JP2861491B2 - Centralized lubrication system distribution valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution valve for a centralized lubrication system for measuring a lubricating oil and distributing a fixed amount of the lubricating oil to lubricating points of a machine tool or the like.

[0002]

2. Description of the Related Art Conventionally, a distribution valve of this type of centralized lubrication device has
For example, as described in U.S. Pat. No. 3,145,803 and as shown in FIG. 5, a valve body C having an oil supply path A and an oil discharge path B communicates with the oil supply path A and the oil discharge path B. A measuring piston E is provided in the cylinder hole D so as to be able to reciprocate. The piston E defines the cylinder hole D into a measuring chamber a and a rear chamber b. A valve element F is disposed on the oil supply path A side of D, and a spring G is interposed between the valve element F and the piston E. On the other hand, the oil supply path A is provided inside the valve body C. A communication passage H for the lubricating oil extending to the rear chamber b is formed.

[0003] The oil supply passage A of each distribution valve constructed as described above is connected to a main pipe communicating with a pump, and by supplying the lubricating oil to the oil supply passage A by driving the pump, the distribution valve A To feed the lubricating oil supplied to the oil supply passage A from the communication passage H to the rear chamber b of the metering piston E, and with the supply of the lubricating oil, the piston E To feed a predetermined amount of lubricant measured in the measuring chamber a from the oil discharge passage B to each lubricating point such as a machine tool. After refueling at each distribution valve is completed, the main pipe to which the refueling passage A is connected is depressurized. With this depressurization, the valve body F is moved back to connect with the refueling passage A. The communication with the passage H was cut off, and at the same time, the piston E was moved backward by the spring G, so that the lubricating oil supplied to the back chamber b was provided in the communication passage H and the valve body F. The lubricating oil is introduced into the measuring chamber a through the passage f, and the lubricating oil is measured in the measuring chamber a to prepare for the next oil supply.

However, in the distribution valve constructed as described above, a communication passage H for communicating the oil supply passage A with the rear chamber b of the piston E is formed in the valve body C at a side of the cylinder hole D vertically. In addition to forming the passage, the vertical passage is formed by forming a horizontal passage communicating with the oil supply passage A and the rear chamber b, so that the passage processing becomes very complicated, and the communication passage H is formed. Since the vertical passage and the horizontal passage to be configured need to penetrate the outer surface of the valve main body c, it is necessary to attach plugs for closing the respective penetrating portions after the passage processing, and the valve main body c When assembling the valve body F, the piston E, and the spring G, there is a problem that the assemblability is poor and the assembling is complicated, and the cost is increased as a whole.

In view of the above problems, the valve body C
An oil passage (longitudinal passage) that connects the oil supply passage A with the rear chamber b by providing an open groove extending in the length direction of the cylinder hole D and inserting a sleeve into the cylinder hole D.
And a passage block provided with a communication passage (lateral passage) for selectively communicating the oil passage with one of the oil supply passage A and the measuring chamber a by the operation of the valve body F. Japanese Patent Application No. 2-227343 proposes that the sleeve and the passage block inserted into the cylinder hole D with a lid fixed to C are pressed and fixed to the bottom of the cylinder hole D. ).

[0006]

According to the method proposed earlier, the sleeve is inserted into the valve body after the passage block is inserted into the cylinder hole. Since the valve body, the spring, and the measuring piston are assembled in a state where the sleeve is inserted into the cylinder hole, and then the cover is attached to the whole body, so that there is a problem in workability in assembling.

An object of the present invention is to improve the sleeve so that the measuring piston, the valve element and the spring can be assembled before the sleeve is inserted into the cylinder hole while maintaining the advantages of the invention proposed above. It is possible to improve the workability of assembling the parts into the cylinder hole, and also to perform the operation inspection of the valve body before assembling the cylinder into the cylinder hole.

