JP4074361B2 - Relief valve for lubrication pump - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a relief valve for a lubrication pump, which is provided in a lubrication pump that supplies lubrication oil in an oil reservoir to a lubrication system and sets a discharge pressure of the lubrication pump.
[0002]
[Prior art]
In general, for example, a lubrication pump as shown in FIG. 5 is known. This lubrication pump is, for example, a pump unit 3 such as a gear pump that is accommodated in a reservoir tank (not shown) in a lower opening 2 of a metal pump body 1 and that sucks and discharges oil in the reservoir tank by being rotated. The pump unit 3 is rotated and driven by a main shaft 4 connected to an electric motor (not shown) so that oil is discharged from the pump unit 3 to an oil passage 5 provided in the pump body 1. Reference numeral 6 denotes a suction filter provided in the opening 2, and 7 denotes a filter holder.
In such a lubrication pump, a relief valve 10 is generally provided to set the discharge pressure.
[0003]
Conventionally, as shown in FIG. 5, the relief valve 10 is provided in communication with an oil passage 5 through which oil passes, and has an inlet opening 11 facing the oil passage 5 and an outlet opening 12 facing the reservoir tank. A valve body 13 provided integrally with the pump body 1 and a ball-shaped check valve body 14 provided in the valve body 13 so as to be movable with a clearance between the inner surface of the valve body 13 and closing the inlet opening 11. A coil spring 15 for urging the check valve body 14 in a direction to close the inlet opening 11; 16 when the check valve element 14 is pushed by the oil pressure in the oil passage 5 against the urging force of the coil spring 15. And it is separated from the opening 11, so that escape of oil from the oil passage 5 from the outlet opening 12.
[0004]
By the way, in general, if air is mixed in the discharged oil, it may cause troubles such as malfunction of a valve provided at the oil supply point or fluctuation in the oil supply amount in the lubrication system. Therefore, an air bleeding mechanism may be provided in the lubrication pump.
Conventionally, as shown in FIG. 6, this air vent mechanism 20 is incorporated in the pump body 1, for example, and has an inlet 21 facing the oil passage 5 and an outlet 22 facing the reservoir tank, and is integrated with the pump body 1. A valve main body 23 to be molded, a ball-shaped valve body 24 which is provided movably with a clearance between the inner surface of the valve main body 23 and the outlet 22 can be closed by movement; A spring 25 that urges the body 24 in a direction to close the inlet side and enables the outlet 22 to be closed by the valve stop 24 when the valve stop 24 moves a required amount against the biasing force; A holding member 26 that holds the spring 25 is provided, and air in the oil passage 5 is allowed to escape from the inlet 21 to the outlet 22 by the clearance between the valve main body 23 and the valve body 24.
[0005]
[Problems to be solved by the invention]
By the way, in this conventional lubrication pump, since the air bleeding mechanism 20 is incorporated in the pump main body 1, the structure is complicated, the number of parts is increased, the number of manufacturing steps is increased, and the manufacturing is complicated. was there.
The present invention has been made in view of such problems, simplifying the structure of the pump so that air can be vented without separately providing an air venting mechanism in the pump body, reducing the number of parts, It is intended to facilitate manufacture.
[0006]
[Means for Solving the Problems]
The technical means of the present invention for solving such a problem is provided in communication with an oil passage through which oil from a pump section that sucks and discharges lubricating oil in the reservoir tank passes, and is provided in the oil passage. A cylindrical valve body having an inlet opening facing and an outlet opening facing the reservoir tank, and a movably provided inside the valve body with a clearance between the inner surface of the valve body and closing the inlet opening A check valve body and a spring for urging the check valve body in a direction to close the inlet opening, and when the check valve body is pushed by the oil pressure in the oil passage against the urging force of the spring, In a relief valve for a lubrication pump in which a check valve body is separated from an inlet opening and oil from the oil passage is released to an outlet opening, the check valve body is placed in the oil passage. Between the inner surface of the valve body and the inner surface of the valve body, and a clearance for allowing air in the oil passage to escape from the inlet to the outlet. A stop body capable of closing the outlet by the movement, and urging the stop body toward the inlet side and moving the required stop body against the urging force. by constituted by a spring that allows to close the outlet, with the spring and the spring so that the valve body can begin movement of the check valve body when closes the outlet The power is set.
