opening delay, and to provide a vane pump.SOLUTION: A lead valve 5 includes: a seat member 2 in which a valve hole 201b is opened; a valve 50 which is disposed at the outer side of the seat member 2, may elastically deform, and covers the valve hole 201b; and a stopper 51 which is disposed at the outer side of the valve 50 and can restrict an elastic deformation amount of the valve 50. The valve 50 includes a recessed part 501a, which partitions a gap A between itself and an opening edge 201c in a valve closed state, at a portion which faces at least a part of the opening edge 201c of the valve hole 201b.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a reed valve that regulates the backflow of fluid and a vane pump including the reed valve.

  A reed valve is attached to the housing of the vane pump (see, for example, Patent Document 1). The housing has a fixed hole and a discharge hole. A valve seat is disposed at the opening edge of the discharge hole. The valve of the reed valve is fixed to the fixing hole via a bolt. The valve can swing like a cantilever.

JP 2012-67730 A

  In the closed state, the valve is seated on the valve seat. The valve seals the discharge hole. Here, an oil film is interposed between the valve and the valve seat. For this reason, at the time of valve opening, it is difficult for the valve to leave the valve seat quickly. Therefore, valve opening delay occurs in the reed valve. Then, an object of this invention is to provide the reed valve and vane pump which can suppress valve opening delay.

  In order to solve the above problems, a reed valve according to the present invention includes a seat member having a valve hole, a valve disposed outside the seat member, elastically deformable and covering the valve hole, and the valve And a stopper that is capable of regulating the amount of elastic deformation of the valve, wherein the valve is closed at a position facing at least a part of the opening edge of the valve hole. A recess is provided to partition the gap with the opening edge.

  In the valve-closed state, a seal interface is formed between the seat member and the valve by seating the valve on the seat member. According to the present invention, it is easy to introduce pressure from the valve hole into the seal interface when the valve is opened. For this reason, the valve opening property of a valve can be improved.

It is a perspective view of the vane pump which is one Embodiment of the vane pump of this invention. It is a permeation | transmission right view of the same vane pump. It is the III-III direction sectional drawing of FIG. FIG. 4 is an enlarged view in a frame IV of FIG. 3. (A)-(d) is the left-right direction sectional drawing of the recessed part vicinity of the reed valve of other embodiment (the 1-the 4).

  Hereinafter, embodiments of the reed valve and the vane pump of the present invention will be described. In FIG. 1, the perspective view of the vane pump of this embodiment is shown. FIG. 2 shows a permeation right side view of the vane pump.

<Vane pump configuration>
First, the structure of the vane pump of this embodiment is demonstrated. As shown in FIGS. 1 and 2, the vane pump 1 includes a rotor 3, a vane 4, and a reed valve (check valve) 5. The reed valve 5 includes a housing 2, a valve (valve reed valve) 50 described later, a stopper (stopper reed valve) 51, and a fastening member 52.

(Housing 2)
The housing 2 is fixed to a side surface of the engine (not shown). The housing 2 includes a housing body 20, an end plate 21, and a pump chamber P. The housing body 20 has a bottomed elliptical cylindrical shape. The housing body 20 includes a peripheral wall part 200, a bottom wall part 201, an outer cylinder part 202, and an inner cylinder part 203.

  The peripheral wall 200 has an elliptical cylindrical shape. The bottom wall 201 is disposed at the right end (one axial end) of the peripheral wall 200. The bottom wall portion 201 includes a fixing hole 201a and a discharge hole 201b. The discharge hole 201b penetrates the bottom wall portion 201 in the left-right direction. The discharge hole 201b can be opened and closed from the right side (outside) by a reed valve 5 described later. The outer cylinder part 202 has a rectangular frame shape. The outer cylinder portion 202 is disposed on the right surface (outer surface) of the bottom wall portion 201. The outer cylinder portion 202 is attached to a window portion of an engine cam carrier (not shown). The inner cylinder portion 203 has a cylindrical shape. The inner cylinder part 203 is accommodated inside the outer cylinder part 202. A discharge hole 201b and a fixing hole 201a are arranged inside the frame of the outer cylinder part 202 and outside the frame of the inner cylinder part 203.