[0008]

According to the present invention, there is provided a valve body 1 having a cylinder hole 2 in which an oil supply passage 3 and a drain oil passage 4 are opened, a measuring piston 6 which is freely movable inside the cylinder hole 2, and a valve. When the oil is supplied, the oil supply passage 3 is communicated with the rear chamber 8 of the measuring piston 6 to move the measuring piston 6 forward, and the lubricating oil in the measuring chamber 7 is drained from the oil discharging passage 4.
At the time of depressurization, the spring of the measuring piston 6 is moved back by the spring 10 so that the lubricating oil in the rear chamber 8 is measured.
In the distribution valve adapted to be supplied to the cylinder bore 2
One end in the length direction is opened, and an oil supply hole 5 communicating with the oil supply passage 3 is opened at the other end. The oil supply hole 5 can be inserted into the cylinder hole 2 and connected to each other in a butt shape. A valve unit body 13 comprising a first sleeve 11 and a second sleeve 12 and capable of housing the metering piston 6, the valve body 9 and the spring 10 therein is formed.
3, a valve unit including the measuring piston 6, the valve body 9 and the spring 10 therein is removably inserted and fixed in the cylinder hole 2, while the valve unit body 13 and the cylinder hole 2 are fixed.
An oil passage 15 extending in the longitudinal direction of the cylinder hole 2
And the oil passage 15 is inserted into the first sleeve 11 inserted into the other end side of the cylinder hole 2 by the operation of the valve body 9, one of the oil supply passage 3 and the measuring chamber 7. A communication passage 17 for selectively communicating with the cylinder bore 2 is provided.
A restricting portion 25 for restricting the movement of the measuring piston 6 to the second sleeve 12 inserted into the open side of the oil passage 15 and the oil passage 15.
Communicating with the back chamber 8 of the measuring piston 6
And at one of the sleeves 11 and 12,
An oil drain hole 21 that connects the measuring chamber 7 to the oil drain passage 4 is provided.

An insertion hole through which the valve element 9 is movably inserted into the first sleeve 11 is provided directly or indirectly through a passage block.
And a projecting portion 37 which enters the insertion hole 38 with a gap.
And the insertion hole 3 provided on the distal end side of the insertion portion 37.
It is preferably formed by a valve portion 35 which is closely fitted to the portion 8.

It is preferable that the valve portion 35 is formed separately from the spring receiving portion 36 and the protrusion portion 37 so as to be formed independently.

[0011]

The valve unit 13 is formed by the first and second sleeves 11 and 12, and the valve unit 13 is provided with the measuring piston 6, the valve 9 and the spring 10 therein. Each of the components can be incorporated into the valve main body 1 by being removably inserted into the hole 2, so that the assembling workability can be improved.
Also, before assembling to the valve body 1, the measuring piston 6, the valve 9 and the spring 10 are attached to the valve unit 13.
Before the valve body 9 is assembled to the valve body 1.
Can be performed in advance.

In the case where the valve element 9 is formed by a spring receiving portion 36, a projecting portion 37 that projects into the insertion hole 38 with a gap, and a valve portion 35 that is inserted into the insertion hole 38 closely, The passage between the oil passage 15 and the measuring chamber 7 can be formed by the gap between the rush portion 37 and the insertion hole 38,
There is no need to drill a hole in the valve body 9 to form a passage, so that the valve body can be simplified.

When the valve portion 35 is formed separately from the spring receiving portion 36 and the projecting portion 37, the valve portion 35 can be formed, for example, in a cylindrical shape, and the formation of the valve body 9 can be further simplified. In addition, since the valve portion 35 can be formed in a short shape, the movement can be smoothly performed without any difficulty.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in FIG. 1, a single cylinder hole 2 is provided in a valve body 1. In practice, a plurality of (for example, 4 to 5) cylinder holes are provided in the valve body 1. Are provided in parallel to form a plurality of distribution valves.