Thereby, since the check valve body has an air bleeding function, that is, the air bleeding mechanism is integrated, the pump can be easily manufactured and the number of parts can be reduced as compared with the case where it is provided separately.
[0007]
If necessary, the valve body has a tapered inclined outer peripheral surface whose outer side on one end side can come into contact with the inlet opening edge of the check valve body. The inclined surface ensures contact and improves sealing performance.
Further, if necessary, the valve body is configured to have a cylindrical body having a small hole as an inlet on one end side and an open hole on the other end side, and the cylindrical body is configured by the spring. A retainer having a through passage that is in contact with the biased stop valve body and communicates with the clearance is press-fitted.
Since the stop valve body abuts on this separately press-fitted retainer, the stop valve body does not block the inlet, and the through passage communicates with the clearance, so that air is surely released from the inlet to the outlet.
[0008]
Furthermore, if necessary, the valve body is made of a ball, the spring is made of a coil spring, and the valve body is press-fitted into an open hole at the other end of the cylindrical body to provide a holding member for holding the spring. The holding member is formed with a through hole coaxial with the cylindrical body, and the through hole is formed as the outlet. The holding member is inserted into a coil spring on the valve body side, and the valve body is the outlet. A shaft portion coaxial with the cylindrical body that forms a space between the cylindrical body and the cylindrical body is formed so that the coil spring can be reduced when the coil is closed.
Thereby, since an exit is formed in the holding member separately press-fitted, the processing accuracy of the exit can be improved, and therefore the sealing performance with the stop valve body is improved.
[0009]
Furthermore, if necessary, a female screw is formed on the valve body, a male screw is formed to be screwed to the female screw, and a pressing member is provided to press the spring so that the urging force of the spring can be moved forward and backward. A through hole communicating with the outlet opening is formed in the holding member, a small female screw portion having an axis perpendicular to the axis of the female screw is formed in the valve body, and a small screw that is screwed into the small female screw portion A lock member is provided which has a male screw portion and fixes the presser member at an appropriate forward / backward position of the presser member by screwing into the small female screw portion.
As a result, the biasing force of the spring is easily adjusted and the discharge pressure of the pump can be easily set, and can be fixed by the lock member, so that a situation in which the set pressure changes due to movement during operation of the pump is prevented.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a relief valve for a lubrication pump according to an embodiment of the present invention will be described with reference to the accompanying drawings.
1 to 4 show a relief valve R for a lubrication pump according to an embodiment, and this relief valve R is used in, for example, the lubrication pump shown in FIG.
In the lubrication pump shown in FIG. 4, 30 is a resin reservoir tank for storing lubricating oil, 31 is a lid for closing the open portion of the reservoir tank 30, and 32 is a pump body attached to the lid 31. The suction body 33 provided on the side and the drive part mounting body 34 provided on the upper side of the lid 31 are integrally formed of resin.
The suction body 33 is provided with a pump portion 3 similar to the above, which comprises a gear pump that is attached to an opening 34 provided on the lower side and rotates and sucks and discharges oil in the reservoir tank 30. The suction body 33 is formed with an oil passage 5 similar to the above through which oil discharged from the pump unit 3 passes. An outlet 5a of the oil passage 5 is connected to a connection coupling 35 provided on the lid 31 by a pipe 36 so that oil can be supplied from the connection coupling 35 to the lubrication system. Similarly to the above, 6 is a suction filter provided in the opening 34, and 7 is a filter holder.
[0011]
Reference numeral 37 denotes a depressurizing nozzle for making the pressure on the lubrication system side zero when the pump unit 3 is stopped. The depressurizing passage 38 communicates with the oil passage 5, and the depressurizing passage when oil is discharged from the pump unit 3. 38 is provided with a valve body 39 that closes 38 and opens the decompression passage when stopped.
