JP2751762B2 - Pump device for lubricating oil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil pump device for supplying lubricating oil to a lubricating oil supply main pipe provided with a distribution valve, and more particularly to a lubricating oil pump device having a depressurizing passage. The present invention relates to a lubricating oil pump device in which a depressurizing valve is provided in a depressurizing passage in conjunction with forward and reverse rotation of a motor so that pressurizing and depressurizing on a main pipe side can be alternately performed.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a tank 1 containing lubricating oil (grease) communicates with a suction side of a pump 3 and a discharge side of the pump 3 communicates with a discharge passage 2.
After the lubricating oil in the tank 1 is discharged to the discharge passage 2 by the pump 3, the lubricating oil is measured by the distribution valves 4,..., 4 provided in the main pipe 33 for supplying the lubricating oil connected to the discharge passage 2. Then, a lubricating oil pump device for supplying a certain amount of oil to the bearings 5,..., 5 has been proposed (see JP-A-4-107399).

A depressurizing passage 6 is provided between the discharge passage 2 on the discharge side of the pump 3 and the tank 1, and a depressurizing valve 7 is provided in the depressurizing passage 6, while the pump 3 is capable of rotating forward and reverse. The motor 8 drives the motor 8 to close the depressurizing valve 7 when the motor 8 rotates in the forward direction, and opens the depressurizing valve 7 when the motor 8 rotates in the reverse direction to depressurize the main pipe 33 side. The motor 8 has an eccentric pin 19 which cooperates with a hook 14 described later. In addition, 9 is a relief valve and 10 is a pressure switch.

As shown in detail in FIG. 5, the depressurizing valve 7 closes the depressurizing passage 6 when sliding rightward (see A and B in FIG. 5) and opens the depressurizing passage 6 when sliding leftward. (See C and D in the same figure). A slide rod 12 is connected to the valve body 11 by a pin 13 and slides together with the valve body 11. The slide rod 12 has a hook 1 for opening and closing the valve body 11.
4 is slidably fitted, and a pin 15 provided on the slide rod 12 is fitted into a long hole 14 a formed in the hook 14.

A spring 16 interposed between the valve body 11 and the hook 14 and a spring 1 interposed between a washer 17 provided on the slide rod 12 and the hook 14
8, the hook 14 is urged to an intermediate position in the axial direction of the slide rod 12.

[0006] Then, as shown in FIG.
During forward rotation (counterclockwise rotation), the eccentric pin 19 of the motor 8 contacts the one end 14 b of the protrusion of the hook 14,
The hook 14 is slid to the right, and the valve body 11 is slid to the right along with the slide rod 12 via the pin 15 in the elongated hole 14a of the hook
Close. The hook 14 is, as shown in FIG.
When the contact of the eccentric pin 19 is released, the spring 16 returns to the intermediate position of the slide rod 12 slid to the right by the urging force of the spring 16.

On the other hand, as shown in FIG. 5C, when the motor 8 rotates in the reverse direction (clockwise rotation), the eccentric pin 19 of the motor 8 rotates.
Abuts on the other end 14 c of the protrusion of the hook 14 to slide the hook 14 to the left, and the valve body 11 slides to the left along with the slide rod 12 via the pin 15 in the elongated hole 14 a of the hook 14. Then, the depressurizing passage 6 is opened. When the contact of the eccentric pin 19 is released as shown in FIG. 5D, the hook 14 is slid leftward by the urging force of the spring 18.
Return to the middle position.

[0008]

However, in the above-described conventional lubricating oil pump device, the hook 14 has the spring 1 supported by the valve body 11 and the washer 17 which move together with the slide rod 12 which slides in the left-right direction.
Since the slide rod 12 is slid rightward, the hook 14
The center a of the protruding portion of the slide rod 12 is shifted to the right from the rotation center b of the eccentric pin 19 (see FIG. 5B).
Is slid to the left, the center a of the protrusion of the hook 14 is shifted to the left from the center of rotation b of the eccentric pin 19 (see FIG. 5D).