The valve body 1 is provided with an oil supply passage 3 communicating with an oil supply main pipe (not shown) and an oil discharge passage 4 communicating with an oil discharge pipe (not shown) to an oil supply section. The cylinder hole 2 opens one end in the longitudinal direction and opens the oil supply hole 5 communicating with the oil supply passage 3 at the other end, and opens the oil discharge passage 4 halfway in the longitudinal direction. I have. A measuring piston 6 is provided in the cylinder hole 2 so as to be able to reciprocate. Each piston 6 defines the inside of the cylinder hole 2 into a measuring chamber 7 and a rear chamber 8. 2, a valve element 9 is provided on the oil supply path 3 side.
And a spring 10 is interposed between the valve body 9 and the piston 6.

Each of the cylinder holes 2 provided in the valve body 1 configured as described above is open at the upper side in the length direction and is blind at the lower side, and the oil supply hole 5 is formed at the bottom. At the same time, a first sleeve 11 and a second sleeve 12 made of a synthetic resin molded article which can be inserted into the cylinder hole 2 and can be joined to each other in abutting manner are provided. A valve unit 13 is formed in which the measuring piston 6, the valve 9 and the spring 10 can be housed, and the measuring piston 6, the valve 9 and the spring 10 are housed in the valve unit 13. The valve unit is detachably inserted into and fixed to the cylinder hole 2, and an open groove 14 extending in the length direction of the cylinder hole 2 is formed in the first sleeve 11. Formed, than is the oil supply passage 3 by inserted and to form an oil passage 15 communicating with the rear chamber 8 of the metering piston 6 into the cylinder bore 2 of the valve unit.

In the embodiment shown in the drawings, as shown in FIG.
4 and a large-diameter portion 16 is provided at a portion where the second sleeve 12 is inserted on the open side of the cylinder hole 2,
The oil passage 15 is formed by inserting a valve unit formed by the first and second sleeves 11 and 12 into the cylinder hole 2.

The first sleeve 11 is provided with a communication passage 17 for selectively communicating the oil passage 15 with one of the oil supply passage 3 and the measuring chamber 7 by the operation of the valve body 9. An inward flange 18 is provided to form a holding portion 20 for a passage block 19 to be described later, and an oil drain hole 21 communicating with the oil drain passage 4 is provided at a middle portion in the longitudinal direction. Is provided with a step portion 22.

The second sleeve 12 has a stepped portion 2 at its lower end which engages with the stepped portion 22 of the first sleeve 11.
The O-ring 24 is interposed and connected to these steps 22 and 23 in an abutting manner, and a regulating part 25 for regulating the movement of the measuring piston 6 is provided on the upper part.
And a communication hole 26 for communicating the back chamber 18 with the oil passage 15, and a lid that forms the regulating portion 25 is provided with a displacement amount of the measuring piston 6 to adjust the oil drainage. An adjusting screw 27 for adjusting the amount of oil discharged from the passage 4, that is, the amount of oil discharged to be measured in the measuring chamber 7, is screwed.
A cap 28 covers the outside of the second sleeve 12.

The holding portion 20 of the first sleeve 11
The passage block 19 is provided with an insertion hole 29 for movably inserting the valve body 9 and a passage 30 communicating with the communication passage 17 provided in the first sleeve 11. The end member 33 is attached to the end while being held by the holding section 20.

The first and second sleeves 11, 1
The valve unit body of the second sleeve 12 is engaged with a shoulder provided on the outer side of the lid of the second sleeve 12 by locking a stopper 34 mainly composed of a C-ring, which is secured to the open side of the cylinder hole 2. The end face of the sleeve 11 and the passage block 19 are pressed against the bottom of the cylinder hole 2 to be fixed in the cylinder hole 2.

Further, the valve element 9 projects from a short cylindrical valve portion 35, a spring receiving portion 36 and an insertion hole 38 provided at the center of the inward flange 18 into an insertion hole 29 of the passage block 19 with a gap. And an intruding portion 37 which is formed.

