JPH0118182Y2 - - Google Patents

Description

[Detailed description of the invention] A. Purpose of the invention (1) Industrial application field The present invention relates to a filter device used in a hydraulic circuit or the like.

(2) Prior Art Conventionally, in such a filter device, the filter is arranged almost horizontally, and dust and foreign matter are always attached to the filter surface.

(3) Problems to be solved by the invention Due to dust and foreign matter constantly adhering to the surface of the filter, the filter becomes clogged in a relatively short period of time, increasing flow path resistance.

The present invention was developed in view of such circumstances, and is designed to avoid as much as possible the adhesion of dust and foreign matter to the filter surface, and to minimize the increase in flow path resistance due to filter clogging. The purpose of the present invention is to provide a filter device that achieves the following.

B. Structure of the invention (1) Means for solving the problems According to the invention, a bottomed hole is bored in the main body with the open end facing upward, and one end of the bottomed hole is closed. A cylindrical filter having an opening at the other end communicating with the downstream fluid passage forms an annular chamber between the inner surface of the bottomed hole and a foreign matter storage portion between the one end and the bottom of the bottomed hole. A magnet is disposed in the filter at a portion close to the foreign matter storage portion, and the upstream fluid passage is opened at a side surface of the bottomed hole facing the annular chamber.

(2) Effect Dust and foreign matter mixed in the fluid flow into the annular chamber, are filtered by a filter, and then sink in the inclined annular chamber and accumulate in the foreign matter storage section. If the iron powder is mixed in with the foreign matter, the magnet collects the iron powder in the foreign matter storage section.

(3) Embodiment Hereinafter, an embodiment in which the device of the present invention is integrated into a hydraulic pump will be explained with reference to the drawings. In FIGS. 1 and 2, the main body 2 of the hydraulic pump 1 has a , a motor (not shown) is integrally fixed, and the output shaft of the motor is connected to the gear reducer 3.
It is connected to the drive shaft 4 via. By rotationally driving the drive shaft 4, the plunger 5 is driven to reciprocate in a direction perpendicular to the axis of the drive shaft 4, and accordingly, hydraulic oil is sucked into the pump chamber 7 via the suction check valve 6. The liquid is then discharged from the pump chamber 7 through the discharge pipe 10 via the discharge check valve 8 and the filter device 9 of the present invention.

The drive shaft 4 is rotatably supported by the main body 2 via a bearing 11, and the drive shaft 4 projects into a rotating chamber 12 formed within the main body 2. Further, a cam 13 is provided at the protruding end of the drive shaft 4, and the cam 13 has a shaft portion 4a that projects parallel to the axis at a position offset from the axis of the drive shaft 4, and a shaft portion 4a that is connected to the shaft portion 4a. The ball bearing 14 is supported by an E-shaped retaining ring 15 on the shaft portion 4a.
Therefore, the distance from the axis of the drive shaft 4 to the outer peripheral surface of the ball bearing 14 at a certain position along the circumferential direction of the drive shaft 4 changes according to the rotational movement of the drive shaft 4.

A hole 16 having an axis perpendicular to the axis of the drive shaft 4 is bored in the main body 2 between the outer surface of the main body 2 and the rotating chamber 12 . A female threaded portion 18 is formed in a portion of the hole 16 near the external open end through a step surface 17 that faces the open end side and forms a step.
2, there is a stepped surface 1 facing the open end side.
A small diameter portion 20 is provided via 9.

A metal sleeve 21 is inserted into the hole 16, and by screwing the discharge check valve unit 22 into the female threaded portion 18 and tightening the sleeve 21, the stepped surface 19 and the discharge check valve unit 22 are connected to each other. It is compressed and supported between. Moreover, the discharge check valve unit 2
2 into the hole 16, the discharge check valve 8 is constructed.

The sleeve 21 includes a cylindrical portion 25 that is inserted into the hole 16 via a pair of O-rings 23 and 24 and has one end in contact with the stepped surface 19, and a small cylindrical portion 26 that is concentrically connected to one end of the cylindrical portion 25. The small cylindrical portion 26 is inserted concentrically into the small diameter portion 20 of the hole 16. A sliding hole 27 is provided in this sleeve 21 over its entire length, and the plunger 5 is slidably fitted into the sliding hole 27. As a result, the discharge check valve unit 22 and the plunger 5
A pump chamber 7 is defined within the sliding hole 27 between the two. Further, an outer flange portion 28 is integrally provided at the end of the plunger 5 on the rotating chamber 12 side, and a spring 29 surrounding the small cylindrical portion 26 of the plunger 5 and the sleeve 21 is connected to the end surface of the cylindrical portion 25 and the outer flange portion 28 . It is interposed between the flange portion 28 and the flange portion 28 . As a result, the plunger 5 is elastically biased in the direction of sliding contact with the outer circumferential surface of the cam 12, that is, the ball bearing 14, and the plunger 5 moves into the sliding hole 27 in accordance with the rotation of the drive shaft 4, that is, the cam 12.
The volume of the pump chamber 7 changes as it slides back and forth within the pump chamber 7.

