CN111043509B

CN111043509B - Injection type oil ejector

Info

Publication number: CN111043509B
Application number: CN201910504811.8A
Authority: CN
Inventors: J.克罗茨肯珀; R.林德曼; M.威特
Original assignee: SKF Lubrication Systems Germany AG
Current assignee: SKF Lubrication Systems Germany GmbH
Priority date: 2018-10-15
Filing date: 2019-06-12
Publication date: 2023-03-10
Anticipated expiration: 2039-06-12
Also published as: DE102018217636A1; JP7427371B2; CN111043509A; JP2020063735A

Abstract

The invention relates to a jet lubricator (1) having a cavity (4) for receiving a quantity of lubricant, a dosing piston (6) and an operating piston (8), wherein the dosing piston (6) is designed to discharge lubricant present in the cavity (4) in an operating state and to release the cavity (4) for receiving the lubricant in an inoperative state, wherein the operating piston (8) can be controlled by a fluid and is designed to operate the dosing piston (6), wherein the cavity (4), the dosing piston (6) and the operating piston (8) are arranged in a stepped bore (10), wherein the stepped bore (10) is designed as a blind bore.

Description

Injection type oil ejector

Technical Field

The present invention relates to a squirt lubricator having a cavity for receiving a quantity of lubricant.

Background

The squirt lubricator is used to deliver and dose the lubricating material. In this case, the supply of the lubricating material from the central reservoir or central conduit is carried out, wherein a jet lubricator is connected to the reservoir or conduit for supplying a certain amount of lubricant to the lubrication points. However, in previous squirt injectors, it was not possible to achieve a constant repeatability with certain tolerances for a certain small amount of dosage. The reason is primarily that component tolerances, which make small dosing quantities difficult, arise as a result of the arrangement and mounting of such a squirt gun. This situation also includes, for example, an unfavorable diametral stroke ratio of the dosing piston, which is defined in the previous squirt lubricators by a diameter of 3mm and a stroke of 0.43 mm. In particular, a very small stroke hardly allows component tolerances without affecting the amount of dosage.

Disclosure of Invention

The object of the invention is therefore to provide a jet lubricator which allows small dosing amounts with small tolerance fluctuations of Xu Banyou.

This technical problem is solved by a jet lubricator.

The squirt lubricator has a cavity for receiving a quantity of lubricant, a dosing piston which is designed to discharge lubricant located in the cavity in an operating state (or called actuated state) and to release the cavity for receiving lubricant in an inoperative state, and an operating piston which can be controlled by a fluid and is designed to operate the dosing piston.

If the dosing piston is stationary, the lubricant is located in the cavity. If the actuating piston is then controlled (or actuated, driven) by the fluid, it moves in the direction of the dosing piston and actuates the dosing piston. The dosing piston displaces lubricant located in the cavity to supply lubricant to the lubrication site.

According to the jet lubricator proposed here, the cavity, the dosing piston and the operating piston are arranged in a stepped bore which is designed as a blind bore. The stepped bore can be provided in the housing of the jet lubricator. The installation of the components is thereby carried out only from one side of the blind hole, whereby the orientation of the components to one another is simplified, since they do not have to be guided into the stepped hole from two different sides. Thereby reducing tolerance effects between components. Furthermore, this also leads to a reduction in the manufacturing costs, since only one hole needs to be realized from one side. Furthermore, it is ensured by small tolerances that the predefined dosing quantity is not influenced, or at least only slightly influenced, by the mounting of the components.

According to one embodiment, the stepped bore is designed with radially extending openings in the region of the operating piston in order to feed fluid to the operating piston. The fluid is in particular air, for example compressed air, or oil. The radially extending opening may be connected to a fluid delivery unit for delivering fluid to the operating piston. The fluid or air introduced acts on the operating piston and moves it in the direction of the dosing piston. The dosing piston is operated in this way in order to expel the lubricant.

In order to ensure that the fluid introduced does not flow past the actuating piston, the actuating piston can have a circumferential sealing ring which seals the stepped bore in a fluid-tight manner. Such a sealing ring ensures that the fluid acts on the operating piston and does not diffuse past the operating piston into the stepped bore.

According to another embodiment, the stepped bore has a first diameter in the region of the operating piston and a second diameter in the region of the dosing piston, wherein the first diameter is smaller than the second diameter. The stepped bore may also have other steps, wherein a minimum diameter is provided at the closed end of the blind bore and a maximum diameter is provided at the open end of the blind bore. This is particularly advantageous in that the operating piston with the sealing ring can be guided first through a large diameter without following the steps Kong Moceng on the stepped bore. In this way the sealing means is not damaged during insertion of the operating piston. The actuating piston only has to be inserted precisely into the last section of the stepped bore, but this does not adversely affect the sealing device, i.e. the "bending risk" is significantly reduced, because the length of the region with the small diameter is small.

