JPH0114455B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is particularly applicable to radial bearings made of a multilayer material in which a sliding layer having low friction and wear resistance is adhered to a back metal such as steel. This relates to a bottomed cylindrical bearing that supports both loads and thrust loads.

[Prior art]

Conventionally, as a method for supporting both radial load and thrust load with a cylindrical bearing made of a multilayer material, a multilayer material 1 having a structure as shown in FIG. The sliding layer 3 is made of 1) a thin layer of low-friction synthetic resin adhered to a backing metal 2 made of a rolled steel plate or the like, and 2) a mixed woven fabric containing fluorine resin fibers attached. or, as shown in Fig. 8b, a multilayer material consisting of a back metal 2 such as a steel plate and a sintered alloy having self-lubricating properties as a sliding layer 3. As shown in FIG. 8c, a backing metal 2 is a steel plate with a porous sintered metal 2', and a sliding layer 3 is formed on the porous sintered metal 2' of the backing metal 2. 1) Synthetic resins such as fluororesins, 2) Solid lubricants such as molybdenum disulfide and graphite, 3) Soft metals such as lead, and 4) Impregnated and coated mixtures of these. As shown in FIG. 7, the multilayer material 1 is rolled into a cylindrical shape to form a cylindrical part 5 having a slit 4, and one end of the cylindrical part 5 is bent to provide an annular flange part 6, so-called flanged material. A cylindrical wound bearing 7 is formed, the bearing 7 is fitted into a housing 8 as shown in FIG. 6, and a radial load is supported by inserting the shaft 9 into the cylindrical portion 5. A method of supporting the thrust load by abutting the flange part 10 integrally provided with the flange part 6, or forming a step part instead of the flange part 10 at the end of the shaft 9, Mainly used is a method in which the flange 6 is brought into contact with the flange 6.

In the figure, numerals 11 and 11' are sealing materials that prevent foreign matter from entering the sliding surface.

However, in this method, sealing materials 11 and 11' that protect the sliding surfaces from foreign objects must be placed at both ends of the flanged cylindrical bearing 7, and the manufacturing of the shaft 9 is complicated and expensive; That is, the shaft 9 having the flange portion 10 must be manufactured by cutting out by machining or finishing the material obtained by forging, etc., which has the disadvantage that manufacturing is time-consuming. Since design values such as load capacity are determined by the support portion, the stepped portion has a diameter larger than necessary, resulting in high cost.

In view of these circumstances, the present applicant proposed in Utility Model Application No. 59-22494 a cylindrical bearing with a bottom formed by pressing and elongating processing as shown in FIG. 5 in order to support the thrust load at the end face of the shaft.

That is, a multi-layer material 3 consisting of a backing metal 1 and a sliding layer 2 deposited on the backing metal 1 is subjected to a press-stretching process in which the multi-layered material 3 is made to flow so that the sliding layer 2 is located on the inside. , a cylindrical part 12 without a slit, a bottom part 13 at one end of the cylindrical part 12, and an opening 14 at the other end.
A cylindrical bearing 15 with a bottom is formed, and the bearing 1
5 into the housing 8 and inserting the shaft 9, the radial load is supported by the cylindrical portion 12, and the thrust load is supported by bringing the end surface of the shaft 9 into contact with the bottom portion 13. It is a cylindrical bearing with a bottom.

However, while the bottomed cylindrical bearing 15 can solve the conventional drawbacks, since it does not have the sliding layer 2 on the end face of the opening 14, it wears out the sealing material 11 disposed in the opening 14. Bearing 1
There was a problem that reduced the lifespan of the 5.

Further, as a method for obtaining such a bottomed cylindrical bearing 15, there is a drawing method in which the multi-layer material 3 is squeezed, but in this method, the entire multi-layer material 3 is pushed into a die, so that the cylindrical portion 12 is If the length is increased, wrinkles are likely to occur in this portion, which is not desirable as a method of manufacturing the bearing 15.

[Problems to be solved by the present invention]

In view of the above-mentioned problems, the present invention uses a multi-layer material consisting of a backing metal and a sliding layer deposited on the backing metal. The present invention aims to provide a bottomed cylindrical bearing and a method for manufacturing the same, which prevent wear of the sealing material and extend the life of the bearing.

[Means for solving problems]

In order to solve the above problems, the present invention takes the following technical means.