  As shown in FIG. 2, the pump chamber P is partitioned inside the housing 2. The pump chamber P has an elliptical shape when viewed from the left or right side. A booster device (not shown) of a brake device communicates with the pump chamber P via an intake passage (not shown). The pump chamber P communicates with the outside of the pump chamber P through the discharge hole 201b. The discharge hole 201b is arranged at the end of the pump chamber P in the forward rotation direction (counterclockwise direction in FIG. 2).

(Rotor 3, vane 4)
As shown in FIG. 2, the rotor 3 includes a rotor main body 30 and a shaft portion 31. The rotor body 30 has a bottomed cylindrical shape that opens to the left (inside). The rotor body 30 is accommodated in the pump chamber P. The rotor body 30 includes a pair of rotor groove portions 300. The shaft portion 31 continues to the right side of the rotor body 30. The shaft portion 31 is accommodated in the inner cylinder portion 203. The shaft portion 31 is connected to an engine camshaft (not shown) through a coupling (not shown) and an oil supply joint (not shown). The shaft portion 31, that is, the rotor 3 is rotatable around its own axis.

  The vane 4 has a rectangular plate shape. The vane 4 is accommodated in the pump chamber P. The vane 4 can rotate together with the rotor 3. The vane 4 can reciprocate in the diametrical direction along the pair of rotor grooves 300. The vane 4 can divide the pump chamber P into a plurality of working chambers according to the rotation angle.

(Reed valve 5)
As shown in FIG. 1, a rectangular valve mounting portion 22 is defined in the bottom wall portion 201. The valve mounting portion 22 is disposed inside the frame of the outer cylinder portion 202 and outside the frame of the inner cylinder portion 203. The reed valve 5 is disposed in the valve mounting portion 22.

  FIG. 3 shows a cross-sectional view in the III-III direction of FIG. FIG. 4 shows an enlarged view in the frame IV of FIG. The reed valve shown in FIGS. 3 and 4 is in a closed state. As shown in FIG. 3, the valve mounting portion 22 includes a fixing portion 220 and a seat portion 221. A fixing hole 201 a is recessed in the fixing portion 220. The sheet part 221 is connected to the lower side of the fixed part 220. The sheet portion 221 has a discharge hole 201b.

  As shown in FIG. 3, the reed valve 5 includes the housing 2, the valve 50, a stopper 51, and a fastening member 52. The valve 50 is made of metal and has a plate shape. The valve 50 is elastically deformable. The valve 50 includes a valve side fastened portion 500 and a free portion 501. A valve side insertion hole 500 a is formed in the valve side fastened portion 500. The valve side fastened portion 500 covers the fixed portion 220 from the right side. The free part 501 continues to the lower side of the valve side fastened part 500. In the valve closed state, the free part 501 covers the seat part 221 from the right side. That is, the free part 501 covers the discharge hole 201b so that it can be opened and closed from the right side. As shown in FIG. 4, a recess 501 a is provided in the left surface of the free part 501. The recess 501a covers the opening edge 201c on the right side of the discharge hole 201b from the right side over the entire circumference. For this reason, the opening edge 201c is separated from the left surface of the free part 501 on the entire circumference. A gap A is defined between the opening edge 201c and the left surface of the free portion 501. The included angle θ between the side surface of the recess 501a and the right surface of the sheet portion 221 is less than 90 °.

  As shown in FIG. 3, the stopper 51 is made of metal and has a plate shape. The stopper 51 is thicker than the valve 50. The stopper 51 is less elastically deformed than the valve 50. The stopper 51 includes a stopper side fastened portion 510 and a restricting portion 511. A stopper side insertion hole 510 a is formed in the stopper side fastened portion 510. The stopper side fastened portion 510 covers the valve side fastened portion 500 from the right side. The restricting portion 511 continues to the lower side of the stopper side fastened portion 510. In the closed state, the restricting portion 511 is separated from the right surface of the free portion 501. The restricting portion 511 restricts the valve opening amount (elastic deformation amount of the free portion 501) of the valve 50 in the valve open state (indicated by a dotted line in FIG. 3). That is, the free portion 501 can be elastically deformed between the right regulating portion 511 and the left seat portion 221.

  The fastening member 52 is a screw. The fastening member 52 includes a head portion 520 and a shaft portion 521. The head 520 applies a pressing force (axial force) to the stopper side fastened portion 510. The shaft portion 521 continues to the left side of the head 520. The shaft portion 521 passes through the stopper side insertion hole 510a and the valve side insertion hole 500a. The left end (through end) of the shaft portion 521 is screwed into the fixing hole 201a.