In the embodiment shown in the figure, the valve portion 35 is formed separately from an upper valve body 39 integrally formed with the spring receiving portion 36 and the projecting portion 37. The valve portion 35 is closely inserted into each of the insertion holes 29 and 38 and is fitted.
The oil supply passage 3 communicates with the oil passage 15 via the passage 30 and the communication passage 17 or cuts off the communication, and connects the oil passage 15 to the communication passage 17, the passage 30, and the insertion hole. It communicates with the measuring chamber 7 through a gap between the piercing portion 37 and the piercing portion 37.

The spring 10 is connected to the spring receiving portion 3.
6 and the metering piston 6, and when the oil supply passage 3 is depressurized, the protrusion 3 of the upper valve body 39
7, the valve portion 35 is pressed downward.

When assembling the distribution valve constructed as described above, first, the first and second sleeves 11 and 12 are assembled.
After the metering piston 6, the valve body 9, the spring 10, and the passage block 19 are assembled into the valve unit body 13 composed of the above, the sleeves 11, 12 are joined in abutting manner to form a cartridge type valve unit. .

Then, the valve unit thus formed is inserted from the open side of the cylinder hole 2. At this time,
This is performed by matching the oil drain hole 21 with the oil drain passage 4.
After the insertion, the stopper 34 is fixed to the open side of the cylinder hole 2 to fix the valve unit to the valve body 1.

Therefore, the valve unit is assembled by inserting the valve unit into the cylinder hole 2 and fixing the stopper 34 in a state where the valve unit is formed in advance as described above. The oil passage 15 can be formed by inserting and fitting the valve unit, and a passage connecting the oil passage 15 to the oil supply passage 3 can be formed by the first sleeve 11 and the passage block 19. There is no need to make complicated passages in the body 1,
The formation of the valve body 1 can be simplified.

The open groove 14 provided in the first sleeve 11 may be provided in the cylinder hole 2. However, when the first sleeve 11 is formed of a synthetic resin molded product, the open groove 14 is formed by molding. Can be formed more easily,
It is preferable that the cylinder hole 2 is provided on the first sleeve 11 because it can be easily formed.

Next, the operation of the distribution valve configured as described above will be described.

The lubricating passage 3 is mainly connected to a main lubricating pipe (not shown) communicating with the electric pump. When lubricating oil is supplied from the main lubricating pipe to the lubricating passage 3 by driving the pump, the valve is closed. The portion 35 and the upper valve body 39 move upward against the spring 10, and the valve portion 35
When passing through 0, the passage 30 communicates with the oil supply passage 3 through the oil supply hole 5, and the oil supply passage 3 communicates with the oil passage 15 through the passage 30 and the communication passage 17.

Then, the lubricating oil is introduced into the rear chamber 8 of the measuring piston 6 by this communication, and the measuring piston 6 is lowered by this introduction, so that a predetermined amount of the lubricating oil measured in the measuring chamber 7 is drained by the draining oil. The oil is discharged from the hole 21 and the oil drain 4 and supplied to a predetermined lubricating point such as a machine tool.

After the refueling is completed, the oil supply main pipe is depressurized. Due to the depressurization, the valve portion 35 and the upper valve body 39 are both lowered by the action of the spring 10, and the valve portion 35 is depressurized. Is returned to the position shown in FIGS. 1 to 3, the oil passage 15 is shut off from the oil supply passage 3, and the oil passage 15 is connected to the communication passage 17, the passage 30, and the insertion holes 29 and 38. The measuring chamber 6 communicates with the measuring chamber 7 via a gap between the measuring chamber 7 and the rush portion 37, and the measuring piston 6 is raised by the action of the spring 10.

Therefore, the lubricating oil supplied to the rear chamber 8 by the lowering of the measuring piston 6 is measured by the rising of the measuring piston 6 through the oil passage 15, the communication passage 17, the passage 30, and the gap. Introduced into chamber 7 and weighed,
Prepare for the next refueling.