That is, a multilayer material with a sliding layer adhered to a back metal such as steel is fixed on a die with a blank holder,
The multi-layer material is pressed with a punch from the back metal side using a variable pressure pad with a force smaller than the pressing force of the punch to form a bottomed cylindrical material consisting of a cylindrical part, a bottom part and an opening, and then Then, by punching the material along its outer diameter surface, a bottomed cylindrical bearing having sliding layers on the cylindrical portion, the inside of the bottom, and the end face of the opening is obtained.

[Effect]

In the present invention, a cylindrical material with a bottom is formed by press-stretching using a multilayer material, and the material is punched along its outer diameter surface, so that sliding can be applied to the cylindrical part, the inside of the bottom part, and the end face of the opening. Since a bottomed cylindrical bearing with a dynamic layer is obtained, it can support both radial load and thrust load, and it also prevents wear of the sealing material placed at the end of the opening, improving sealing performance over a long period of time. As a result, the life of the bearing can be improved.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the same components as those of the conventional bottomed cylindrical bearing will be described using the same prefixes.

Reference numeral 16 denotes a bottomed cylindrical bearing made of a multilayer material 1 consisting of a back metal 2 and a sliding layer 3 deposited on the back metal 2, as shown in FIG. a bottom portion 13 provided at one end of the cylindrical portion;
An opening 14 provided at the other end, and a bottom 1
3 has its center portion projected toward the opening 14 side.

This prevents the corner 17 of the bottom portion 13 from coming into contact with the end of the shaft and obstructing smooth sliding between the shaft end surface and the bottom portion 13, since the corner 17 of the bottom portion 13 is slightly curved due to manufacturing. It is done for the sake of

Further, the sliding layer 3 is formed on the inner side of the cylindrical portion 12, the bottom portion 13, and the end surface 18 of the opening portion 14.

FIG. 2 shows a bottomed cylindrical bearing 16 of another embodiment.

In this embodiment, the bottom portion 13 is made flat without protruding toward the opening 14 side.

In such an embodiment, the shaft end is chamfered to be larger than the curved corner 17 of the bottom 13 so that the end surface of the shaft and the bottom 13 slide smoothly. A method is adopted to prevent contact between the two.

The bottomed cylindrical bearing 16 configured in this way is
As shown in FIG. 3, after the housing 8 is fitted, the thrust load is smoothly supported by the end face of the shaft 9 and the bottom part 13, and the radial load is smoothly supported by the sliding movement of the outer peripheral surface of the shaft 9 and the cylindrical part 12. At the same time, since the end face 18 of the opening has the sliding layer 3, the sealing material 11 disposed at the end of the opening 14 slides on the sliding layer 3 to prevent its wear and maintain sealing performance over a long period of time. In addition, the life of the bearing can be improved.

Next, the method for manufacturing the bottomed cylindrical bearing of the present invention will be explained in detail with reference to FIG.

That is, the bottomed cylindrical bearing 16 of the present invention has a multilayer material 1 in which a sliding layer 3 is adhered to a back metal 2 such as steel.
is held by a lower mold holder S, and has a hole 19 of a predetermined diameter (the outer diameter of the bearing) in the center thereof, and a die 20 that is fitted into the hole 19 of the die and is connected to a press drive source or separately provided. A variable pressure pad 21 that also serves as a knock-out whose pressurizing force is variably controlled according to the material of the multilayer material 1 by a pressurizing device K consisting of a cylinder connected to a drive source, and an upper mold holder (not shown) are used. ) and a blank holder 23 controlled by a pressing device O consisting of a punch 22 of a predetermined diameter (the inner diameter of the bearing) and a cylinder connected to a press drive source or a separately provided drive source. The sliding layer 3 is placed upwardly on the die 20 of the mold, so-called punch 2.
Place it on the 2nd side [see Figure 4a].

Next, the pressing device O is activated (in the direction of arrow G in the figure) to press the multilayer material 1 into the die 2 using the blank holder 23.
0, and in this state, actuate the pressure device K from the back metal 2 side of the multilayer material 1 to press the variable pressure pad 21.
Press with a force smaller than the pressing force of the punch 22 (in the direction of arrow F in the figure), lower the punch 22 (in the direction of arrow E in the figure), and push out the multilayer material 1.
As the pressure variable pad 21 is lowered (in the direction of arrow H in the figure), the extruded portion is stretched to a predetermined depth (length) by pressing and stretching the cylindrical portion and the bottom portion. A bottomed cylindrical material 24 having a sliding layer 3 on the inner side and the end face of the opening is formed (see FIGS. 4b and 4c).