Further, the suction body 33 houses a pressure switch 40 that detects the oil pressure in the oil passage 5. The pressure switch 40 includes a piston 41 that is inserted into the oil passage 5 and can be moved by hydraulic pressure, and a detection unit 42 that detects the movement of the piston 41 and detects that the hydraulic pressure has reached a predetermined value. Yes.
Reference numeral 43 denotes an oil supply opening provided on the lid 31 for supplying oil into the reservoir tank 30.
An electric motor 44 is provided in the drive unit mounting body 34, and the pump unit 3 is rotated and driven by a main shaft 45 connected to the electric motor 44. A cover 46 is attached to the drive unit attachment body 34 and covers the electric motor 44.
[0012]
The lubrication pump relief valve R according to the embodiment is provided in communication with the oil passage 5 of the pump body 32.
As shown in FIG. 1, in the relief valve R, 50 is a cylindrical valve body having an inlet opening 51 facing the oil passage 5 and an outlet opening 52 facing the reservoir tank 30. The inlet opening 51 has an outer small diameter part 51a and an inner large diameter part 51b, and the inner opening edge of the large diameter part 51b forms a circular edge 51c. The valve body 50 is provided in the pump body 32 by insert molding when the pump body 32 is molded.
A check valve body 60, which will be described in detail later, is provided in the valve body 50 so as to be movable with a clearance from the inner surface of the valve body 50, and closes the inlet opening 51.
[0013]
A coil spring 53 biases the check valve body 60 in a direction to close the inlet opening 51. The valve main body 50 is formed with a female screw 50a, and a male screw 54a that is screwed into the female screw 50a is formed, and a pressing member 54 that presses the coil spring 53 so that the biasing force of the coil spring 53 can be moved forward and backward is variable. Is provided. A through hole 55 is formed in the pressing member 54, and the through hole 55 communicates with the outlet opening 52.
The valve body 50 is formed with a small female screw portion 50b having an axis perpendicular to the axis of the female screw 50a. The small female screw portion 50b has a small male screw portion 56a that is screwed into the small female screw portion 50b, and the presser member 54 is fixed at an appropriate forward / backward position of the presser member 54 by being screwed into the small female screw portion 50b. A lock member 56 is screwed.
Thereby, when the check valve body 60 is pushed by the oil pressure of the oil passage 5 against the biasing force of the coil spring 53, the check valve body 60 is separated from the inlet opening 51 and the relief valve R is separated from the oil passage. 5 is allowed to escape to the outlet opening 52.
[0014]
Next, the check valve body 60 will be described in detail. The structure of the check valve body 60 is that the oil passage 5 is provided between a cylindrical valve body 63 having an inlet 61 facing the oil passage 5 and an outlet 62 facing the valve body 50 and the inner surface of the valve body 63. A valve stop body 64 made of a resin or metal ball provided with a clearance S for allowing air to escape from the inlet 61 to the outlet 62 and capable of closing the outlet 62 by the movement, and a valve stop body 64. A coil spring 65 that biases the inlet 61 side and allows the valve body 64 to close the outlet 62 when a required amount of the valve body 64 moves against the biasing force. The movement of the check valve body 60 can be started when the outlet 62 is closed.
[0015]
Specifically, the valve body 63 is press-fitted into a cylindrical body 68 having a small hole as an inlet 61 on one end side and an open hole 67 on the other end side, and an open hole 67 on the other end of the cylindrical body 68. And a holding member 70 that holds the coil spring 65. Further, the cylindrical body 68 of the valve body 63 has a tapered inclined outer peripheral surface 68a whose outer side on one end side can come into contact with the edge 51c of the inlet opening 51 of the check valve body 60. As shown in FIG. 3, the cylindrical body 68 is press-fitted with a retainer 71 having a through-passage 71 a that is in contact with the valve stop 64 that is biased by the coil spring 65 and communicates with the clearance S. The retainer 71 is formed in a disc shape, and the through passage 71a is formed by notches on the left and right in the axial direction.