<Vane pump movement>
Next, the movement of the vane pump of this embodiment will be described. The vane 4 rotates in the counterclockwise direction in FIG. Lubricating oil is supplied to the pump chamber P via a predetermined oil passage (for example, an oil passage passing through the camshaft, the oil supply joint, the coupling, and the rotor from the upstream side to the downstream side). As the vane 4 rotates, the volumes of the plurality of working chambers partitioned into the pump chamber P change in size. Air and lubricating oil are discharged from the working chamber to the outside through the discharge hole 201b. The pressure of the working chamber compressed from the left side (inside) and the external pressure from the right side (outside) are applied to the free part 501 of the valve 50.

  When the pressure in the working chamber exceeds the pressure from the outside and the elastic force of the free part 501, the free part 501 is switched from the closed state shown by the solid line in FIG. 3 to the open state shown by the dotted line in FIG. Then, air and lubricating oil are discharged from the working chamber to the outside through the discharge hole 201b. When the pressure of the working chamber falls below the pressure from the outside and the elastic force of the free part 501 due to the discharge, the free part 501 switches from the valve open state to the valve closed state again.

<Effect>
Next, the effects of the reed valve and the vane pump of this embodiment will be described. As shown in FIG. 4, the valve 50 includes a free part 501. The valve mounting portion 22 of the housing 2 includes a seat portion 221. In the valve-closed state (a state where the free portion 501 (a portion other than the concave portion 501a) is seated on the seat portion 221), a seal interface B is formed between the free portion 501 and the seat portion 221. The seal interface B seals the discharge hole 201b. An oil film is formed in the vicinity of the opening edge 201c of the seal interface B by the lubricating oil discharged from the opening edge 201c in the valve open state (the state where the free part 501 is separated from the seat part 221). In the valve closed state, the free portion 501 is adsorbed to the seat portion 221 due to the surface tension of the oil film. For this reason, the free portion 501 is unlikely to be separated from the seat portion 221 when the valve is opened (when the free portion 501 is switched from the closed state shown by the solid line in FIG. 3 to the open state shown by the dotted line in FIG. 3). Become.

  In this regard, according to the reed valve 5 and the vane pump 1 of the present embodiment, the free portion 501 of the valve 50 is provided with the concave portion 501a at a location facing the entire circumference of the opening edge 201c of the discharge hole 201b. The recessed part 501a partitions the gap A between the opening edge 201c in the valve closed state. For this reason, as indicated by an arrow Y in FIG. 4, the pressure from the discharge hole 201 b (specifically, the pressure from the pump chamber P) can be easily introduced into the seal interface B when the valve is opened. Therefore, the seal interface B is easily separated (the oil film is easily peeled off). Therefore, the valve opening property of the reed valve 5 can be improved.

  Further, as indicated by a dotted line in FIG. 4, a burr C may protrude rightward from the opening edge 201c. If the left surface of the free part 501 has a flat shape (when the free part 501 does not include the recess 501a), the free part 501 is lifted by the burr C in the valve-closed state. For this reason, sealing performance will fall. In this regard, according to the reed valve 5 and the vane pump 1 of the present embodiment, the free portion 501 includes the recessed portion 501a. For this reason, even if the burr C is formed on the opening edge 201c, the burr C can be accommodated in the recess 501a in a state where the burr C does not contact the left surface of the recess 501a. Therefore, the sealing performance can be improved. Moreover, compared with the case where the left surface of the free part 501 is planar (when the free part 501 is not provided with the recessed part 501a), the internal pressure of the pump chamber P at the time of opening the valve is equal to the volume of the gap A. Can be lowered.

  Also, as shown in FIG. 4, the included angle θ between the side surface of the recess 501a and the right surface of the sheet portion 221 is set to be less than 90 °. For this reason, it becomes easy to introduce the pressure from the discharge hole 201b to the seal interface B when the valve is opened.

<Others>
The embodiment of the reed valve and the vane pump according to the present invention has been described above. However, the embodiment is not particularly limited to the above embodiment. Various modifications and improvements that can be made by those skilled in the art are also possible.