In FIG. 3, the discharge check valve unit 22
includes a unit main body 30, a spherical valve body 31, and a conical coil spring 33 for biasing the valve body 31 toward a valve seat 32.

The unit main body 30 is constructed by interconnecting a bottomed cylindrical body 34, a cylindrical body 35, and a bolt 36 with pins 37 and 38. The bottomed cylindrical body 34 has the hole 1
The diameter is small enough to form an annular flow path 39 between the inner surface of the tube and the inner surface of the tube. A fitting protrusion 40 that projects integrally with the cylindrical body 35 is fitted into the bottomed cylindrical body 34, thereby forming a valve chamber 41. Moreover, the fitting protrusion 40 between the bottomed cylindrical body 34 and the cylindrical body 35
A pin 37 is inserted through, thereby integrally connecting the two. Further, an O-ring 42 for sealing the annular flow path 39 is interposed between the outer peripheral surface of the cylindrical body 35 and the inner surface of the hole 16. moreover,
A fitting recess 43 is provided on the opposite side of the cylindrical body 35 from the fitting protrusion 40 .
A protrusion 44 integral with the bolt 36 is inserted into the bolt 36,
The protrusion 44 and the cylindrical body 35 are integrally connected by a pin 38. In this way, the unit main body 30 is constructed.

On the other hand, at the end of the sleeve 21 facing the discharge check valve 8 side, a tapered surface 45 that widens toward the discharge check valve 8 side is provided in series with the sliding hole 27. No. 30 of the bottomed cylindrical body 34 is provided with a conical surface 46 facing the tapered surface 45 and having an angle β smaller than the angle α of the tapered surface 45. A valve hole 47 concentric with the sliding hole 27 is bored at the closed end of the bottomed cylindrical body 34.
A valve seat 32 is formed at an opening facing the valve chamber 41 . Further, in the valve chamber 41, a conical coil spring 33 is interposed between the valve body 31 and the fitting protrusion 40, and the spring force of the conical coil spring 33 causes the valve body 31 to be directed toward the valve seat 32. energized. Valve chamber 4
1 communicates with the annular flow path 39 via a communication hole 48 formed in the bottomed cylindrical body 34.

In such a discharge check valve unit 8, the bolt 36 is screwed into the female threaded portion 18 to form the hole 16.
A seal member 49 is inserted between the stepped surface 17 and the bolt 36. Furthermore, since the angle β of the conical surface 46 is smaller than the angle α of the tapered surface 45, as the discharge check valve unit 22 is screwed in, the conical surface 46 bites into the tapered surface 45, thereby causing the pump chamber 7 to Annular channel 39
The function of sealing between the

Referring again to FIG. 2, the suction check valve 6 is constructed by fitting a suction check valve unit 51 into a fitting hole 50 formed in the main body 2. The fitting hole 50 has, in order from the bottom toward the open end, a small diameter portion 52, a first large diameter portion 54 connected to the small diameter portion 52 via a stepped surface 53, and the first large diameter portion 54.
The second large diameter portion 57 is provided with a female threaded portion 55 that is continuous with the female threaded portion 55 and a second large diameter portion 57 that is continuous with the female threaded portion 55 via a stepped surface 56.

Referring to FIGS. 4 and 5 together, the suction check valve unit 51 basically includes a cylindrical unit body 58, a spherical valve body 59, and the valve body 59 directed toward the valve seat 60. Conical coil spring 6 for biasing
1, a retainer 62 for holding the conical coil spring 61, and a retainer 62 that is pressed against the stepped surface 53 of the fitting hole 50 to perform a sealing function.
It also includes a ring-shaped metal gasket 63 that also functions to support the unit body 58.

