JPH084663A - Gear pump - Google Patents

Abstract

PURPOSE:To eliminate the use of equipment such as a temperature controller for cooling and heating medium, a heat exchanger and piping without any need for additional manufacture of a bearing even if the working condition of resin or a gear pump is changed. CONSTITUTION:This gear pump, whose bearing is lubricated with resin, is provided with corresponding tapered parts 6, 5 formed respectively at a gear shaft 3 and a bearing 2 which form a bearing part, whereas the bearing 2 is mounted so as to reciprocate in the axial direction (arrowed direction X) of the gear shaft 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear pump used for extrusion molding of synthetic resin.

[0002]

2. Description of the Related Art Conventionally, in synthetic resin extrusion molding,
A gear pump is used to stabilize the flow of resin, and particularly in the extrusion molding of a hard vinyl chloride resin that is sensitive to heat, as a gear pump, as shown in FIG. 2, a gear pump in which a bearing portion 21 is lubricated with resin is used. 22 may be used. The gear pump 22 lubricates the bearing portion 21 by injecting a part of the resin extruded from the extruder into a gap between the gear shaft 24 and the bearing 23 having an inner peripheral surface formed in a groove shape.

And, in this gear pump 22,
The resin used for lubrication is not returned to the product resin to prevent deterioration, but is discharged to the outside after lubrication. To adjust the amount of lubricating resin, 1) adjust the size of the bearing groove and the gap between the gear shaft and the bearing. The method is 2) in which the viscosity of the resin is changed by adjusting the temperature of the bearing casing by a jacket or drilled method.

[0004]

However, in the above method 1), the bearing 23 must be designed so that the clearance between the bearing 23 and the gear shaft 24 becomes appropriate according to the usage conditions of the resin and the gear pump. No, also the gear pump 22
However, there is a drawback that the amount of the lubricating resin changes and the proper amount of the lubricating resin cannot be obtained when the number of rotations of the item changes.

Further, the above method 2) has a drawback in that equipment costs for cooling, a temperature controller for a heating medium, a heat exchanger, piping, etc. are required.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and it is not necessary to newly manufacture a bearing even if the use conditions of a resin or a gear pump are changed, and a temperature controller for a cooling or heating medium or a heat exchanger is used. The purpose is to provide a gear pump that does not require equipment such as piping.

[0007]

A gear pump according to the present invention is a gear pump in which a bearing portion is lubricated with resin. Tapered portions corresponding to the gear shaft and the bearing forming the bearing portion are provided respectively, and the bearing has a gear shaft. It is characterized by being capable of reciprocating in the axial direction.

[0008]

In the gear pump of the present invention, the gear shaft and the bearing constituting the bearing are provided with corresponding taper portions, and the bearing can reciprocate in the axial direction of the gear shaft. This increases or decreases the clearance between the bearing and the gear shaft. By increasing or decreasing this gap, the amount of lubricating resin that lubricates the bearing portion and is discharged to the outside is adjusted to an appropriate amount of lubricating resin. This makes it possible to cope with changes in the usage conditions of the resin and the gear pump without manufacturing new bearings or the like.

[0009]

Embodiments of the gear pump of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an example of the gear pump of the present invention. In FIG. 1, 1 is a gear pump, 2 is a bearing of the gear pump 1, 3 is a gear shaft on which a gear (not shown) is mounted, and 4 is a casing of the bearing 2. Reference numeral 5 denotes a tapered portion of the bearing 2 having a groove-shaped inner peripheral surface formed in a taper, and 6 denotes a tapered portion of the gear shaft 3 having an outer peripheral surface formed in a taper. The tapered portion 5 and the tapered portion 6 are in phase with each other. It is formed in a corresponding taper. α is the taper angle of the taper portion 5, β is the taper angle of the taper portion 6, and α≈β. 7
Is a nut fixed to the bearing 2.

The bearing 2 is attached to the casing 4 by a slide key 8 so as to be capable of reciprocating in the axial direction of the gear shaft 3 (direction of arrow X), and the casing 4 is fixed to the side plate 9 with bolts.

Reference numeral 10 is a holding bolt of the bearing 2, 11 is a draw bolt, the hold bolt 10 passes through a bolt hole 12 of the bearing 2 and is screwed into a screw hole 13 of the casing 4, and the draw bolt 11 is screwed into the nut 7. Have been combined. H is a gap formed between the gear shaft 3 and the bearing 2.

When the clearance H is to be reduced, the presser bolt 10 is rotated to move the bearing 2 to the right in the direction of the arrow X, and when the clearance H is to be increased, the presser bolt 10 is loosened. , The drawing bolt 11 is rotated to move the bearing 2 to the left in the arrow X direction. As a result, even if the clearance H is increased or decreased and the bearing is not newly manufactured, the amount of the lubricating resin can be reduced by using the holding bolt 10 and the pulling bolt 11, for example, in the case of a resin such as a hard vinyl chloride resin which is greatly deteriorated by heat. Adjustment can be made by increasing the gap H to increase the amount of lubricating resin.

[0013]

Since the gear pump of the present invention is constructed as described above, the tapered bearing is reciprocated to increase or decrease the clearance between the bearing and the gear shaft, and the clearance is discharged to the outside through this clearance. It is possible to properly adjust the amount of lubricating resin of the bearing portion to be used. This makes it possible to properly adjust the amount of the lubricating resin in the bearing portion in response to changes in the usage conditions of the resin and the gear pump without manufacturing a new bearing or the like.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a gear pump of the present invention.

FIG. 2 is a perspective view showing a conventional gear pump.

[Explanation of symbols]

 1 Gear Bomb 2 Bearing 3 Gear Shaft 4 Casing 5, 6 Tapered Part 7 Nut 8 Slide Key 9 Side Plate 10 Holding Bolt 11 Removal Bolt 12 Bolt Hole 13 Screw Hole

Claims (1)

[Claims] 1. A gear pump in which a bearing portion is lubricated with resin, wherein tapered portions corresponding to the gear shaft and the bearing constituting the bearing portion are provided, respectively, and the bearing is capable of reciprocating in the axial direction of the gear shaft. Gear pump that is characterized by being.