  The shape or the like of the recess 501a (that is, the gap A) (shape (such as the included angle θ shown in FIG. 4), volume, position, number of arrangements, etc.) is not particularly limited. FIG. 5A to FIG. 5D are cross-sectional views in the left-right direction (inside and outside direction) in the vicinity of the recess of the reed valve of other embodiments (No. 1 to No. 4). In addition, about the site | part corresponding to FIG. 4, it shows with the same code | symbol. Moreover, the site | part shown to Fig.5 (a)-FIG.5 (d) respond | corresponds to the site | part shown in FIG.

  In FIG. 4, a portion of the right surface of the free portion 501 facing away from the concave portion 501a on the left surface protrudes to the right by the amount of the immersion of the concave portion 501a. However, as shown in FIG. 5A, the portion of the right surface of the free portion 501 facing away from the concave portion 501a on the left surface may be planar. That is, it does not have to protrude to the right side. If it carries out like this, the plate | board thickness of the free part 501 can be made thin. Moreover, the lift amount of the free part 501 in the valve open state can be increased (see FIG. 3).

  The free part 501 may be provided with a recess 501a only at a location facing a part of the opening edge 201c. The concave portion 501a may be disposed in a portion where it is desired to promote separation from the seat portion 221. For example, as shown in FIG. 5B, of the opening edge 201c, the lower portion where the free portion 501 is difficult to be separated (the portion on the free end side. Of the portion below the center of gravity of the opening edge 201c, You may arrange | position the recessed part 501a only to the part including a lower end at least. Moreover, you may arrange | position the recessed part 501a only in the location facing the part which the burr | flash C (refer FIG. 4) tends to generate | occur | produce among the opening edges 201c. For example, on the opposite side of FIG. 5B, the upper edge of the opening edge 201c where the burrs C are likely to occur (a part on the fixed end side. At least the upper end of the part above the center of gravity of the opening edge 201c is included. The concave portion 501a may be disposed only in the portion). When arranging the plurality of recesses 501a, the difference in shape and volume of the plurality of recesses 501a is not particularly limited.

  As shown in FIG. 5C, the discharge hole 201b may include a chamfered portion 201d. In this case, the opening edge 201c refers to the boundary between the right surface of the sheet portion 221 and the chamfered portion 201d. When the chamfered portion 201d is arranged, the pressure from the discharge hole 201b is easily introduced into the seal interface B when the valve is opened. For this reason, the openability of the reed valve can be improved. The shape of the chamfered portion 201d may be a chamfered shape (see FIG. 5C) or a round chamfered shape.

  As illustrated in FIG. 5D, the convex portion 221 a may be disposed in the vicinity of the opening edge 201 c in the sheet portion 221. When the convex portion 221a is disposed, the area of the seal interface B in the valve closed state can be reduced. For this reason, the openability of the reed valve can be improved.

  1: vane pump, 2: housing, 3: rotor, 4: vane, 5: reed valve, 20: housing body, 21: end plate, 22: valve mounting portion, 30: rotor body, 31: shaft portion, 50: valve , 51: stopper, 52: fastening member, 200: peripheral wall portion, 201: bottom wall portion, 201a: fixing hole, 201b: discharge hole, 201c: opening edge, 201d: chamfered portion, 202: outer cylinder portion, 203: Inner cylinder part, 220: fixed part, 221: seat part, 221a: convex part, 300: rotor groove part, 500: valve side fastened part, 500a: valve side insertion hole, 501: free part, 501a: concave part, 510: Stopper side fastening portion, 510a: stopper side insertion hole, 511: restriction portion, 520: head, 521: shaft portion, A: gap, B: seal interface, C: burr, P: pump chamber, θ: included angle

Claims (4)

A seat member having a valve hole;
A valve disposed outside the seat member, elastically deformable, and covering the valve hole;
A stopper disposed outside the valve and capable of regulating the amount of elastic deformation of the valve;
A reed valve comprising:
2. The reed valve according to claim 1, wherein the valve is provided with a recess that divides a gap between the valve hole and the opening edge at a position facing at least a part of the opening edge of the valve hole.   The reed valve according to claim 1, wherein the concave portion covers the opening edge of the valve hole from the outside on the entire circumference.   The reed valve according to claim 1 or 2, wherein an included angle between a side surface of the recess and an outer surface of the seat member is less than 90 °.   A reed valve according to any one of claims 1 to 3, and a housing that divides a pump chamber therein, wherein the seat member is the housing, and the valve hole communicates with the pump chamber. Vane pump that is a hole.

Images