In the above configuration, when the valve element 9 is formed in the valve portion 35, the spring receiving portion 36, and the projecting portion 37 as described above, the projecting portion 37 and the insertion hole into which the projecting portion 37 projects. Since the passage leading to the measuring chamber 7 can be formed in the gap between the valve body 29 and the valve body 38, the machining of the valve body can be facilitated as compared with the case where the passage is machined in the valve body 9.
When the valve portion 35 is divided and formed separately from the upper valve body 39,
The valve portion 35 can be easily formed, and the occurrence of stiffness during movement can be reduced as compared with the case where the valve portion 35 is formed integrally with the upper valve body 39, so that the valve body operation can be performed more smoothly and reliably. You can do it. In addition, the distribution valve configured as described above,
The configuration can be changed to a combination of the indicators shown in FIG.

In the distribution valve shown in FIG. 4, the second sleeve 12 is provided with an extension cylinder portion 40 extending upward from the lid portion, and an indicator rod 41 is provided by projecting from the back surface of the measuring piston 6. Is inserted into the extension cylinder 40, and the operation of the piston 6 can be confirmed by visually recognizing the presence or absence of the indicator rod 41 from a viewing window 42 provided in the extension cylinder 40.

In the embodiment shown in FIG. 4, the adjusting screw 27 is screwed onto the extension cylinder 40, and a window for opening the viewing window 42 to the outside is provided outside the extension cylinder 40. The cap 43 is attached.

In the embodiment described above, the passage block 19 is used. However, the passage block 19 is not always necessary, and a passage may be formed directly in the first sleeve 11.

[0038]

According to the present invention, the valve body 1 having the cylinder hole 2 in which the oil supply passage 3 and the oil discharge passage 4 open as described above, the metering piston 6 which is freely movable inside the cylinder hole 2 and A valve body 9 and a spring 10 are provided, and at the time of oil supply, the oil supply passage 3 is communicated with the rear chamber 8 of the measuring piston 6 to move the measuring piston 6 forward, and the lubricating oil in the measuring chamber 7 is drained. 4
At the time of depressurization, the spring of the measuring piston 6 is moved back by the spring 10 so that the lubricating oil in the rear chamber 8 is measured.
In the distribution valve adapted to be supplied to the cylinder bore 2
One end in the length direction is opened, and an oil supply hole 5 communicating with the oil supply passage 3 is opened at the other end. The oil supply hole 5 can be inserted into the cylinder hole 2 and connected to each other in a butt shape. A valve unit body 13 comprising a first sleeve 11 and a second sleeve 12 and capable of housing the metering piston 6, the valve body 9 and the spring 10 therein is formed.
3, a valve unit including the measuring piston 6, the valve body 9 and the spring 10 therein is removably inserted and fixed in the cylinder hole 2, while the valve unit body 13 and the cylinder hole 2 are fixed.
An oil passage 15 extending in the longitudinal direction of the cylinder hole 2
And the oil passage 15 is inserted into the first sleeve 11 inserted into the other end side of the cylinder hole 2 by the operation of the valve body 9, one of the oil supply passage 3 and the measuring chamber 7. A communication passage 17 for selectively communicating with the cylinder bore 2 is provided.
A restricting portion 25 for restricting the movement of the measuring piston 6 to the second sleeve 12 inserted into the open side of the oil passage 15 and the oil passage 15.
Communicating with the back chamber 8 of the measuring piston 6
And at one of the sleeves 11 and 12,
Since the oil drain hole 21 communicating the measuring chamber 7 with the oil drain passage 4 is provided, a valve unit formed by previously incorporating a measuring piston or the like in the valve unit body is simply inserted into the cylinder hole 2. Therefore, the valve unit can be assembled to the valve body 1, and the assembling work can be easily performed. Further, since the valve unit can be formed in advance before assembling to the valve body, the valve body 9 is formed.
Since the operation inspection of the device can be performed in advance to check for a defective product, the yield can be improved.