The unit main body 58 includes a fitting portion 64 that is fitted into the first large diameter portion 54 and a male threaded portion 65 that is connected to the fitting portion 64 and screwed into the female threaded portion 55 .
Also, an end surface 66 opposite to the step surface 53 of the fitting portion 64
A cylindrical protrusion 67 is concentrically protruded on the
A valve seat 60 for receiving the valve body 59 is formed at the tip of the protrusion 67 . A valve hole 68 formed in the valve seat 60 is connected to a flow path 69 formed in the unit body 58. Further, a groove 71 for forming an annular flow path 70 between it and the inner surface of the first large diameter portion 54 is formed on the outer circumferential surface of the fitting portion 64, and the flow path 69 is a groove. 71 or annular channel 70
communicate with. A suction flow path 72 as an inlet communicating with a suction pipe (not shown) is opened in this annular flow path 70, and the rotation chamber 12 communicates with it via a communication hole 73. Therefore, the rotating chamber 12 is also filled with oil, thereby achieving a lubricating effect on the sliding contact portion between the cam 13 and the plunger 5, etc. In order to prevent the oil in the rotation chamber 12 from leaking to the gear reducer 3 side, a seal member 74 is slidably connected to the drive shaft 4 as shown in FIG. 2.
Further, in order to seal between the annular flow path 70 and the outside, an O-ring 75 is interposed between the second large diameter portion 57 of the fitting hole 50 and the unit body 58.

The retainer 62 is made of a thin metal plate, and includes a disk-shaped base 77 with a through hole 76 in the center, and the base 77.
The leg portion 78a, 78b, and 78c extend in one axial direction of the base portion 77 from a plurality of, for example, three, peripheral edge portions spaced apart in the circumferential direction of the base portion 77. Each leg 78a, 78b, 78c is curved into an arc shape corresponding to the outer circumferential surface of the protrusion 67 on the unit main body 58, and can be brought into close contact with the outer circumferential surface of the protrusion 67. Moreover, each leg portion 78a, 78b,
78c has such elasticity that its free ends can move toward and away from each other.

An engagement groove 79 is formed on the outer peripheral surface of the protrusion 67 in the unit main body 58 over the entire circumference.
Engagement protrusions 80 are formed on the inner surfaces of the retainer 62 near the free ends of the legs 78a, 78b, 78c in correspondence with the engagement grooves 79, respectively. Moreover, these engaging protrusions 80 are arranged on each leg portion 78a, 7 so as to be inclined inwardly toward the base portion 77.
It is formed by punching out 8b and 78c.

The conical coil spring 61 is interposed between the valve body 59 with its large diameter end in contact with the base 77 of the retainer 62, and the valve body 59 is fitted into the small diameter end of the conical coil spring 61 to form a valve seat. 60.

When assembling the suction check valve unit 51,
With the valve body 59 placed on the valve seat 60, the conical coil spring 61 is inserted into the retainer 62, and while the free ends of the legs 78a, 78b, 78c of the retainer 62 are expanded, the unit main body 58 into the protrusion 67. Next, the gasket 63 is pushed in from the outside of the retainer 62 to seal each leg 78 of the retainer 62.
a, 78b, and 78c are sandwiched and supported between the protrusion 67 and the protrusion 67. In this way, with the suction check valve unit 51 assembled by integrally supporting the valve body 59, conical coil spring 61, and retainer 62 on the unit body 58 with the gasket 63, the unit body 58 is inserted into the fitting hole 50. Screw into. As a result, gasket 6
3 is pinched between the stepped surface 53 and the end surface 66 of the unit main body 58 to perform a sealing function, thereby forming the suction check valve 6.

A passage 81 communicating with the bottom of the fitting hole 50 is connected to the main body 2.
This passage 81 is drilled in the O-ring 2.
3 and 24 communicate with the pump chamber 7 through a through hole 82 formed in the side wall of the sleeve 21.

Referring again to FIG. 1, the main body 2 includes an annular channel 39.
A fluid passage 83 is bored therein, and the open end of this fluid passage 83 is connected to a bleeder plug 84.
It is blocked by In addition, a bottomed hole 85 is formed in the main body 2 so as to intersect with the middle of the fluid passage 83, and the opening end is inclined upward. , a filter device 9 is constructed.

The filter 86 basically has a cylindrical shape with a bottom,
A synthetic resin support member 88 is provided with windows 87 at intervals in the circumferential direction on its side wall, and a synthetic resin net member 8 is stretched over each window 87 of the support member 88.
9 and a magnet 90 fixed to the bottom of the support member 88. A large diameter portion 91 that can be press-fitted into the bottomed hole 85 is provided on the open end side of the support member 88, so that when the filter 86 is inserted into the bottomed hole 85, the outer surface of the filter 86 and the diameter portion 91 are large enough to be press-fitted into the bottomed hole 85. bottom hole 85
An annular chamber 92 is defined between the inner surface and the inner surface of the annular chamber 92 . Moreover, the fluid passage 83 is opened at the side surface of the bottomed hole 85 facing the annular chamber 92 .