Therefore, when the motor 8 is rotated in the reverse direction in the state shown in FIG. 5B, the hook 14 has a small engagement area with the eccentric pin 19, so that the eccentric pin 19 contacts the other end 14c of the hook 14. Instead, they may ride on the upper end 14d. For the same reason, when the motor 8 is rotated forward in the state of FIG. 5D, the eccentric pin 19 may ride on the upper end 14d without abutting on the one end 14b of the hook 14. As a result, the opening and closing operation of the depressurizing valve 7 becomes uncertain, and there is a problem that the lubricating oil pump device does not operate stably.

SUMMARY OF THE INVENTION An object of the present invention is to provide a lubricating oil pump device in which a depressurizing valve is reliably opened and closed.

[0011]

In order to achieve the above object, the present invention provides a motor 8 having an eccentric pin 19 and a pump driven by the motor 8 as shown in FIG. 3, a tank 1 connected to the suction side of the pump 3, a discharge passage 2 connected to the discharge side of the pump 3, and a depressurizing passage provided between the discharge passage 2 and the tank 1. 6, and a pressure relief valve 7 which cooperates with an eccentric pin 19 of the motor 8 to close the pressure relief passage 6 when the motor 8 rotates forward and opens the pressure relief circuit 6 when the motor 8 rotates reversely. In the lubricating oil pump device, the depressurizing valve 7 includes a slide rod 12 and a valve body 1 connected to the slide rod 12 for opening and closing the depressurizing passage 6.
1 and a projection 14 engaging with the eccentric pin 19 of the motor.
and a hook 14 that is slidably fitted to the slide rod 12 and that opens and closes the valve body 11 by engaging the eccentric pin 19 of the motor 8 with the protrusion 14g. 30, the other end of the hook 14 biases the hook 14, and the hook 14 is moved so that the center a of the protrusion 14g of the hook 14 substantially coincides with the rotation center b of the eccentric pin 19. And springs (16, 18) biasing along the slide rod.

[0012]

According to the present invention, the springs 16, 18 for urging the hooks for opening and closing the valve body of the decompression valve 7 are provided.
These springs 16 are supported not by a member which moves together with the slide rod and whose position with respect to the rotation center of the eccentric pin 19 fluctuates, but is supported by a housing 30 which takes a fixed position with respect to the rotation center of the eccentric pin 19. , 18, the center a of the hook 14 is
The center of rotation b of the eccentric pin 19 of FIG. Therefore, the center a of the hook 14 is always affected by the movement of the slide rod 12 and is always
, The eccentric pin 19 does not run on the upper end portion 14d of the hook 14 during forward / reverse rotation, and the depressurizing valve 7 is reliably opened and closed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. 4 and the like, the same components and portions as those of the related art are denoted by the same reference numerals, and detailed description is omitted. FIG.
As shown in FIG. 1, a housing 30 is provided, and a tank 1 containing lubricating oil is formed on an upper portion of the housing 30,
A piston 31 for applying pressure to the lubricating oil in the tank 1 is provided at an upper portion in the tank 1, and the piston 31 is urged downward by a spring 32.

A discharge passage (see a solid arrow) 2 communicating with the discharge side of the pump 3 is provided in the housing 30. A discharge valve 2 (see FIG.
) Is connected to the main pipe 33 for supplying lubricating oil. In the housing 30, a depressurizing passage (see a broken arrow) 6 is provided between the discharge passage 2 on the discharge side of the pump 3 and the tank 1.

The pump 3 is provided above a pump chamber 30a in the housing 30. The pump 3 includes a check valve 34, a pump piston 35, and a crank arm 36. The motor 8 is reciprocally driven by a rotating disk 8a of a forward / reverse rotating motor 8 fixed to the upper surface of the housing 30. In the pump 3, when the crank arm 36 moves forward, the pump piston 35 is moved rightward to open the check valve 34 and discharge the oil in the tank 1 to the discharge passage 2. An eccentric pin 19 is provided on the rotating disk 8 a of the motor 8.

