JPH0222560Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a lubrication pump device for supplying a predetermined amount of lubricating oil to moving parts of machine tools, power vehicles, industrial machinery, etc., that is, parts that require lubrication. It is something.

(Prior art) As one of such lubricating pump devices, Jikosho
What is described in Publication No. 51-25763 is a casing, a cylinder block disposed inside the casing, a piston disposed so as to be able to reciprocate and slide in the axial direction within the cylinder hole, and a cylinder block disposed within the casing, and a cylinder block disposed within the casing. The cylinder block has a suction port and a discharge port for lubricating oil, and check valves are disposed in each of these ports, and the piston reciprocates and slides within the cylinder hole. suction the lubricating oil inside the casing from the suction port, and
It is configured to discharge from a discharge port.

In this known lubricating pump device, the driving means for causing the reciprocating sliding displacement of the piston includes a motor attached to the casing, a power transmission shaft whose one end is fixed to the output shaft of the motor, and the other end of the power transmission shaft. a reduction gear mechanism coupled to the reduction gear mechanism; and a cam mechanism disposed in association with the output end of the reduction gear mechanism to convert rotation of the motor output shaft into reciprocating sliding displacement of the piston within the cylinder bore. The reduction gear mechanism is
It usually consists of a number of gears or a combination of worms and worm wheels. The cam mechanism includes a ball disposed so as to be able to roll on a receiving member that is integral with the cylinder block, a coaxial end cam element that is pressed against the ball and integral with the piston, and a coaxial end cam element that is pressed against the ball and is integral with the piston. It consists of a compression coil spring for pressing the element against the ball.

(Problems to be Solved by the Invention) In the known lubricating pump device having the above-mentioned configuration, the driving means for causing reciprocating sliding displacement of the piston within the cylinder hole has a complicated configuration that requires high assembly accuracy. Because it includes a reduction gear mechanism,
It is difficult to improve productivity and reduce costs at the same time. In addition, such a reduction mechanism not only requires self-lubrication, but also requires the main axis of the reduction mechanism to be horizontal with respect to the output shaft of the motor, which is normally arranged vertically, which reduces power transmission efficiency. , which necessitates the use of a relatively large motor.
Moreover, it was still considered difficult to achieve sufficient service life and high operational reliability.

(Means for Solving the Problems) The present invention aims to propose a more improved lubricating pump device that can solve the above-mentioned drawbacks of the prior art at once by simple and inexpensive means. The purpose is

In order to achieve such an object, the lubrication pump device according to the present invention has a power transmission system in which the drive means is composed of a motor attached to a casing and a single compression coil spring having one end fixed to the output shaft of the motor. and a cam mechanism disposed at the other end of the power transmission member to convert rotation of the output shaft of the motor into reciprocating sliding displacement of the piston within the cylinder hole, the cam mechanism being integral with the cylinder block. A ball is arranged so as to be able to roll with respect to a receiving member, and the ball is pressed by a power transmission member and is integrally disposed coaxially with the piston, forming one stepped portion. an end cam element having a helical lead cam surface.

(Function) According to the lubrication pump device of the present invention having the above-described configuration, the following effects can be achieved.

When the motor is operated and a single compression coil spring serving as a power transmission member is rotated around its axis, a cam mechanism disposed at the other end of the power transmission section also rotates.

Then, the end face cam element fixed to the other end of the power transmission member rotates relative to the receiving member via the ball disposed in the recess of the stationary receiving member, and the end face cam element fixed to the other end of the power transmission member rotates relative to the receiving member through the ball disposed in the recess of the stationary receiving member. The power transmission member is compressed and displaced in its axial direction. In addition,
The ball rolls within the recess.

Therefore, the piston integral with the end cam element moves axially upwardly within the cylinder.
Vertical oil is sucked into the cylinder through the suction port.

Then, as the rotation of the end cam element progresses and the stepped portion of the helical lead cam surface reaches the ball position,
The compression coil spring instantly pushes the piston down and returns to its initial position, pressurizing the lubricating oil sucked into the cylinder.

However, since a check valve is provided at the suction port, the pressurized lubricating oil is sent out from the discharge port.

(Embodiments) The present invention will be described below with reference to preferred embodiments shown in the drawings.

The lubricating pump device according to this embodiment includes a casing 1 that also serves as a lubricating oil reservoir. A board 2 is arranged on the upper part of the casing 1, and a drive motor 3 is mounted on the board 2, and its output shaft penetrates the board 2 and projects downward. motor 3
In this example, the motor is composed of a small synchronous motor with an output torque of about 150 g·cm.

Inside the casing 1, a cylinder block 4 is disposed near its lower bottom.
is attached to the substrate 2 via a suitably shaped bracket 4A. The cylinder block 4 has a vertical cylinder hole, and the centerline axis of this cylinder hole substantially coincides with the centerline axis of the output shaft of the motor 3. The cylinder block 4 has a suction port 5 that opens downward and a discharge port 7 that opens sideways at its lower end, and pole check valves 6 and 8 are arranged in both ports 5 and 7, respectively. . Further, adjacent to the suction port 5, a filter 9 made of felt having a mesh roughness of 40 μm is attached to the cylinder block 4, for example.