The member near the open end of the bottomed hole 85 has a female threaded portion 9.
3 is provided, and a bolt 95 having a fluid passage 94 communicating with the inside of the filter 86 is screwed into this female threaded portion 93 . This bolt 95 can come into contact with the open end surface of the support member 88, and by screwing the bolt 95, the large diameter portion 91 of the support member 88
is forcibly press-fitted into the bottomed hole 85, thereby achieving a seal between the annular chamber 92 and the outside. Moreover, the filter 86 is arranged in the bottomed hole 85 so that a foreign matter storage section 96 can be defined between the filter 86 and the bottom surface of the bottomed hole 85.
The closed end of the support member 88 is inserted into the bottomed hole 85 due to the excessive screwing amount of the bolt 95.
The length of the filter 86 is determined so as to avoid contact with the bottom surface of the filter 86.

A connecting portion 98 surrounding the bolt 95 is sandwiched between the head 97 of the bolt 95 and the main body 2 with seal members 99 and 100 arranged on both sides thereof. A discharge pipe 10 is integrally provided in this connecting portion 98, and a fluid passage 83 inside the bolt 95 is connected to the connecting portion 98.
It is communicated with the discharge pipe 10 via 8.

Next, to explain the operation of this embodiment, when the plunger 5 is displaced toward the rotating chamber 12 side with the rotational movement of the cam 13, the volume of the pump chamber 7 increases, and the suction check valve 6 has a valve body. 59 resists the spring force of the conical coil spring 61 and separates from the valve seat 60 to open the valve.
It is sucked into the air, sits down, and closes the valve. Therefore, the hydraulic oil sucked from the suction passage 72 flows through the suction check valve 6.
It flows into the pump chamber 7 through the. Next, when the plunger 5 is displaced and driven toward the pump chamber 7,
The suction check valve 6 is closed, and the discharge check valve 8 is opened. Therefore, the hydraulic oil in the pump chamber 7 is discharged into the fluid passage 83 via the discharge check valve 8. By repeating this operation, the suction passage 7
Hydraulic oil sucked from 2 is continuously discharged into fluid passage 83.

The hydraulic fluid discharged into the fluid passage 83 passes through the filter device 9 and is discharged from the discharge pipe 10. Therefore, dirt and foreign matter mixed into the hydraulic oil are filtered out by the filter device 9. In addition, the fluid passage 83 is opened facing the side of the filter 86, and a foreign matter storage section 96 is provided below the filter 86, so that dust and foreign matter whose circulation is blocked by the surface of the net member 89 can be removed. , the foreign matter sinks inside the annular chamber 92 and is stored in the foreign matter storage section 96 . In particular, if iron powder is mixed in the hydraulic fluid, it will be attracted by the magnet 90 and sink into the foreign matter storage section 96. Therefore, dust and foreign matter do not stick to the surface of the filter 86 forever, and clogging of the filter 86 is prevented as much as possible, and as a result, an increase in flow resistance is suppressed for a relatively long period of time.

C. Effects of the invention As described above, according to the invention, a bottomed hole is bored in the main body with the opening end facing upward, and the bottomed hole is closed at one end and has an opening at the other end. A cylindrical filter that communicates with the downstream fluid passage is fitted so as to form an annular chamber between the inner surface of the bottomed hole and a foreign matter storage section between the one end and the bottom of the bottomed hole. A magnet is disposed in the filter in a portion close to the foreign matter storage portion, and the upstream fluid passage faces the annular chamber and opens on the side of the bottomed hole, so that dust and foreign matter filtered by the filter are prevented. The foreign matter sinks in the annular chamber and is collected in the foreign matter storage section, and in the case of iron powder in particular, it is attracted by the magnet and is effectively stored in the foreign matter storage section. Therefore, clogging due to adhesion of dust and foreign matter to the surface of the filter is prevented as much as possible, and an increase in flow resistance due to clogging is suppressed for a relatively long period of time.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a vertical cross-sectional view of a hydraulic pump incorporating the device of the present invention, and is a cross-sectional view taken along the - line in FIG. 2, and FIG. 3 is an enlarged longitudinal sectional view of the discharge check valve, FIG. 4 is an enlarged longitudinal sectional view of the suction check valve, and FIG. 5 is an enlarged perspective view of the suction check valve unit. It is. 2... Main body, 9... Filter device, 83, 94
... Fluid passage, 85 ... Bottom hole, 86 ... Filter, 90 ... Magnet, 92 ... Annular chamber, 96
...Foreign material storage section.

Claims (1)

[Scope of utility model registration request] A bottomed hole is formed in the main body and is inclined with the opening end upward, and a cylindrical filter whose one end is closed and whose opening at the other end communicates with the downstream fluid passage is inserted into the bottomed hole. The filter is fitted so as to form an annular chamber with the inner surface of the bottom hole and to form a foreign matter storage section between the one end and the bottom of the bottom hole, and the filter is fitted in a portion close to the foreign matter storage section. A filter device characterized in that a magnet is disposed, and the upstream fluid passage is opened at a side surface of the bottomed hole facing the annular chamber.