A decompression valve 7 is provided below the pump chamber 30a in the housing 30. The decompression valve 7 closes the decompression passage 6 when sliding rightward, and releases the decompression passage 6 when sliding leftward. And a valve body 11 for opening the valve body. As shown in detail in FIG. 3A, one end 1 of the valve body 11 is provided.
One end 12a of the slide rod 12 is a pin 13a.
Are connected by The other end 11b of the valve body 11 and the other end 12b of the slide rod 12 are slidably supported by the housing 30.

A large-diameter sleeve 37 is fixed to one end 12a of the slide rod 12, and a large-diameter portion 12c is formed to the other end 12b. A hook 14 for opening and closing the valve body 11 is slidably fitted to the slide rod 12 between the large diameter portion 12c and the large diameter sleeve 37. This hook 14
A trapezoidal projection 14g is provided.
, One end 14b, the other end 14c, and the upper end 14d are formed.

As shown in FIG. 1, when the motor 8 is rotated forward (counterclockwise rotation), the eccentric pin 19 of the motor 8 comes into contact with one end 14b of the hook 14, so that the hook 14 is The hook 14 is slid to the right, and the right end surface 14e of the hook 14 comes into contact with the large-diameter sleeve 37.
The valve body 11 is slid to the right together with the slide rod 12 via 7 to close the depressurizing passage 6.

As shown in FIG. 2, when the motor 8 rotates in the reverse direction (clockwise rotation), the eccentric pin 19 of the motor 8 contacts the other end 14c of the hook 14 and slides the hook 14 to the left. Then, the left end surface 14f of the hook 14 comes into contact with the large-diameter portion 12c, and the valve body 11 is slid to the left together with the slide rod 12 via the large-diameter portion 12c to open the depressurizing passage 6. .

Springs 16 and 18 are provided between the right inner wall of the pump chamber 30a of the housing 30 and the right end face 14e of the hook 14, and between the left inner wall of the pump chamber 30a and the left end face 14f of the hook 14. The hooks 14 are biased in the sliding direction by the springs 16 and 18 such that the center a of the protrusion 14 g of the hook 14 substantially coincides with the rotation center b of the eccentric pin 19. .

As shown in FIG. 1, the housing 30 includes a relief valve 9 urged by a ball 39 with a spring 39, an indicator 42 urged by a piston 41 with a spring 41, and a limit switch 43. And a pressure switch 10 comprising:

With the above configuration, as shown in FIG. 3A, when the motor 8 rotates forward, the eccentric pin 19 of the motor 8 abuts on one end 14b of the hook 14 to move the hook 14 rightward. The valve body 11 is slid to the right along with the slide rod 12 via the large-diameter sleeve 37 so that the depressurizing passage 6 is closed. Thereby, pressurization is performed on the main pipe 33 side. The hook 14 is shown in FIG.
When the contact of the eccentric pin 19 is released as shown in (B), the position at which the urging force of the spring 16 balances with the urging force of the spring 16, that is, the center a of the protrusion 14g of the hook 14 is moved. The eccentric pin 19 returns to a position substantially coincident with the rotation center b.

On the other hand, as shown in FIG. 3C, when the motor 8 rotates in the reverse direction, the eccentric pin 19 of the motor 8 comes into contact with the other end 14c of the hook 14, and the hook 14 is slid to the left. The left end face 14f of the hook 14 comes into contact with the large diameter portion 12c, and the valve body 11 is slid to the left along with the slide rod 12 via the large diameter portion 12c to open the depressurizing passage 6. The hook 14 is, as shown in FIG.
When the contact of the eccentric pin 19 is released, the urging force of the spring 18 balances the urging force of the spring 16, that is, the position where the center a of the hook 14 substantially coincides with the rotation center b of the eccentric pin 19. Return.

