DE10135709C1 - Universal lubricated sliding bearing for cogwheel pump has lubrication slot supplied with residual material in dead space of cog mechanism - Google Patents

Abstract

The sliding bearing has a lubrication slot, supplied via a slot in the end face of the sliding bearing with the residual material in the dead space of the cog mechanism and an annular slot for cooling the bearing, a second sliding bearing having a rectangular thread for directing the leakage flow outwards or back to the input of the cogwheel pump via a feedback slot (C).

Description

The invention relates to a plain bearing (GLA and GLB) for a gear pump, with a lubrication groove in the surface of the plain bearing (GLA) The direction of shaft rotation is more than a quarter of the plain bearing diameter and runs out about 2 mm before the end of the plain bearing (GLA), which is provided by a recess on the end face of the plain bearing (GLA) from the trapped material from the tooth base and tooth head forced lubricated is, so that the tooth load and the bearing load associated with it this process is reduced.

A reduction in the tooth or bearing load can be found in the patent specification EP- 0754859 A2 (relief holes in the tooth) or from the patent specification EP- 0677660 B1 (recesses in the bearing and housing), known.

The version according to EP-0754859 A2 is complex to manufacture and includes Dead spaces or holes in the tooth that cannot be checked.

The version according to EP-0677660 B1 has recesses on the pressure side and on the inlet side. But since the dead space of the gearing only shortly before highest point and the pressure peak is greatest at the highest point is, there can be no effective relief of the gearing and thus also the Bearing load.

The publications EP 0833068 A1 (plain bearing with lubrication groove) and EP 0715078 A2 (plain bearings with cooling holes) are known and not with the function of compare slide bearing according to the invention.

The purpose of the plain bearing (GLB) is to deflect the splines minimize and control the leakage current in the surface of the Plain bearing (GLB) a single or multi-start rectangular thread (F) incorporated is that controls the leakage current to the outside, or when not accelerated Materials such as elastomers, polymers or other media to be conveyed via a Return groove (C) by replacing the plain bearing (GLB) from driven to the driven shaft, by turning the holding plate (B) by 180 ° released and by the changed promotional effect of the plain bearing (GLB) of the Leakage current is fed back into the input of the gear pump.

Plain bearings with internal spiral grooves or threads are known and in Use, however, these versions are not universally applicable as before described.  

Intensive temperature control means that the elastomer or polymer overheats largely excluded. Thanks to the redesigned return groove (C) for the Bearing leakage current, designed for a serration, is the gear pump for Elastomers and polymers can be used equally.

The invention has the following advantages:
The symmetrical design offers advantages such as interchangeability of all components, lower manufacturing costs and very short changeover times of splines and bearings without having to remove the gear pump. The intensive temperature control of the ring cooling of the plain bearings results in a lower temperature load on the polymer or elastomer in the plain bearings.

Forced lubrication of the bearings due to the central position of the relief or Lubrication groove in the flat surface of the bearings so that the leakage current fills the lubrication groove and this results in forced lubrication with simultaneous pressure relief of the Tooth waves.

Due to the newly designed slide bearing construction according to the invention otherwise usual recesses in the pump housing and in the pump housing covers. The expansion of the plain bearing can thus be done on both sides, which in the installed and tempered state of the gear pumps can take place.

The usual disassembly of the pump and re-tempering in removed condition for the purpose of lowering the viscosity of the Gear pump remaining material, which is in the columns of the storage and has set teeth to push out splines and bearings, eliminated.

Universal usability due to the symmetrical structure and the Change of direction of rotation of the rectangular thread of the external bearing Gear shaft.

By turning the housing cover by 180 ° and removing a sealing screw the function of the rectangular thread in the external bearing in opposite directions and promotes in the case of polymers or other unaccelerated materials, the bearing leakage current in the inlet of the gear pump back.

The invention permits numerous embodiments and is described below of drawings explained for example.

It shows:

Fig. 1, the cover plate with the feedback groove according to the invention.

Fig. 2 shows a section of the pressure plate with the outer slide bearing according to the invention.

Fig. 3 is a view of the housing with the annular groove according to the invention for temperature control and leakage current drilling.

Fig. 4, the plain bearing with the relief groove according to the invention.

Fig. 5 shows the plain bearing in section with the lubrication groove according to the invention.

Fig. 1 shows the return groove C for the bearing leakage current, which opens or closes the path to the hole J for the plain bearing leakage current by rotating the holding plate B by 180 °.

Fig. 2, the inventive sliding bearing GLB are presented with the rectangular thread F B by 180 ° change, by rotating the holding plate, the slope of the square thread F to the rotational direction of the gear shafts K.

Fig. 3 shows the annular groove H according to the invention, with a depth of half the plain bearing, for the temperature control and the return hole J for the plain bearing leakage current.

Fig. 4 shows the arrangement of the relief groove E according to the invention, which removes the material residue from the dead space of the toothing and thus presses into the lubricating groove D of the plain bearing GLA, which is at an angle of 90 °.

Fig. 5 is a section through the plain bearing GLA with the inventive arrangement of the lubrication groove D, which runs out about 2 mm before the end of the plain bearing GLA.

LIST OF REFERENCE NUMBERS

GLA plain bearings
GLB plain bearing with rectangular thread
A pump housing
B holding plate
C Bearing leakage current return groove
D Bearing lubrication groove
E Relief groove for tooth base for feeding the lubrication groove
F Rectangular thread for bearing leakage current control
G mounting holes for bearings
H ring groove for temperature control (

1

/

2

Storage height low)
J Bore for bearing leakage current

Claims (6)

1. plain bearing (GLA and GLB) for a gear pump, with a lubrication groove (D), which by a relief groove (E) in the end face of the first plain bearing (GLA), through which material residues are conveyed out of the dead space of the gearing, is lubricated, and at the end of the plain bearing (GLA), which is tempered by ring cooling (H), is leaking, and with a second plain bearing (GLB) with a single or multi-start rectangular thread (F), the second plain bearing either when forming the thread (F) in Direction of rotation of the shaft leads the leakage current to the outside, or the leakage current via a return groove (C) into the inlet of the gear pump is traceable, provided the rectangular thread is opposite to the direction of shaft rotation runs. 2. plain bearing according to claim 1, characterized in that the first plain bearing (GLA) has no shoulder and from the outside through the second plain bearing (GLB) and the holding plate (B) is screwed. 3. plain bearing according to claim 1 or 2, characterized in that the lubricating groove (D) starts from the dead point of the gearing and in the shaft rotation direction at most over a quarter of the plain bearing runs and ends at the end of the plain bearing (GLA). 4. plain bearing according to one of claims 1 to 3, characterized in that the Relief groove (E) in the end face of the first plain bearing (GLA) at an angle of 90 ° to the entrance of the lubrication groove (D). 5. plain bearing (GLA) according to one of claims 1 to 4, characterized in that the plain bearings (GLA, GLB) are installed with heat-conductive paste and that through an annular groove (H) in the housing, which is directly above the plain bearings (GLA) are arranged, tempered covering half of the plain bearing depth (GLA) becomes. 6. plain bearing according to one of claims 1 to 5, characterized in that the changed delivery effect of the second plain bearing by turning the holding plate is reached by 180 °.