A through hole coaxial with the cylindrical body 68 is formed in the holding member 70, and this through hole is configured as the outlet 62. Further, a space C is formed between the holding member 70 and the cylindrical body 68 so that the coil spring 65 is inserted on the valve stop body 64 side and the coil spring 65 can be reduced when the valve stop body 64 closes the outlet 62. A shaft portion 72 coaxial with the cylindrical body 68 is formed. Reference numeral 73 denotes a shaft portion formed on the side of the coil spring 53 of the holding member 70 and coaxial with the cylindrical body 68 into which the coil spring 53 is inserted.
The biasing force of the coil spring 53 and the coil spring 65 causes the air in the oil passage 5 to escape from the inlet 61 to the outlet 62, and the check valve body 60 starts moving when the valve stop body 64 blocks the outlet 62. The strength is set to be possible.
[0016]
Therefore, when the relief valve R for a lubrication pump according to this embodiment is assembled, as shown in FIG. 4, when the pump body 32 is integrally molded with a mold, the cylindrical valve body 50 is inserted simultaneously. Mold. Thereafter, the check valve body 60 assembled in advance is inserted into the valve body 50, the coil spring 53 is inserted, and the holding member 54 is screwed into the female screw 50a of the valve body 50.
In this case, since the check valve body 60 having an air bleeding function is provided in the relief valve R, the structure of the pump is simplified as compared with the case where a separate air bleeding mechanism is provided in the conventional pump body 32. The number of parts is reduced, and manufacturing is extremely easy.
When the pump is shipped, the presser member 54 is screwed and positioned at an appropriate forward / backward position so as to have a predetermined discharge pressure, and the lock member 56 is screwed to lock the presser member 54. In this case, the biasing force of the coil spring 53 is adjusted by adjusting the screwing of the presser member 54, and the discharge pressure of the pump is easily set and can be fixed by the lock member 56. Therefore, the presser member 54 can be fixed during operation of the pump. The situation where the set pressure changes due to movement is prevented.
[0017]
The lubrication pump relief valve R assembled in this way operates as follows. First, as shown in FIG. 1, in the stationary state, the check valve body 60 is pushed by the biasing force of the coil spring 53, and the valve body 63 of the check valve body 60 is brought into the edge 51 c of the inlet opening 51 of the valve body 50. The inclined outer peripheral surface 68a of the cylindrical body 68 in FIG. 1 abuts on the edge 51c of the inlet opening 51 of the valve body 50 and closes the inlet opening 51. In this case, since it is the inclined outer peripheral surface 68a, the contact is ensured, the sealing property is good, and unnecessary oil leakage is prevented.
Further, in the check valve body 60, the valve stop body 64 is pressed by the urging force of the coil spring 65 and abuts against a retainer 71 that is separately press-fitted into the valve body 63.
[0018]
Next, when the pump unit 3 is driven by the operation of the electric motor 44, oil is sucked by the pump unit 3 and discharged to the oil passage 5. At this time, air in the oil or air existing in the filter 6 or the pump unit 3 is about to flow, but the through-passage 71a of the retainer 71 communicates with the clearance S as shown in FIG. Therefore, in the state where the check valve body 60 closes the inlet opening 51, the air in the oil passage 5 exits from the inlet 61 to the outlet 62 and escapes from the outlet opening 52. For this reason, in the lubrication system, the cause of troubles such as malfunction of a valve provided at the oil supply point or fluctuation in the oil supply amount is eliminated.
In this case, since the valve stop 64 is in contact with the retainer 71 and the valve stop 64 does not block the inlet 61, air is surely released from the inlet to the outlet.
[0019]
Thereafter, when the air is discharged, the pressure in the oil passage 5 gradually increases, and as shown in FIG. 2B, first, the check valve body 60 closes the inlet opening 51, and then the valve stop body. 64 moves against the biasing force of the coil spring 65 and closes the outlet 62. Thereby, there is no oil leakage and the pressure in the oil passage 5 can be increased (at the time of initial pressurization).