Therefore, the hook 14 is connected to the spring 1
In steps 6 and 18, the center a of the hook 14 is always held at the rotation center b of the eccentric pin 19 irrespective of the slide position of the slide rod 12, so when the motor 8 is rotated in the state shown in FIG. The eccentric pin 19 accurately abuts on the other end 14c of the hook 14, and there is no risk of climbing on the upper end 14d. Further, when the motor 8 is rotated forward in the state of FIG. 3D, the eccentric pin 19 accurately contacts the one end 14b of the hook 14, and there is no possibility of riding on the upper end 14d.
As a result, the opening and closing operation of the depressurizing valve 7 is ensured, and the lubricating oil pump device operates stably.

[0025]

As apparent from the above description, the lubricating oil pump device of the present invention has a housing in which the center of the hook fitted to the slide rod substantially coincides with the rotation center of the eccentric pin of the motor. The hook is urged by the spring supported by. Since the housing supporting the spring is always at a fixed position with respect to the center of rotation of the eccentric pin, the spring is supported by a member whose position with respect to the center of rotation of the eccentric pin varies with the movement of the slide rod. Unlike technology,
The center of the hook can always be held at the center of rotation of the eccentric pin regardless of the movement of the slide rod. Therefore, during forward and reverse rotation of the motor, there is no possibility that the eccentric pin rides on the upper end of the hook, the depressurizing valve is reliably opened and closed, the lubricating oil pump device operates stably, and the reliability is improved. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a lubricating oil pump device according to the present invention when the motor rotates forward.

FIG. 2 is a cross-sectional view of the apparatus of FIG. 1 when the motor rotates in reverse.

FIG. 3 is an operation diagram showing a relationship between an eccentric pin and a hook.

FIG. 4 is a circuit diagram of a lubricating oil pump device.

FIG. 5 is an operation diagram showing a relationship between a conventional eccentric pin and a hook.

[Explanation of symbols]

1 ... tank, 2 ... discharge passage, 3 ... pump, 4 ... distribution valve,
6 ... decompression passage, 7 ... decompression valve, 8 ... motor, 11 ... valve body, 12 ... slide rod, 14 ... hook, 14b ... one end, 14c ... other end, 14g ... protruding part, 16, 18 ...
Spring, 19: eccentric pin, a: center of protrusion, b:
Rotation center of eccentric pin, 33 ... Main pipe for supplying lubricating oil.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 59-25797 (JP, U) Japanese Utility Model Showa 60-91892 (JP, U)

Claims (1)

(57) [Claims] A motor (8) having an eccentric pin (19) and capable of rotating forward and backward, a pump (3) driven by the motor (8), and a tank connected to a suction side of the pump (3). (1) a discharge passage (2) connected to the discharge side of the pump (3); and a depressurization passage (6) provided between the discharge passage (2) and the tank (1). In cooperation with the eccentric pin (19) of the motor (8), the depressurizing passage (6) is closed when the motor (8) rotates forward, and the depressurizing circuit ( 6) A lubricating oil pump device having a depressurizing valve (7) for opening the lubricating oil, wherein the depressurizing valve (7) is connected to the slide rod (12) and the slide rod (12), and is connected to the depressurizing passage ( 6) engages with the valve body (11) for opening and closing, and the eccentric pin (19) of the motor. Out section (14
g), and is slidably fitted to the slide rod (12), and the valve body (11) is engaged by engagement of the eccentric pin (19) of the motor (8) with the protrusion (14g). A hook (14) for opening and closing, and one end of each of the hooks (14) are supported by the housing (30), and the other end of the hook (14) urges the hook (14).
A spring (4) for urging the hook (14) along the slide rod so that the center (a) of the projection (14g) of (4) substantially coincides with the rotation center (b) of the eccentric pin (19). 16. A lubricating oil pump device comprising: