Raceway ring member for bearing unit, bearing unit, and method and device for producing raceway ring member for bearing unit
A technology of ring parts and raceways, which is applied in the field of manufacturing bearing unit raceway ring parts, and can solve problems such as processing costs
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no. 1 example
[0206] First, refer to figure 1 and figure 2 A bearing unit according to a first embodiment of the present invention is described. The bearing unit of this embodiment is a pair of Figure 16 The improvement of the bearing unit shown in (a), 16(b), therefore, only the different structure is described, and the description of the similar structure is omitted.
[0207] In the bearing unit of this embodiment, the outer ring (one raceway ring) 2 and the bush main body 12 (the raceway ring member constituting the other raceway ring) are formed by cold forging. Here, will refer to figure 1 Processing for forming the bush main body 12 by cold forging is described.
[0208] First, if figure 1 As shown in (a), as a material for forming the bush main body 12, a cylindrical billet 20 made of machine structural carbon steel (JISG4051) was prepared in which the material was spheroidized. It should be noted that although the billet 20 is a solid material here, since the bushing main ...
no. 2 example
[0234] Below, will refer to image 3 and Figure 5 A bearing unit according to a second embodiment of the present invention is described. It should be noted that since the bearing unit of this embodiment is also Figure 16 The improvement of the bearing unit shown in (a), 16(b), therefore, only the different structure will be described below, and the description of the same structure will be omitted.
[0235] In the bearing units shown in 16(a) and 16(b), in order to increase the strength of the root of the mounting flange 12a to a certain extent, the bushing main body 12 is set to substantially the same (constant) hardness as a whole, so The clamping area (shaft end portion) 12c of the bush main body 12 is made difficult to be plastically deformed.
[0236] Thus, in the bearing unit of this embodiment, the clamping area 12c ( image 3 (a) and 3(b)) are easily plastically deformed so that the inner ring 16 can be locked to the lining with good efficiency by clamping (in tig...
no. 3 example
[0263] Below, will refer to Figure 6 to Figure 9 A bearing unit according to a third embodiment of the present invention is described. This embodiment is intended to manufacture a structure for the aforementioned Figure 9 The bushing main body (the other raceway ring part) 113a of the wheel support unit of the driven wheel is shown. In addition, although Figure 8 Shows the state in which side extrusion processing is performed, but in Figure 8 In , the right half shows the state immediately before starting machining, and the left half shows the state just after finishing machining.
[0264] In order to manufacture the bushing main body 113a with the manufacturing method of this embodiment, first, the Image 6 The cylindrical material 150 shown in (a) is extruded forward in the first stage so as to obtain Image 6 The stepped first intermediate material 131 shown in (b). Forward extrusion, which is one of the cold plastic forming methods, is accomplished by pushing the...
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