JPH0615009Y2 - Reducer for extruder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a reducer for an extruder having a lubricating structure.

(Prior Art) FIG. 2 shows a conventional lubricating structure of a reducer for an extruder. In the figure, reference numeral 1 denotes a screw, a drive shaft 3 is provided on the rear side of the screw, and an auxiliary drive shaft 4 having a smaller diameter than the drive shaft 3 is also provided on the rear side. 5 is a hollow shaft, into which the drive shaft 3 and the auxiliary drive shaft 4 are inserted,
A key 6 is provided between the drive shaft 3 and the drive shaft 3, and the drive shaft 3 is a hollow shaft 5
Although it can rotate integrally with the hollow shaft 5, it can move in the axial direction separately from the hollow shaft 5. 7 is a bearing box, and a cylinder 8
Is fixed to the gear box 14 with bolts 15, and both ends of the hollow shaft 5 are rotatably supported by bearings 10 and 18. 12 is a gear key 13
It is fixed to the hollow shaft 5 via a pinion 26, and rotation is transmitted from an electric motor (not shown) through the mating pinion 26 and the like. The pinion 26 is rotatably supported by the gear box 14 by a bearing (not shown). 11 is a thrust bearing, and the thrust load due to the resin pressure generated at the tip of the screw 1 during operation is
It is transmitted to the hollow shaft 5 via a cap nut 19 described later, and is received by a thrust bearing 11.

The cap nut 19 is screwed into a male screw at the rear end of the hollow shaft 5 and is in contact with the rear end surface of the auxiliary drive shaft 4. Reference numeral 20 denotes a stud bolt which is screwed into a male screw at the rear end portion of the auxiliary drive shaft 4 and is loosely fitted in the through hole 21 of the cap nut 19, and further the jam nut 22
It is screwed to. A groove 24 is provided in the cylinder 8 corresponding to the ring valve 3 of the screw 1, and adjusts the resin flow by the axial movement of the screw 1. 27 is a bearing arranged in the bearing housing 7.
Lubricating oil intake hole for lubricating 10 and thrust bearing 11, 28 is a lubricating oil discharge hole provided on the outer periphery of bearing box 7, and the lubricating oil supplied from lubricating oil intake hole 27 to bearing box 7 is the same. It is continuously recirculated from the lubricating oil discharge hole 28 through the return pipe 29 into the gear box 14.

(Problems to be solved by the invention) However, in the conventional lubrication structure shown in FIG. 2, the lubricating oil return pipe 29 is arranged outside the speed reducer, and is easily damaged by human or other reasons. Moreover, since this kind of piping is usually composed of a plurality of parts, there is a high possibility of oil leakage. Therefore, the conventional structure has low reliability in terms of lubrication management. Further, since the return pipe is externally arranged, the number of parts is increased, and processing and assembling work for attaching the parts are required, which causes a problem of high cost.

The present invention provides a reduction gear for an extruder that can solve the conventional problems by eliminating the conventional lubricating oil return pipe and adding a function to replace it in the bearing box.

(Means for Solving the Problem) For this reason, the present invention provides a reduction gear for an extruder, which comprises a bearing box and a gear box supporting a hollow shaft that rotates integrally with a screw drive shaft through a bearing and a thrust bearing. An oil groove is provided in a portion of the bearing box and the gear box facing the thrust bearing, and a part of the rolling element of the bearing and the thrust bearing is oil bath lubricable between the outer circumference of the hollow shaft and the gear box. And an opening communicating with the oil groove is provided, which serves as a means for solving the problem.

(Operation) Lubricating oil supplied from the lubricating oil intake hole into the bearing box lubricates the bearings and thrust bearings to cool them, and then passes through the gaps or oil grooves in the thrust bearings to form the gearbox and hollow shaft. Overflow into the gear box through the opening provided between them and discharge. Even when the supply of the lubricating oil from the lubricating oil intake hole is stopped, the dimensions of the opening are such that some of the rolling elements of the bearing can be lubricated with an oil bath, so the lubrication of the bearing and thrust bearing Is not a sudden problem.

(Embodiment) The present invention will be described below with reference to an embodiment of the drawings. FIG. 1 shows an embodiment of the present invention. In FIG. 1, reference numeral 1
Since members 27 to 27 are the same as those shown in FIG. 2,
Here, detailed description of these configurations and operations will be omitted.

Referring to FIG. 1 for the points different from FIG. 2, reference numerals 31 and 32 respectively designate a single row having an appropriate width, which is arranged at a position facing the thrust bearing 11 of the bearing box 7 and the gear box 14, respectively. To several grooves, usually assembled so that they are on the lower side when installed. Further, 33 is an opening formed between the gear box 14 and the hollow shaft 5, and the inner diameter D thereof is determined so that a part of the rolling elements of the bearing 10 and the thrust bearing 11 can be lubricated with an oil bath. .

Next, the operation of the embodiment configured as described above will be described. The lubricating oil supplied from the lubricating oil intake hole 27 into the bearing housing 7 lubricates the bearing 10 and the thrust bearing 11 to remove generated heat. After the cooling action, the oil is overflowed into the gear box 14 through an opening 33 provided between the gear box 14 and the hollow shaft 5 through the gap of the thrust bearing 11 or the oil grooves 31 and 32. Further, the dimension D of the opening 33 is determined such that a part of the rolling elements of the bearing and the thrust bearing can be lubricated with an oil bath, so that the supply of the lubricating oil from the lubricating oil intake hole 27 is stopped for some reason. Even if bearing 10 and thrust bearing 11
Lubrication is not a sudden problem.

(Effects of the Invention) The present invention is configured as described above in detail, and the drainage means of the lubricating oil supplied into the bearing box is installed inside the speed reducer by stopping the external piping of the conventional speed reducer. Since it has a function, is easily damaged, and does not use the conventional external piping composed of a plurality of parts, the reliability of lubrication management can be improved. Even if the supply of lubricating oil into the bearing box is stopped for some reason, the opening in the gear box ensures the oil level in the bearing box for lubricating the bearings and thrust bearings. Lubrication management reliability is improved. Furthermore, since there is no external piping, it is possible to omit processing and assembling work for installing this.

[Brief description of drawings]

FIG. 1 is a side sectional view of an extruder speed reducer showing an embodiment of the present invention, and FIG. 2 is a side sectional view of a conventional extruder speed reducer. Description of the main parts of the figure 1 ... Screw, 3 ... Drive shaft 4 ... Sub drive shaft, 5 ... Hollow shaft 7 ... Bearing box, 10 ... Bearing 11 ... Thrust bearing, 12 ... Gear 14 ... … Gearbox 27 …… Lubricating oil intake hole 31,32 …… Oil groove 33 …… Opening

Claims (1)

[Scope of utility model registration request] 1. A reducer for an extruder, comprising a bearing box and a gear box supporting a hollow shaft that rotates integrally with a screw drive shaft through the bearing and the thrust bearing, and a thrust bearing of the bearing box and the gear box. An oil groove is provided in the contacting portion, and an opening is formed between the outer circumference of the hollow shaft and the gear box so that a part of the rolling element of the bearing and the thrust bearing can be lubricated with an oil bath and communicates with the oil groove. A speed reducer for an extruder, which is provided with a section.