Further, when the pressure of the oil passage 5 increases due to the discharge of the oil and reaches a predetermined value, the check valve body 60 is moved by the biasing force of the coil spring 53 as shown in FIG. It enters from the inlet opening 51 and escapes from the outlet opening 52, and the discharge pressure is kept constant.
In this case, since the outlet 62 is formed in the holding member 70 that is separately press-fitted, the processing accuracy of the outlet 62 can be improved, and therefore the sealing performance with the valve stop 64 can be improved, and unnecessary oil can be obtained. Leakage is prevented. Further, when the valve stop 64 closes the outlet 62, the coil spring 65 can enter the space C between the shaft portion 72 and the valve body 63, so that the valve 62 can reliably close the outlet 62. The valve body 60 is reliably moved. Further, since the coil spring 65 is inserted into the shaft portion 72, the holding is ensured, and the valve stop body 64 and the coil spring 65 are smoothly moved.
[0020]
In the above embodiment, the valve main body 50 is attached to the pump main body 32 by insert molding. However, the valve main body 50 is not necessarily limited to this, and may be configured to be attached by a screw mechanism or the like. It doesn't matter.
[0021]
【The invention's effect】
As described above, according to the relief valve for a lubrication pump of the present invention, the check valve body has an air venting function, that is, the air venting mechanism is integrated, so that compared to the case where it is provided separately conventionally. The structure of the pump can be simplified and the manufacturing can be performed very easily. Further, the number of parts is reduced, management becomes easier, and the cost can be reduced accordingly. Further, since the passage through which air escapes and the passage through which oil escapes are shared, air can be easily escaped, and air can be reliably discharged.
[0022]
And when the valve body of the check valve body is configured to have a tapered inclined outer peripheral surface that can be brought into contact with the inlet opening edge of the check valve body on the outer side of the check valve body, the contact is made because it is an inclined surface. It can be performed reliably, has a good sealing property, and can prevent unnecessary oil leakage.
Further, the valve body has a cylindrical body having a small hole as an inlet on one end side and an open hole on the other end side, and the valve body is biased by a spring to the cylindrical body. When a retainer that has a through passage communicating with the clearance is press-fitted, the valve stop contacts the retainer that is separately press-fitted, so that the stop does not block the inlet and the through passage becomes the clearance. Since it communicates, air can be surely escaped from the entrance to the exit.
[0023]
Furthermore, the valve stop is composed of a ball, the spring is composed of a coil spring, and the valve body is configured by providing a retaining member that is press-fitted into the open hole at the other end of the cylindrical body to hold the spring, and the retaining member is cylindrical. A cylindrical body is formed so that a through hole coaxial with the body is formed and the through hole is configured as an outlet, and the coil spring is inserted into the holding member on the side of the valve body and is closed when the valve body closes the outlet. When the shaft portion coaxial with the cylindrical body forming the space is formed, the valve stop body is constituted by a ball, so that it can be easily obtained, the cost can be reduced, and separately press-fitted Since the outlet is formed in the member, the processing accuracy of the outlet can be improved, so that the sealing performance with the stop valve body can be improved, and unnecessary oil leakage can be prevented. In addition, the coil spring can enter the space between the shaft and the valve body when the valve body closes the outlet, so that the outlet can be reliably closed with the valve body, and the check valve body can be moved reliably. Can be made. Further, since the coil spring is inserted into the shaft portion, the holding is ensured, and the ball and the spring can be moved smoothly.
[0024]
Furthermore, a female screw is formed on the valve body, a male screw is formed to be screwed into the female screw, and a pressing member is provided to press the spring so that the biasing force of the spring can be moved forward and backward. A through hole is formed in the pressing member. The through hole is formed as an outlet opening, a small female screw portion having an axis perpendicular to the axis of the female screw is formed in the valve body, and a small male screw portion that is screwed into the small female screw portion is formed. When a lock member is provided that fixes the presser member at an appropriate forward / backward position by screwing it into the small female thread, the pump's discharge pressure can be easily adjusted by adjusting the spring biasing force, Since it can be fixed by a member, it is possible to prevent a situation in which the set pressure changes due to movement during operation of the pump.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a relief valve for a lubrication pump according to an embodiment of the present invention.