When the valve element 9 is formed by the spring receiving portion 36, the projecting portion 37, and the valve portion 35, the projecting portion 37 is inserted into the insertion hole 38 so that the valve body 9 is located between the insertion hole 38 and the insertion hole 38. Since the passage for connecting the oil passage 15 to the measuring chamber 7 can be formed in the gap, there is no need to form a passage in the valve body 9, and the valve body processing can be simplified accordingly.

When the valve portion 35 is formed separately from the spring receiving portion 36 and the projection portion 37, the valve portion 35 can be formed in a simple, for example, cylindrical shape, so that the processing can be facilitated. When the valve portion 35 is moved, the valve portion 35 can be smoothly moved without causing a twist.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view at a position shifted by 90 degrees from the sectional position of FIG. 1 in the embodiment.

FIG. 3 is a partially enlarged view in which a first block, a passage block, and a part of a valve body used in the embodiment shown in FIGS.

FIG. 4 is a longitudinal sectional view corresponding to FIG. 1, showing another embodiment of the present invention.

FIG. 5 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve main body 2 Cylinder hole 3 Oil supply path 4 Oil supply path 5 Oil supply hole 6 Measuring piston 7 Measuring chamber 8 Back chamber 9 Valve body 10 Spring 11 1st sleeve 12 2nd sleeve 13 Valve unit body 15 Opening groove 17 Communication path 21 Discharge Oil hole 25 Restriction part 26 Communication hole 35 Valve part 36 Spring receiving part 37 Intrusion part 38 Insertion hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP 7-69037 (JP, B2) JP 62-501721 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16N 25/02

Claims (3)

(57) [Claims] 1. A valve body 1 having a cylinder hole 2 in which an oil supply passage 3 and a drain oil passage 4 are opened, a measuring piston 6 which is freely movable in the cylinder hole 2, a valve body 9 and a spring 10
When refueling, the refueling passage 3 is communicated with the rear chamber 8 of the measuring piston 6 to move the measuring piston 6 forward,
The lubricating oil in the measuring chamber 7 is drained from the oil drain passage 4, and the lubricating oil in the rear chamber 8 is supplied to the measuring chamber 7 by the spring 10 returning the measuring piston 6 when depressurizing. In the distribution valve, one end in the length direction of the cylinder hole 2 is opened, and at the other end, an oil supply hole 5 communicating with the oil supply passage 3 is opened. A valve unit body 13 comprising a first sleeve 11 and a second sleeve 12 which can be connected in a butt shape, and in which the metering piston 6, the valve body 9 and the spring 10 can be housed, is formed. A valve unit including the measuring piston 6, the valve body 9 and the spring 10 is removably inserted into and fixed to the cylinder hole 2, while the cylinder unit 2 is provided between the valve unit body 13 and the cylinder hole 2. Extend lengthwise To form an oil passage 15 that, and the first sleeve inserted into the other end of the cylinder bore 2 1
1, a communication passage 17 is provided for selectively communicating the oil passage 15 with one of the oil supply passage 3 and the measuring chamber 7 by the operation of the valve element 9, and is inserted into the open side of the cylinder hole 2. The second sleeve 12 is provided with a regulating portion 25 for regulating the movement of the measuring piston 6 and a communication hole 26 for communicating the oil passage 15 with the rear chamber 8 of the measuring piston 6. On the other hand, a distribution valve for a centralized lubrication device, wherein an oil discharge hole 21 is provided to connect the measuring chamber 7 to the oil discharge passage 4. 2. The second sleeve 11 has an insertion hole 38 into which the valve element 9 is movably inserted.
6 and a projecting portion 3 which enters the insertion hole 38 with a gap.
7. The distribution valve for a centralized lubrication device according to claim 1, further comprising: a valve portion provided at a distal end side of the protrusion portion and closely inserted into the insertion hole. 3. The centralized lubricating device according to claim 2, wherein a valve portion of the valve body, which is closely fitted into the insertion hole, is formed so as to be divided from a projecting portion, which projects into the insertion hole with a gap. Dispensing valve.