According to another embodiment, the stepped bore has a radially extending opening in the region of the cavity for delivering lubricant to the cavity. The radially extending opening may be connected in particular to a lubricant delivery unit. In addition, the stepped bore can have a relief opening in this region in order to achieve pressure compensation during the discharge of lubricant. The lubricant delivery unit may be connected to a central lubricant reservoir or lubricant conduit. If the dosing piston is not actuated and the cavity for receiving the lubricant is released, the lubricant is guided from the lubricant delivery unit into the cavity. If the dosing piston is actuated, the lubricant is discharged from the cavity and at the same time the lubricant is prevented from being fed into the cavity. In this way, it is ensured that only the quantity of lubricant located in the cavity is always discharged, as a result of which an exact dosage or metering of the discharged lubricant can be ensured.

According to another embodiment, the actuating piston is connected to the dosing piston via a spring element. By means of the spring element, it is achieved that, after the actuating piston has been actuated by the fluid, the actuating piston is pressed against the dosing piston against the pretensioning force of the spring element and is then pressed out of the dosing piston again by the pretensioning force of the spring element. The spring element can define a dosing stroke by its pretensioning force or its spring displacement.

According to another embodiment, the squirt gun is a micro-dispensing squirt gun, wherein the amount of lubricant in the cavity is preferably less than 5mm ³ . The amount of lubricant in the cavity is in particular less than 3mm ³ 。

Preferably by means of a squirt lubricator, which dose deviates maximally +/-10%. This is achieved in that the dosing piston has a stroke and a diameter, wherein the ratio of stroke to diameter is approximately 1. The stroke is in particular about 1.5mm and the diameter is about 1.6mm. In this way, the piston diameter is reduced to 1.6mm compared to the known diameter of not more than 3 mm. At the same time, the stroke is extended to 1.5mm (formerly 0.43 mm), whereby a significantly more precise dosing can be achieved. This diameter-to-stroke ratio allows for greater component tolerances because the stroke is increased compared to known squirt lubricators.

Further advantages and advantageous embodiments are given in the description, the drawing and the claims. The combination of features given here, in particular in the description and the drawings, is purely exemplary, so that these features can also be present individually or in other combinations.

The invention will be further elucidated on the basis of an embodiment shown in the drawing. The embodiments and combinations shown in the embodiments are purely exemplary here and should not limit the scope of protection of the invention. The scope of protection is only limited by the claims.

Drawings

Shown in the drawings are:

FIG. 1 illustrates a cross-sectional view of a squirt gun in accordance with a preferred embodiment; and

FIG. 2 shows a perspective view of the squirt lubricator of FIG. 1.

In the following, identical or functionally identically acting elements are identified with the same reference numerals.

Detailed Description

Fig. 1 and 2 show a sectional view and a perspective view of a squirt lubricator 1, which is mounted in a housing 2. The squirt gun 1 has a cavity 4 for containing a quantity of lubricant. The squirt gun 1 also has a dosing piston 6 and an operating piston 8. The cavity 4, the dosing piston 6 and the operating piston 8 are arranged in a stepped bore 10 in the housing 2, which stepped bore 10 is designed as a blind bore.

In operation, the dosing piston 6 is actuated by the actuating piston 8 in order to transfer lubricant to the lubrication point, so that the dosing piston 6 is moved into the cavity 4 and thus discharges lubricant located in the cavity 4 from the squirt gun. The discharge direction of the lubricant is indicated by arrow 12.

In the region of the actuating piston 8, a radial opening 16 is provided in the stepped bore, which can be connected to a fluid supply unit (not shown). Through the radial opening 16, fluid can be introduced into the stepped bore 10, on the one hand, in order to control the operating piston. In addition, air is again discharged to effect the return movement of the operating piston 8. The fluid may in particular be compressed air.

If a pressure fluid, for example compressed air, is introduced through the radial opening 16, it presses on the actuating piston 8 and thereby moves the actuating piston 8 counter to the biasing direction of the spring element 18. The dosing piston has a dosing stroke 20, which dosing stroke 20 is defined by the spring element 18. The dosing stroke 20 may be, for example, about 1.5mm and the dosing piston may have a diameter of about 1.6mm. This ratio ensures greater tolerances with regard to inaccuracies during production.

The dosing piston 6 is moved into the cavity 4 by the movement of the operating piston 8 and the lubricant present there is discharged at a certain pressure through the non-return valve 22. If the operating piston 8 is now moved back again or by the spring element 18 back again into its original position, the dosing piston 6 is also moved back and the non-return valve 22 is likewise moved into its original position by the spring element 24 in order to seal the cavity 4 from the environment again.

A fluid, in particular compressed air, is introduced into the stepped bore 10 via the radial openings 16, the stepped bore 10 forming a cavity 17 in the region of the actuating piston. In order to ensure that no uncontrolled leakage of pressure fluid or compressed air can occur from the cavity 17, a sealing ring 14 is provided around the operating piston 8. A sealing ring 14 seals the operating piston 8 in a fluid-tight manner from the stepped bore. However, if fluid or air flows past the sealing ring 14, a further sealing device 34 is arranged around the jet lubricator 1, which further sealing device 34 seals off from the stepped bore 10. These sealing devices 34 are also used to seal the individual components, mainly the cavity 4, against the exiting lubricant.

In the region of the cavity 4, the stepped bore 10 has a radial opening 26, which radial opening 26 can be connected to a lubricant supply unit (not shown). If the dosing piston 6 is in the non-operating state, i.e. the cavity 4 is open, new lubricant is introduced into the cavity 4 by the lubricant delivery unit. The radial opening 26 additionally has a bleeder screw 28 in order to compensate the pressure in the cavity 4. This relief opening is likewise designed as a relief opening 30 in the region of the actuating piston 8 and as a relief opening 32 in the region of the spring element 18 in order to achieve a pressure compensation during the control of the actuating piston 8.

With the above-described squirt lubricator, it is possible to inject oil at less than 5mm per stroke ³ With a small dosage amount a dosage accuracy with a tolerance of +/-10% is achieved. This is achieved, on the one hand, in that the jet lubricator is arranged in a stepped bore designed as a blind bore. Thus, the individual components of the squirt lubricator are inserted into the stepped bore from one side, whereby a more precise arrangement of the components relative to one another can be achieved. Another way of achieving this is that the dosing piston has a stroke of about 1.5mm and a diameter of about 1.6mm. Greater component tolerances can be achieved by this diametral stroke ratio, since the stroke is greater than in known squirt lubricators.

List of reference numerals

1. Injection type oil ejector

2. Shell body

4. Hollow cavity

6. Batching piston

8. Operating piston

10. Stepped hole

12. Discharge direction

14. Sealing ring

16. Radial opening

17. Hollow cavity

18. Spring element

20. Dispensing stroke

22. Check valve

24. Spring element

26. Radial opening

28. Air release screw

30. Air release port

32. Air release port

34. Sealing device

Claims

1. A squirt lubricator (1) having a cavity (4) for accommodating a quantity of lubricant, a dosing piston (6) and an operating piston (8), the dosing piston (6) being designed to discharge lubricant present in the cavity (4) in an operating state and to release the cavity (4) for accommodating the lubricant in an inoperative state, wherein the operating piston (8) can be controlled by a fluid and is designed to operate the dosing piston (6),

characterized in that the cavity (4), the dosing piston (6) and the operating piston (8) are arranged in a stepped bore (10), wherein the stepped bore (10) is designed as a blind bore.

2. The squirt lubricator according to claim 1, wherein the stepped bore (10) has radially extending openings (16) in the region of the operating piston (8) for conveying fluid to the operating piston (8).

3. The squirrel lubricator of claim 1, wherein the fluid is air or oil and the air is compressed air.

4. The squirt lubricator according to claim 1, wherein the operating piston (8) has a surrounding sealing ring (14), the sealing ring (14) sealing the stepped bore (10) in a fluid-tight manner.

5. The squirt lubricator according to claim 1, wherein the stepped bore (10) has a first diameter in the region of the operating piston (8) and a second diameter in the region of the dosing piston (6), wherein the first diameter is smaller than the second diameter.

6. The squirt lubricator according to claim 1, wherein the stepped bore (10) has a radially extending opening (26) in the region of the cavity (4) for delivering lubricant to the cavity (4).

7. The squirt lubricator according to claim 1, wherein the operating piston (8) is connected to the dosing piston (6) by a spring element (18).

8. Squirt lubricator according to claim 1, wherein the squirt lubricator (1) is a micro-dosing squirt lubricator, wherein the quantity of lubricant present in the cavity (4) is less than 5mm ³ 。

9. The squirt lubricator according to claim 1, wherein the dosing piston (6) has a stroke and a diameter, wherein the ratio of stroke to diameter is 1.

10. The squirt lubricator of claim 9, wherein the stroke is equal to 1.5mm and the diameter is equal to 1.6mm.