Next, the bottomed cylindrical material 24 is lifted up the punch 22 and the blank holder 23 (arrow G' in the figure,
E' direction) to separate it from the multilayer material 1 and the material 24, and then raise the pressure variable pad 21 (in the direction of arrow H' in the figure) and push it out from the die 20 (see Figure 4 d).

Next, the bottomed cylindrical material 24 is held by a lower die holder (not shown), and a punch 27 is held by a punching die 26 having a hole 25 of a predetermined diameter (material diameter) and an upper die holder (not shown). Hole 2 of a punching die of a mold consisting of a blank holder 28 and
5, and fix it to the die 26 with the blank holder 28 (in the direction of arrow J in the figure) [Figure 4 e
reference〕.

After that, the bottomed cylindrical material 24 is punched (trimmed) along its outer diameter surface by lowering the punch 27 (in the direction of arrow L in the figure), and is passed through a sizing die 29 as necessary. This is what you get.

〔Effect of the invention〕

By adopting the above-mentioned means, the present invention has the following effects.

That is, by fixing the multilayer material on a die, pressing and elongating it into a cylindrical shape with a bottom, and then punching it along its outer diameter to form a cylindrical bearing with a bottom, 1) A sliding layer is provided on the inside of the cylindrical part, the bottom part, and the end face of the opening. 2) Radial loads and thrust loads can be supported without special means of providing a flange or step on the shaft. 3 ) By providing a sliding layer on the end face of the opening,
It is possible to prevent abrasion of the sealing material disposed at the end of the opening, and by preventing abrasion of the sealing material, the sealing performance and the life of the bearing can be improved. 4) Pressure extension to form a cylindrical part by flowing the material. Compared to the conventional drawing process in which the material is squeezed (squeezed), this process is easier to manufacture and more economical, as it can prevent wrinkles from forming in the cylindrical part even if it is made longer. It has great effects.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a bottomed cylindrical bearing of the present invention, FIG. 2 is a sectional view showing a bottomed cylindrical bearing of another embodiment of the invention, and FIG. 3 is a sectional view showing a bottomed cylindrical bearing of the present invention. 4 is an explanatory diagram showing the manufacturing process of the bottomed cylindrical bearing of the present invention. FIG. 5 is a sectional view showing the conventional bottomed cylindrical bearing and its usage. 6 and 7 are cross-sectional views showing a conventional flanged cylindrical bearing and how it is used, and FIG. 8 is a partially enlarged cross-sectional view showing the structure of a multilayer material. 1: Multilayer material, 2: Backing metal, 3: Sliding layer, 12: Cylindrical part, 13: Bottom part, 14: Opening part, 16: Cylindrical bearing with bottom, 18: Opening end face, 20: Die, 2
1: Pressure variable pad, 22, 27: Punch, 2
3, 28: blank holder, 24: cylindrical material with bottom, 26: punching die.

Claims (1)

[Scope of Claims] 1. A cylindrical bearing with a bottom, which has a cylindrical portion, a bottom at one end of the cylindrical portion, and an opening at the other end. 1. A cylindrical bearing with a bottom, comprising a multi-layered material and having the sliding layer on the inner side of the cylindrical part and the bottom part, and on the end face of the opening. 2. A multilayer material with a sliding layer adhered to a backing metal such as steel is slid onto the die of a mold consisting of a die, a variable pressure pad that also serves as a knockout fitted to the die, a punch, and a blank holder. The step of placing the multilayer material with the dynamic layer facing upward, fixing the multilayer material on the die with a blank holder, pressing it from the backing metal side with a variable pressure pad with a force smaller than the pressing force of the punch, and in this state, pressing the punch. The cylindrical part is lowered and subjected to pressure elongation processing,
The process of forming a bottomed cylindrical material consisting of a bottom and an opening, raising the punch and blank holder, extracting the material from the die using a variable pressure pad, and then punching out a mold consisting of the punching die, punch and blank holder. The cylindrical material with the bottom inserted into the punching die is fixed with a blank holder, and in this state, punching is performed along the outer diameter surface of the material with a punch to form the cylindrical part and the bottom part. 1. A method for manufacturing a cylindrical bottomed bearing, comprising the steps of: forming a cylindrical bottomed bearing having a sliding layer on the inner side and on the end face of the opening.