The cylinder block 4 has an outer periphery at the center in the axial direction formed as a screw, and a nut 10 is attached to the screw.
It is fixed to the bracket 4A by joining them. A recess is formed in the upper part of the nut 10, and a ball 11 having its upper surface as a rolling surface is placed in the recess. That is, the nut 10 also functions as a receiving member for the ball 11. It goes without saying that the piston 12 is disposed within the cylinder hole of the block 4 so as to be able to reciprocate and slide in the axial direction, but the upper end of the piston 12 is made to protrude upward from the block 4 by a predetermined amount. A substantially cylindrical end face cam element 13 is fixed at the upper end to the protruding end of the piston 12.
The lower end surface of the nut 1 is formed as a cam surface.
It is brought into contact with the ball 11 in the recess 0.

Further, a compression coil spring 15 is provided as a power transmission member between the cam element 13 and a coupling ring 14 fixed to the output shaft of the motor 3 by appropriate means.
At the same time, a thrust bearing 16 is arranged between the coupling ring 14 and the base plate 2. With this arrangement, when the motor 2 is operated, the cam element 13
When the piston 12 rotates while maintaining contact with the ball 11, the piston 12 fixed to the cam element 13 is displaced in the axial direction within the cylinder hole according to the cam profile. Its cam profile allows the piston 12 to rotate during up to 360° of rotation of the cam element 13.
The amount of upward displacement in the axial direction increases in proportion to the rotation angle, and the amount of displacement becomes zero when rotated 360 degrees. That is, the cam surface of the cam element 13 is formed as a helical lead cam surface having one stepped portion around the entire circumference.

The operation of the embodiment according to the above configuration will be explained as follows. That is, when the motor 3 is operated for a predetermined period of time at preset intervals by a control circuit (not shown), the cam element 13 is moved to the ball 1 via its output shaft, the coupling 14 and the compression coil spring 15.
while maintaining relative rolling contact with 1. Then,
The cam element 13 has a helical lead cam surface and
The piston integrated with the cam element 13 reciprocates in the axial direction while compressing the compression coil spring as a power transmission member in response to the relative rotational movement with the stationary receiving member 10 via the ball 11. 12 also reciprocates and slides within the cylinder hole. Note that since the contact portion between the ball 11 and the cam surface of the cam element 13 is immersed in lubricating oil, the contact portion is always in a self-lubricating state. When the piston 12 moves up within the cylinder bore, the lubricating oil in the casing 1 is sucked into the cylinder via the filter 9 and the check valve 6 at the suction port 5 of the cylinder block 4. Furthermore, when the piston 12 descends within the cylinder hole, the lubricating oil sucked into the cylinder is discharged through the check valve 8 at the discharge port 7 and a conduit (not shown) to the lubricating area.

(Effects of the invention) According to the invention, the output shaft of the motor and the end cam element are directly connected by only a single compression coil spring, and all of the main movable members are arranged almost in a straight line. With this configuration, power transmission efficiency can be significantly improved. That is, according to the prior art described above, since the reduction gear mechanism is interposed in the power transmission system, it is difficult to improve the power transmission efficiency, and the output torque of the drive motor is 2.
In some cases, a large device of about 100 g/cm was required, but according to the present invention, even a small and inexpensive device with an output torque of about 150 g/cm can perform the same function.

In addition, the simple configuration described above can significantly reduce the number of required parts and does not require high assembly precision, making assembly of the entire device even easier, which in turn improves productivity and reduces costs. reduction is possible.

That is, according to the present invention, it is possible to realize a more improved lubricating pump device that can solve all the drawbacks of the prior art described above.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a lubricating pump device according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Casing, 2... Board, 3... Motor, 4... Cylinder block, 5... Suction port, 7... Discharge port, 6, 8... Check valve,
10... Reception member, 11... Ball, 12... Piston, 13... End face cam element, 15... Compression coil spring.

Claims (1)

[Claims for Utility Model Registration] A casing, a cylinder block disposed inside the casing, a piston disposed so as to be slidably displaced back and forth in the axial direction within the cylinder hole, and a drive means for causing such displacement of the piston. The cylinder block has a suction port and a discharge port for lubricating oil, and check valves are disposed in each of these ports, and the piston slides back and forth within the cylinder hole to lubricate the inside of the casing. sucking oil from the suction port;
The lubricating pump device discharges water from a discharge port, and the driving means includes a motor attached to a casing and a power transmission member comprising a single compression coil spring having one end fixed to an output shaft of the motor. ,
a cam mechanism disposed at the other end of the power transmission member to convert rotation of the output shaft of the motor into reciprocating sliding displacement of the piston within the cylinder hole, the cam mechanism being integral with the cylinder block; A ball is disposed so as to be able to roll with respect to the receiving member, and the ball is pressed by the compression coil spring and is integrally disposed coaxially with the piston to form one stepped portion. an end cam element having a helical lead cam surface, wherein the piston moves upward within the cylinder hole in response to the helical lead cam surface of the end cam element, and at the stepped portion thereof, the spring force of the compression coil spring is applied. A lubrication pump device that is characterized by instantaneously returning to its initial position under action.