FIGS. 2A and 2B are views showing an operation state of the relief valve for a lubrication pump according to the embodiment of the present invention, wherein FIG. 2A is a cross-sectional view showing an air bleeding state, and FIG. (C) is sectional drawing which shows the relief state of oil.
FIG. 3 is a perspective view showing a retainer of a relief valve for a lubrication pump according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view showing an example of a lubrication pump using a relief valve for a lubrication pump according to an embodiment of the present invention.
FIG. 5 is a partial cross-sectional view showing a relief valve for a conventional lubrication pump together with an example of a lubrication pump using the same.
6 is a cross-sectional view taken along line AA in FIG. 4 showing an air bleeding mechanism in a conventional lubrication pump.
[Explanation of symbols]
R Relief valve for lubrication pump 3 Pump section 5 Oil passage 30 Reservoir tank 32 Pump body 33 Suction body 34 Drive section mounting body 37 Decompression nozzle 40 Pressure switch 44 Electric motor 45 Main shaft 46 Cover 50 Valve body 51 Inlet opening 51c Edge 52 Outlet Opening 53 Coil spring 54 Presser member 55 Through hole 56 Lock member 60 Check valve body 61 Inlet 62 Outlet 63 Valve body 64 Stopper body 65 Coil spring 67 Open hole 68 Cylindrical body 70 Holding member 71 Retainer 71a Through path 72 Shaft

Claims (4)

A cylindrical shape having an inlet opening facing the oil passage and an outlet opening facing the reservoir tank is provided in communication with an oil passage through which oil from a pump section that sucks and discharges lubricating oil in the reservoir tank passes. A check valve body that is provided movably with a clearance between the valve main body and the inner surface of the valve main body, and that closes the inlet opening, and that the check valve body closes the inlet opening. An urging spring, and when the check valve body is pushed by the oil pressure of the oil passage against the urging force of the spring, the check valve body is separated from the inlet opening, and the oil from the oil passage In relief valve for lubrication pump that escapes to the outlet opening,
The check valve body is formed between a cylindrical valve body having an inlet facing the oil passage and an outlet facing the valve body, and air in the oil passage is formed between the inner surface of the valve body and the inlet to the outlet. A valve body that is movably provided with clearance to escape, and that can close the outlet by the movement, and that the valve body is urged toward the inlet side and the valve body is resisted against the urging force. And a spring that allows the outlet to be closed by the stop body when the required amount moves, so that the check valve body can start to move when the stop body closes the outlet. so as to set the urging force of the spring and the spring,
The valve body comprises a cylindrical body having a small hole as an inlet on one end side and an open hole on the other end side, and a stop valve urged by the spring to the cylindrical body A relief valve for a lubrication pump , wherein a retainer having a through-passage that is in contact with a body and communicates with the clearance is press-fitted .   2. The relief valve for a lubrication pump according to claim 1, wherein the valve body has a tapered inclined outer peripheral surface whose outer side on one end side can come into contact with the inlet opening edge of the check valve body. The valve body is constituted by a ball, the spring is constituted by a coil spring, and the valve body is provided with a holding member that is press-fitted into an open hole at the other end of the cylindrical body to hold the spring, and the holding member A through hole coaxial with the cylindrical body is formed as the outlet, and the coil spring is inserted into the holding member through a coil spring on the valve body side and the valve body closes the outlet. 3. The relief valve for a lubrication pump according to claim 1, wherein a shaft portion coaxial with the cylindrical body that forms a space between the cylindrical body and the cylindrical body is formed so that the space can be reduced. A female screw is formed on the valve body, a male screw is formed to be screwed into the female screw, and a pressing member is provided to press the spring so that the urging force of the spring can be moved forward and backward. A small female screw portion having an axis perpendicular to the axis of the female screw is formed in the valve body, and a small male screw portion that is screwed into the small female screw portion is provided. 4. The relief valve for a lubrication pump according to claim 1 , further comprising a lock member for fixing the presser member at an appropriate advance / retreat position of the presser member by being screwed into the small female screw portion.

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